Water Properties Labs And Lab Notes: Quiz

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Water Properties Labs And Lab Notes: Quiz - Quiz

Water Properties Labs: Quiz


Questions and Answers
  • 1. 

    What is adhesion?

    • A.

      Waters ability to stick to other materials

    • B.

      Waters ability to stick to itself

    • C.

      Covalent bonds in water

    • D.

      Capillary Action

    Correct Answer
    A. Waters ability to stick to other materials
    Explanation
    Adhesion refers to water's ability to stick to other materials. This property is due to the cohesive forces between water molecules and the molecules of other substances. When water comes into contact with a different material, such as glass or paper, the water molecules adhere to the surface of that material. This adhesion allows water to spread out and wet the surface, forming droplets or creating capillary action.

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  • 2. 

       The water and air pressure lab:If the lab were done while climbing Mt. Everest, as altitude increases what happens?

    • A.

      As altitude increases, air becomes less dense and the air pressure decreases. The water would not shoot out of the container.

    • B.

      As altitude increases, air becomes more dense and the air pressure decreases. The water would not shoot out of the container.

    • C.

      As altitude increases, air becomes more dense and the air pressure increases. The water would shoot out of the container farther than in the classroom.

    • D.

      As altitude increases, air becomes less dense and the air pressure increases. The water would shoot out of the container farther than in the classroom.

    Correct Answer
    A. As altitude increases, air becomes less dense and the air pressure decreases. The water would not shoot out of the container.
    Explanation
    As altitude increases, the air becomes less dense because there is less atmospheric pressure pushing down on it. This decrease in air density also leads to a decrease in air pressure. Since the water in the container is subjected to the surrounding air pressure, which is now lower, it would not shoot out of the container. This is because there is less force pushing the water out due to the decreased air pressure at higher altitudes.

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  • 3. 

    Think about Mt. Everest. Complete this statement: As altitude increases, air becomes.......

    • A.

      less dense, decreasing atmospheric pressure.

    • B.

      More dense, increasing atmospheric pressure.

    • C.

      less dense, increasing atmospheric pressure.

    • D.

      More dense, decreasing atmospheric pressure.

    Correct Answer
    A. less dense, decreasing atmospheric pressure.
    Explanation
    As altitude increases, the air becomes less dense because the air molecules are more spread out. This decrease in density leads to a decrease in atmospheric pressure. At higher altitudes, there is less air above, exerting less pressure on the surroundings. This is why climbers and pilots at high altitudes may experience difficulty breathing due to the reduced amount of oxygen in the air.

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  • 4. 

    What did Ben Franklin's experiment with a non polar oil substance accurately measure?

    • A.

      Ben Franklin accurately measured the thickness of a single-molecule thick layer of olive oil on water.

    • B.

      Ben Franklin accurately measured the pollution in the pond water caused by the olive oil.

    • C.

      Ben Franklin accurately measured the change in surface tension when olive oil was added to the pond.

    • D.

      Ben Franklin accurately measured the area of underwater visibility created by altered surface tension when oil was added to water.

    Correct Answer
    A. Ben Franklin accurately measured the thickness of a single-molecule thick layer of olive oil on water.
    Explanation
    Ben Franklin's experiment accurately measured the thickness of a single-molecule thick layer of olive oil on water. This means that he was able to determine the exact thickness of the layer of oil molecules on the surface of the water. This measurement is significant because it provides insight into the behavior of oil on water and can be used to understand various phenomena related to surface tension and the interaction between oil and water.

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  • 5. 

    Which force of water is capillary action related to?

    • A.

      Adhesion

    • B.

      Cohesion

    • C.

      Surface Tension

    • D.

      Polarity

    Correct Answer
    A. Adhesion
    Explanation
    Capillary action is the phenomenon where water is drawn up into narrow spaces or tubes against the force of gravity. It occurs due to the adhesive forces between the water molecules and the walls of the tube or surface it is in contact with. Adhesion refers to the attraction between molecules of different substances, in this case, water and the tube or surface. Therefore, capillary action is related to adhesion.

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  • 6. 

    Celery test: What property of water does the celery test model?

    • A.

      Capillary Action

    • B.

      Polarity

    • C.

      Surface Tension

    • D.

      Specific Heat

    Correct Answer
    A. Capillary Action
    Explanation
    The celery test models capillary action. Capillary action is the ability of a liquid to flow in narrow spaces against the force of gravity. In the celery test, when celery stalks are placed in a glass of water, the water is drawn up through the tiny tubes in the celery, demonstrating capillary action. This property of water allows it to move against gravity and be transported through narrow channels, such as in plants or paper towels.

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  • 7. 

    Choose the correct term to fill in the blank.The Earth's __________ pulls on air, and this pull, or "pressure" of air, is called atmospheric pressure.

    • A.

      Gravity

    • B.

      Density

    • C.

      Volume

    • D.

      Air Pressure

    Correct Answer
    A. Gravity
    Explanation
    Gravity is the force that pulls objects towards the center of the Earth. In the context of the question, gravity pulls on the air molecules, creating a pressure known as atmospheric pressure. This pressure is responsible for various weather phenomena and the distribution of air around the Earth. Density refers to the mass of a substance per unit volume, volume is the amount of space occupied by an object, and air pressure is the result of the Earth's gravity acting on the air.

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  • 8. 

    In the water pressure lab:What do you predict would happen to the water coming out of the container if the container holes were larger? 

    • A.

      If the holes were larger, the volume of water flowing is greater, but slower with less pressure.

    • B.

      If the holes were larger, the volume of water flowing is less, but faster with more pressure.

    • C.

      If the holes were larger, the volume of water flowing is greater, faster and with more pressure.

    • D.

      If the holes were larger, the volume of water flowing is greater, faster and with less pressure.

    Correct Answer
    A. If the holes were larger, the volume of water flowing is greater, but slower with less pressure.
    Explanation
    If the holes in the container were larger, it would allow more water to flow out of the container. However, because the holes are larger, the water would flow at a slower rate. This is because the larger holes would result in a decrease in pressure, causing the water to flow with less force. Therefore, if the holes were larger, the volume of water flowing would be greater, but the flow rate would be slower, and the pressure would be less.

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  • 9. 

    In the water pressure labs:What would you predict about the water coming out of the container if the container holes were made smaller? 

    • A.

      Water comes out of the container faster, is under greater pressure and there is less volume of water in the flow.

    • B.

      Water comes out of the container faster, is under less pressure and there is greater volume of water in the flow.

    • C.

      Water comes out of the container slower, is under greater pressure and there is less volume of water in the flow.

    • D.

      Water comes out of the container slower, is under less pressure and there is less volume of water in the flow.

    Correct Answer
    A. Water comes out of the container faster, is under greater pressure and there is less volume of water in the flow.
    Explanation
    If the holes in the container are made smaller, the water will come out of the container faster because the smaller holes create a higher velocity for the water to flow through. Additionally, the water will be under greater pressure because the smaller holes create more resistance, causing the pressure to build up. Lastly, there will be less volume of water in the flow because the smaller holes restrict the amount of water that can pass through at a given time.

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  • 10. 

    What does the 'Follow the String' activity demonstrate?

    • A.

      Cohesion and adhesion.

    • B.

      Surface tension and adhesion.

    • C.

      Cohesion and capillary action.

    • D.

      Adhesion and capillary action.

    Correct Answer
    A. Cohesion and adhesion.
    Explanation
    The "Follow the String" activity demonstrates both cohesion and adhesion. Cohesion refers to the attraction between molecules of the same substance, while adhesion refers to the attraction between molecules of different substances. In this activity, the string is able to "follow" the water because the water molecules stick together (cohesion) and also stick to the surface of the string (adhesion). Therefore, both cohesion and adhesion are demonstrated in this activity.

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  • 11. 

    Water Pressure Lab: Observe these containers:Identify: when is the bottle of water under the greatest pressure?

    • A.

      Bottle with the cap off

    • B.

      Bottle with the cap-on

    • C.

      Cap-on, bottle with the narrowest opening

    • D.

      Cap-on, bottle with the widest opening

    Correct Answer
    A. Bottle with the cap off
    Explanation
    When the cap is off, the bottle of water is under the greatest pressure. This is because the cap restricts the flow of water out of the bottle, causing the pressure to build up inside. When the cap is off, the water can freely flow out of the bottle, reducing the pressure inside.

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  • 12. 

    In the water pressure lab, of the two containers and three holes:Which container and which container hole had the least amount of water coming out when the hole was un-taped? 

    • A.

      Capped, top hole

    • B.

      Uncapped, top hole

    • C.

      Uncapped, middle hole

    • D.

      Capped, middle hole

    Correct Answer
    A. Capped, top hole
    Explanation
    The correct answer is "Capped, top hole." In the water pressure lab, when the hole is un-taped, the container with the top hole that is capped will have the least amount of water coming out. This is because the cap prevents the water from flowing freely through the hole, resulting in a lower amount of water coming out compared to the other holes.

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  • 13. 

    Identify the property of water represented in this diagram:

    • A.

      Capillary Action

    • B.

      Polarity

    • C.

      Universal solvency

    • D.

      Surface tension

    Correct Answer
    A. Capillary Action
    Explanation
    The diagram represents capillary action, which is the ability of water to move against gravity in narrow spaces, such as in a thin tube or through the fibers of a plant. This property is due to the cohesive forces between water molecules and the adhesive forces between water and the surface of the tube or plant. As a result, water is able to rise in the tube or move through the plant's vascular system.

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  • 14. 

    This image shows two soda bottle streams Look at this image to answer the question below. Soda bottle stream lab: The soda bottle has vertical cuts for the water to pour out. As the water exits the bottle it forms two individual streams.  Identify what causes the two streams with each pinch of your fingers to combine and flow as one stream of water.

    • A.

      With each pinch of your fingers, cohesion causes the two streams of water to combine and flow as one stream of water.

    • B.

      Adhesion causes the streams of water to combine with each pinch of your fingers to combine and flow as one stream of water.

    • C.

      Polarity causes the streams of water to combine with each pinch of your fingers to combine and flow as one stream of water.

    • D.

      Surface tension causes the streams of water to combine with each pinch of your fingers to combine and flow as one stream of water.

    Correct Answer
    A. With each pinch of your fingers, cohesion causes the two streams of water to combine and flow as one stream of water.
    Explanation
    With each pinch of your fingers, cohesion causes the two streams of water to combine and flow as one stream of water. Cohesion is the attraction between molecules of the same substance, in this case, water. The water molecules are attracted to each other and stick together, allowing the two streams to merge into one.

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  • 15. 

    What is wicking?

    • A.

      A material that pulls moisture through by capillary action

    • B.

      Adhesion of water

    • C.

      Cohesion of water

    • D.

      Capillary Action of water

    Correct Answer
    A. A material that pulls moisture through by capillary action
    Explanation
    Wicking refers to the process in which a material draws moisture through by capillary action. Capillary action is the ability of a liquid to flow against gravity in a narrow space, such as through the tiny gaps between fibers in a fabric. When a material has good wicking properties, it can effectively absorb and transport moisture away from the surface, keeping the area dry and comfortable. This is commonly seen in clothing and textiles designed for sports or outdoor activities, where moisture management is crucial for maintaining comfort and preventing moisture-related issues such as sweat buildup or dampness.

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  • 16. 

    Identify what causes water to form drops.

    • A.

      Cohesion 

    • B.

      Polarity

    • C.

      Capillary action

    • D.

      Specific heat

    • E.

      Adhesion

    Correct Answer
    A. Cohesion 
    Explanation
    Cohesion is the force that holds water molecules together. This force is responsible for the formation of water drops. When water molecules are attracted to each other due to cohesion, they form surface tension, causing the water to gather and form droplets. Therefore, cohesion is the reason behind the formation of water drops.

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  • 17. 

    A meniscus formed in a graduated cylinder is caused by and an example of what characteristic of water?

    • A.

      Adhesion

    • B.

      Cohesion

    • C.

      Surface Tension

    • D.

      Capillary Action

    Correct Answer
    A. Adhesion
    Explanation
    The meniscus formed in a graduated cylinder is caused by adhesion. Adhesion refers to the attraction between molecules of different substances. In this case, the water molecules are attracted to the walls of the graduated cylinder, causing them to climb up the sides and form a concave shape. This phenomenon is a result of the adhesive forces between the water molecules and the glass surface of the cylinder.

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  • 18. 

    Identify which property of water allows water to move against gravity.

    • A.

      Capillary Action allows water to move against gravity.

    • B.

      Surface tension allows water to move against gravity.

    • C.

      Cohesion allows water to move against gravity.

    • D.

      Universal solvency allows water to move against gravity.

    Correct Answer
    A. Capillary Action allows water to move against gravity.
    Explanation
    Capillary action is the property of water that allows it to move against gravity. This phenomenon occurs due to the combination of cohesion and adhesion. Cohesion is the attraction between water molecules, causing them to stick together. Adhesion is the attraction between water molecules and other substances, such as the walls of a narrow tube. In capillary action, water molecules adhere to the walls of a narrow tube, and cohesion pulls other water molecules along, allowing water to move against gravity. Surface tension, on the other hand, is the force that causes the surface of a liquid to behave like a stretched elastic sheet, but it does not directly allow water to move against gravity. Universal solvency refers to water's ability to dissolve a wide range of substances and is not related to its ability to move against gravity.

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  • 19. 

    Look at the diagram of capillary action in the tubes.  Why does the water rise at different levels in each tube?

    • A.

      Capillary action causes the water to rise at different levels in the tubes because the rise depends on the diameter of the tube. The smaller the tube diameter the greater the rise of the water column in the tube.

    • B.

      Capillary action causes the water to rise at different levels in the tubes because the rise depends on the surface tension within the tube.

    • C.

      Capillary action causes the water to rise at different levels in the tubes because the rise depends on the pull of gravity on the tube.

    • D.

      Capillary action causes the water to rise at different levels in the tubes because the rise depends on the cohesion of adhered water to and among other water molecules to the surface.

    Correct Answer
    A. Capillary action causes the water to rise at different levels in the tubes because the rise depends on the diameter of the tube. The smaller the tube diameter the greater the rise of the water column in the tube.
    Explanation
    The explanation for the given answer is that capillary action is the phenomenon in which liquids are pulled upward against gravity in narrow tubes or channels. This is due to the cohesive forces between the liquid molecules and the adhesive forces between the liquid and the tube's surface. In the case of water rising in capillary tubes, the rise of the water column depends on the diameter of the tube. The smaller the diameter, the greater the rise of the water column because the cohesive forces are stronger, allowing the water to overcome gravity and climb higher in the tube.

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  • 20. 

    What caused the water to climb higher on the paper towel than the oil?

    • A.

      The water climbs higher than the oil on the paper towel because oil is non-polar and its molecules don't easily cohere. Water has polar molecules that cohere to one another and adhere to surface of the paper towel allowing it to climb and pull other water molecules along.

    • B.

      The water climbs higher than the oil on the paper towel because oil is polar and does not attract to the paper towel which is non-polar. Water's non-polar molecules adhere to the paper towel.

    • C.

      The water climbs higher than the oil on the paper towel because oil is non-polar, its molecules cohere tightly to each other and and do not want to adhere to the polar paper towel.

    • D.

      The water climbs higher than the oil on the paper towel because the oil is hydrophilic and repels the paper towel.

    Correct Answer
    A. The water climbs higher than the oil on the paper towel because oil is non-polar and its molecules don't easily cohere. Water has polar molecules that cohere to one another and adhere to surface of the paper towel allowing it to climb and pull other water molecules along.
    Explanation
    The correct answer is that water climbs higher than oil on a paper towel because oil is non-polar and its molecules do not easily stick together. On the other hand, water has polar molecules that attract and stick to each other, as well as to the surface of the paper towel. This cohesive and adhesive property of water allows it to climb and pull other water molecules along, resulting in a higher climb compared to oil.

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  • 21. 

    This image shows two soda bottle streams Look at this image to answer the question below. Soda bottle stream lab: The soda bottle has vertical cuts for the water to pour out. As the water exits the bottle it forms two individual streams.  Identify what causes each swipe of your hand to separate and flow as two separate streams of water.

    • A.

      Cohesion causes the streams of water to separate with each swipe of the finger flowing as two separate streams of water.

    • B.

      Adhesion causes the stream of water to separate with each swipe of the hand flowing as two separate streams of water.

    • C.

      Polarity causes the streams of water to separate with each swipe of the fingers.

    • D.

      Surface tension causes the streams of water to combine with each pinch of your fingers to combine and flow as two separate streams of water.

    Correct Answer
    B. Adhesion causes the stream of water to separate with each swipe of the hand flowing as two separate streams of water.
    Explanation
    Adhesion is the attraction between molecules of different substances. In this case, it refers to the attraction between the water molecules and the surface of the soda bottle. When the water exits the bottle, it adheres to the surface and is pulled in different directions, causing it to separate into two streams. This is why each swipe of the hand causes the water to flow as two separate streams.

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  • 22. 

    Wicking Paper Towel Rope:How does water flow from cup A to cup B?

    • A.

      Water flows from cup A to cup B by capillary action.

    • B.

      Water flows from cup A to cup B by surface tension.

    • C.

      Water flows from cup A to cup B by polarity.

    • D.

      Water flows from cup A to cup B by gravity.

    Correct Answer
    A. Water flows from cup A to cup B by capillary action.
    Explanation
    Capillary action is the process by which water is able to flow against gravity in narrow spaces, such as the fibers of a paper towel rope. This occurs due to the cohesive forces between water molecules, which allows them to "stick" together and move as a continuous column. As the water molecules are drawn into the small spaces between the fibers, they pull other water molecules along, resulting in the flow of water from cup A to cup B. Surface tension and polarity also play a role in capillary action, but the main driving force is the cohesive forces between water molecules. Gravity, on the other hand, would cause water to flow downward, not upward against gravity.

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  • 23. 

    Wicking Paper Towel Rope How does cohesion and adhesion cause the paper towel to wick the water from cup A to cup B?

    • A.

      The paper towel rope acts as a wick causing the cohesive water molecules to follow each other through the tiny gaps in the fabric of the paper towel. The adhesive force between the paper towel rope and the water is stronger than the cohesive forces of the water molecules helping the water to move up the paper towel rope.

    • B.

      The paper towel rope acts as a wick causing the adhesive water molecules to follow each other through the tiny gaps in the fabric of the paper towel. The cohesive force between the paper towel rope and the water is stronger than the adhesive forces of the water molecules helping the water to move up the paper towel rope.

    • C.

      The paper towel rope wick is twisted into a spiral which causes the water to adhere to itself and pull itself up from cup A to cup B.

    • D.

      The paper towel rope wick breaks the surface tension of the water causing it to adhere to it and climb against gravity.

    Correct Answer
    A. The paper towel rope acts as a wick causing the cohesive water molecules to follow each other through the tiny gaps in the fabric of the paper towel. The adhesive force between the paper towel rope and the water is stronger than the cohesive forces of the water molecules helping the water to move up the paper towel rope.
    Explanation
    The correct answer explains that the paper towel rope acts as a wick, allowing the cohesive water molecules to move through the tiny gaps in the fabric of the paper towel. The adhesive force between the paper towel rope and the water is stronger than the cohesive forces of the water molecules, which helps the water to be pulled up the paper towel rope. This explanation highlights the role of cohesion and adhesion in allowing the water to be transported from cup A to cup B.

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  • 24. 

    Wicking Paper Towel Rope Lab groups chose different food colorings for their water. Some groups noticed that the food coloring in cup A did not transfer to cup B.Their cup B had a different color. What caused the food coloring change from cup A to cup B?

    • A.

      Some food coloring color pigments (purple for example) separated from the water and brokedown to its basic components while being wicked by the paper towel. Those colors (like purple) did not transfer but their base colors did transfer.

    • B.

      Some food coloring color pigments (purple for example) absorbed the color from the paper towel rope. This added to its basic color components and transferred a different color.

    • C.

      Some food coloring color pigments (purple for example) reflected the color of the paper towel rope. This caused the color that was transferred to be brighter.

    • D.

      Some food coloring color pigments (purple for example) were left behind completely causing the water in cup A to be purple and the water in cup B to be clear.

    Correct Answer
    A. Some food coloring color pigments (purple for example) separated from the water and brokedown to its basic components while being wicked by the paper towel. Those colors (like purple) did not transfer but their base colors did transfer.
    Explanation
    When the food coloring is wicked by the paper towel, some color pigments (such as purple) separate from the water and break down into their basic components. These colors do not transfer to cup B, but their base colors do transfer. This means that while the original color (purple) does not transfer, the underlying colors that make up purple (such as red and blue) do transfer, resulting in a different color in cup B.

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  • 25. 

    Magic Milk: What causes the food coloring to burst away from the drop of soap?

    • A.

      Milk is mostly water, but it also contains tiny droplets of fat (lipid) suspended in the milk. Fats and proteins are sensitive to changes in the surrounding solution (the milk). Like other oils, milk fat is a non-polar molecule. It doesn’t dissolve in water. The tiny drop of soap is enough to break up and collect the fat molecules in the milk. Soap micelles surround the milk fat. As the soap molecules race around, bending and twisting to join up with the molecules of milk fat, it sends a ripple through the milk in all directions. The food coloring molecules are bumped and shoved everywhere. As the soap joins up with as many molecules as it can the action slows down and eventually stops. This is why milk with a higher fat content produces a better explosion of color—there’s just more fat to combine with all of those soap molecules.

    • B.

      Milk is mostly water, but it also contains tiny droplets of fat (lipid) suspended in the milk. Fats are sensitive to changes in the milk. Milk fat is a non-polar molecule. It doesn’t dissolve in water. The tiny drop of soap is enough to break the surface tension of the fat. The soap micelles surround the milk fat and form big color beads that roll around and bump the food coloring in all directions. The food coloring molecules are bumped and shoved everywhere.

    • C.

      Milk is all fat with a little water. Milk is sensitive to changes in the water. The tiny drop of soap is enough to turn the fat into a polar molecule and attract the water and food coloring. This causes the ripple of color in the milk.

    • D.

      Water is non-polar. Milk has fat and is non-polar and polar. When soap is introduced, the surface tension of the milk is broken and the milk fats chase the food coloring molecules to attach to them. This causes the ripple of color in the milk.

    Correct Answer
    A. Milk is mostly water, but it also contains tiny droplets of fat (lipid) suspended in the milk. Fats and proteins are sensitive to changes in the surrounding solution (the milk). Like other oils, milk fat is a non-polar molecule. It doesn’t dissolve in water. The tiny drop of soap is enough to break up and collect the fat molecules in the milk. Soap micelles surround the milk fat. As the soap molecules race around, bending and twisting to join up with the molecules of milk fat, it sends a ripple through the milk in all directions. The food coloring molecules are bumped and shoved everywhere. As the soap joins up with as many molecules as it can the action slows down and eventually stops. This is why milk with a higher fat content produces a better explosion of color—there’s just more fat to combine with all of those soap molecules.
    Explanation
    The fat molecules in milk are non-polar and do not dissolve in water. When a drop of soap is added to the milk, it breaks up and collects the fat molecules. Soap micelles surround the milk fat and as they move around, they cause a ripple effect through the milk. This movement of the soap molecules bumps and shoves the food coloring molecules, resulting in the burst of color. The more fat content in the milk, the better the explosion of color, as there are more fat molecules to combine with the soap molecules.

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  • 26. 

    Celery ClimbThis image shows a piece of the celery stalk. What do these red dots indicate? 

    • A.

      The red dots indicate where the celery stalk soaked up the food colored water.

    • B.

      The red dots indicate where the celery stalk is deteriorating.

    • C.

      The red dots indicate where the celery stalk is diseased.

    • D.

      The red dots indicate where the celery stalk is releasing its fluids.

    Correct Answer
    A. The red dots indicate where the celery stalk soaked up the food colored water.
    Explanation
    The red dots on the celery stalk indicate where it absorbed the food colored water.

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  • 27. 

    Celery ClimbWhat does this photo show?

    • A.

      This photo shows one of the red dyed celery stalk capillary tubes.

    • B.

      This photo shows that celery has red blood cells.

    • C.

      This photo shows that celery is made of red fibers.

    • D.

      This photo shows celery has a healthy stalk.

    Correct Answer
    A. This photo shows one of the red dyed celery stalk capillary tubes.
  • 28. 

    Dome-de-Dome What did the Dome-de-Dome activity demonstrate?

    • A.

      Dome-de-dome demonstrated that on a sheet of wax paper a bead of water is very cohesive and sticks together tightly due to its polarity and that a bead of oil that is non-polar is less cohesive and spreads out further and is flatter on the wax paper.

    • B.

      Dome-de-dome demonstrated that on a sheet of wax paper a bead of water is very adhesive and sticks to the wax paper because of its polarity and that a bead of oil that is non-polar does not stick to the wax paper.

    • C.

      Dome-de-dome demonstrated that on a sheet of wax paper a bead of water spreads out further and is flatter on the wax paper than the oil because it is polar.

    • D.

      Dome-de-dome demonstrated that on a sheet of wax paper a bead of oil is polar and sticks to the wax paper spreading flatter across the wax paper.

    Correct Answer
    A. Dome-de-dome demonstrated that on a sheet of wax paper a bead of water is very cohesive and sticks together tightly due to its polarity and that a bead of oil that is non-polar is less cohesive and spreads out further and is flatter on the wax paper.
    Explanation
    Dome-de-dome demonstrated that on a sheet of wax paper, a bead of water is very cohesive and sticks together tightly due to its polarity. On the other hand, a bead of oil, which is non-polar, is less cohesive and spreads out further and is flatter on the wax paper.

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  • 29. 

    Beads of Water and Oil:What do these images show about how water and oil behave on wax paper?

    • A.

      These images show that on a hydrophobic surface such as wax paper, water will bead up very tightly and be able to roll around. This is because the water is not attracted to the wax paper and does not want to interact with it. It shows that on a hydrophilic surface water will lay flatter because it is attracted to the surface.

    • B.

      These images show that on a hydrophilic surface such as wax paper, water will bead up very tightly and be able to roll around. This is because the water is attracted to the wax paper and does wants to interact with it. It shows that on a hydrophobic surface water will lay flatter because it is not attracted to the surface.

    • C.

      These images show that oil will lay flatter on a hydrophilic surface and bead up on a hydrophobic surface.

    • D.

      These images show that oil is hydrophobic and will be attracted to wax paper.

    Correct Answer
    A. These images show that on a hydrophobic surface such as wax paper, water will bead up very tightly and be able to roll around. This is because the water is not attracted to the wax paper and does not want to interact with it. It shows that on a hydrophilic surface water will lay flatter because it is attracted to the surface.
    Explanation
    The images demonstrate that on a hydrophobic surface like wax paper, water forms tight beads and can roll around. This occurs because water is not attracted to the wax paper and does not want to interact with it. Conversely, on a hydrophilic surface, water lays flatter because it is attracted to the surface.

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  • 30. 

    You Can't Fix What Won't Mix:What causes the food coloring to behave as it does when it is dropped into the graduated cylinder of oil and water? 

    • A.

      Since oil is less dense than water, the oil sits on top of the water. When it's dropped into the cylinder and hits the oil first, the food coloring forms a tight bead because it does not want to mix with the oil. Because the food coloring is water based, it is more dense than the oil and slowly sinks through it. When it reaches the intersection of the oil and water it sinks through and then the bead of food coloring bursts apart dissolving in the water.

    • B.

      Since oil is more dense than water, the water sits on top of the oil. When it's dropped into the cylinder and hits the water first, the food coloring forms a tight bead because it does not want to mix with it. Because the food coloring is oil based, it is more dense than the water and slowly sinks through it. When it reaches the intersection of the oil and water it sinks through and then bursts apart.

    • C.

      The food coloring is oil based and floats through the water to reach the oil.

    • D.

      The food coloring is more dense than the oil and the water and floats through the oil to reach the water. When the food coloring reaches the water it absorbs it.

    Correct Answer
    A. Since oil is less dense than water, the oil sits on top of the water. When it's dropped into the cylinder and hits the oil first, the food coloring forms a tight bead because it does not want to mix with the oil. Because the food coloring is water based, it is more dense than the oil and slowly sinks through it. When it reaches the intersection of the oil and water it sinks through and then the bead of food coloring bursts apart dissolving in the water.
    Explanation
    The food coloring forms a tight bead when dropped into the cylinder of oil and water because it does not want to mix with the oil. This is because oil is less dense than water, so the oil sits on top of the water. The food coloring, being water-based, is more dense than the oil and slowly sinks through it. When it reaches the intersection of the oil and water, it sinks through and the bead of food coloring bursts apart, dissolving in the water.

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  • 31. 

    A general rule in chemistry is that "like dissolves like".  This rule means that_______________

    • A.

      A general rule in chemistry is that "like dissolves like". This rule means that a solvent will dissolve substances that have similar molecular structures.

    • B.

      A general rule in chemistry is that "like dissolves like". This rule means that a solvent cannot dissolve substances that have a similar molecular structure.

    • C.

      A general rule in chemistry is that "like dissolves like". This rule means that a solute will dissolve particles that have a similar molecular structure.

    • D.

      A general rule in chemistry is that "like dissolves like". This rule means that a solvent will dissolve substances that are covalently bonded.

    Correct Answer
    A. A general rule in chemistry is that "like dissolves like". This rule means that a solvent will dissolve substances that have similar molecular structures.
    Explanation
    The correct answer is that a solvent will dissolve substances that have similar molecular structures. This is because the phrase "like dissolves like" refers to the idea that substances with similar chemical properties and intermolecular forces are more likely to dissolve in each other. Therefore, a solvent with a similar molecular structure to a solute will have compatible intermolecular forces and be able to dissolve the solute.

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  • 32. 

    What do these symbols​ mean?     or  

    • A.

      These symbols​ mean that the atom has either a slight (partial) positive or negative charge.

    • B.

      These symbols​ mean that the molecule has either a slight (partial) positive or negative charge.

    • C.

      These symbols​ mean that the atom has a positive or negative electronegativity.

    • D.

      These symbols​ mean that the atom is polar.

    Correct Answer
    A. These symbols​ mean that the atom has either a slight (partial) positive or negative charge.
    Explanation
    The symbols     or   in chemistry represent a partial positive or negative charge on an atom. This indicates that the atom is involved in a polar covalent bond, where electrons are not shared equally between atoms. The presence of these symbols suggests that there is an uneven distribution of electron density within the molecule, resulting in regions of partial positive and partial negative charges.

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  • 33. 

    In order to dissolve a substance, solvent particles must be able to __________________

    • A.

      In order to dissolve a substance, solvent particles must be able to attract solute particles more strongly than the solute particles attract one another.

    • B.

      In order to dissolve a substance, solvent particles must be able to covalently and ionically bond with one another.

    • C.

      In order to dissolve a substance, solute particles must be able to attract each other strongly to form a solution.

    • D.

      In order to dissolve a substance, solvent particles must be soluble causing the solvent to dissolve.

    Correct Answer
    A. In order to dissolve a substance, solvent particles must be able to attract solute particles more strongly than the solute particles attract one another.
    Explanation
    Solvent particles need to have a stronger attraction to the solute particles than the solute particles have for each other in order for the substance to dissolve. This is because the solvent particles surround and separate the solute particles, breaking their attractive forces and allowing the solute to disperse evenly throughout the solvent.

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  • 34. 

    Why do some ionic compounds like silver chloride (AgCl) not dissolve in water while others do?

    • A.

      Some ionic compounds dissolve in water and others do not because attractions between ions in the crystal are stronger than those between the ions and water molecules. So the water cannot pull the ions apart.

    • B.

      Some covalent compounds dissolve in water and others do not because attractions between ions in the crystal are stronger than those between the ions and water molecules. So the water cannot pull the ions apart.

    • C.

      Some ionic compounds dissolve in water and others do not because attractions between atoms in the crystal are stronger than those between the atoms and water molecules. So the water cannot pull the ions apart.

    • D.

      Some ionic compounds dissolve in water and others do not because attractions between ions in the covalent bond are stronger than those between the ions and water molecules. So the water cannot pull the ions apart.

    Correct Answer
    A. Some ionic compounds dissolve in water and others do not because attractions between ions in the crystal are stronger than those between the ions and water molecules. So the water cannot pull the ions apart.
    Explanation
    Some ionic compounds dissolve in water and others do not because attractions between ions in the crystal are stronger than those between the ions and water molecules. So the water cannot pull the ions apart.

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  • 35. 

    When a molecular compound dissolves, do the molecules break apart?

    • A.

      When a molecular compound dissolves, the molecules move toward the water molecules and away from one another, the individual molecules do not break apart.

    • B.

      When a molecular compound dissolves, the molecules separate and re-bond individually forming Hydrogen bonds.

    • C.

      When a molecular compound dissolves, the molecules move toward the Hydrogen and the individual molecules break apart.

    • D.

      When a molecular compound dissolves, the molecules separate and are distributed evenly over the whole water molecule.

    Correct Answer
    A. When a molecular compound dissolves, the molecules move toward the water molecules and away from one another, the individual molecules do not break apart.
    Explanation
    When a molecular compound dissolves, the molecules move towards the water molecules and away from one another, indicating that the individual molecules do not break apart. This explanation suggests that the intermolecular forces between the solute molecules and the solvent (water) molecules are stronger than the forces holding the solute molecules together. As a result, the solute molecules disperse throughout the solvent, but their chemical structure remains intact.

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  • 36. 

    What is a nonpolar molecule?

    • A.

      A nonpolar molecule's electrons are evenly distributed over the whole molecule so it does not have partial charges. Without the partial polar charges, most nonpolar compounds do not dissolve in polar compounds. Nonpolar compounds are insoluble in polar compounds.

    • B.

      A nonpolar molecule's electrons are transferred causing it to have no partial charges.Without the partial polar charges, most nonpolar compounds do not dissolve in polar compounds. Nonpolar compounds are insoluble in polar compounds.

    • C.

      A nonpolar molecule's electrons bond with polar molecules and are soluble in polar compounds.

    • D.

      A nonpolar molecule's protons are evenly distributed over the whole molecule so it does not have partial charges. Without the partial polar charges, most nonpolar compounds do not dissolve in polar compounds. Nonpolar compounds are insoluble in polar compounds.

    Correct Answer
    A. A nonpolar molecule's electrons are evenly distributed over the whole molecule so it does not have partial charges. Without the partial polar charges, most nonpolar compounds do not dissolve in polar compounds. Nonpolar compounds are insoluble in polar compounds.
    Explanation
    A nonpolar molecule's electrons are evenly distributed over the whole molecule so it does not have partial charges. Without the partial polar charges, most nonpolar compounds do not dissolve in polar compounds. Nonpolar compounds are insoluble in polar compounds.

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  • 37. 

    Why is energy needed to dissolve a solute?

    • A.

      Energy is needed to dissolve a solute to break the attractions between particals of solute.

    • B.

      Energy is needed to dissolve a solute to form covalent bonds between particals of solute.

    • C.

      Energy is needed to dissolve a solute to ionically transfer particals of solute.

    • D.

      Energy is needed to dissolve a solute to limit the attractions between particals of solute.

    Correct Answer
    A. Energy is needed to dissolve a solute to break the attractions between particals of solute.
    Explanation
    When a solute is dissolved, the attractions between the particles of the solute need to be broken. These attractions can be in the form of intermolecular forces, such as hydrogen bonding or London dispersion forces. Breaking these attractions requires energy input, which is why energy is needed to dissolve a solute.

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  • 38. 

    How does increase in surface area help a solute dissolve more quickly?

    • A.

      Increase in surface area helps a solute to touch more of the solvent. As a result, there are more collisions between solute particles and solvent particles dissolving quicker and more efficiently.

    • B.

      Increase in surface area helps a solute to consolidate more of the solvent. As a result, there are less collisions between solute particles and solvent particles dissolving quicker and more efficiently.

    • C.

      Increase in surface area helps a solvent to touch more of the solution. As a result, there are more collisions between solvent particles and solution, dissolving quicker and more efficiently.

    • D.

      Increase in surface area helps a particle join more of the solvent. As a result, there are more particles between the solute and solvent, dissolving quicker and more efficiently.

    Correct Answer
    A. Increase in surface area helps a solute to touch more of the solvent. As a result, there are more collisions between solute particles and solvent particles dissolving quicker and more efficiently.
    Explanation
    Increase in surface area helps a solute to touch more of the solvent, leading to more collisions between solute particles and solvent particles. This results in the solute dissolving more quickly and efficiently.

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  • 39. 

    How does an increase in temperature help a solute dissolve?

    • A.

      An increase in temperature helps a solute dissolve by causing its particles to move more quickly. This causes the particles to collide more frequently. At higher temperatures, the collisions among particles transfer more energy. More energy breaks bonds between solute particles more easily.

    • B.

      An increase in temperature helps a solute dissolve by causing its particles to solidify more quickly. This causes the particles to adhere more frequently. At higher temperatures, the adhesion among particles transfer more energy. More energy breaks bonds between solute particles more easily.

    • C.

      An increase in temperature helps a solute dissolve by causing its particles to transfer more quickly. This causes the particles to transfer more frequently. At higher temperatures, the transfer among particles build-up more energy. More energy solidifies the bonds between solute particles more easily.

    • D.

      It does not. A decrease in temperature helps a solute dissolve by causing its particles to move more slowly and therefore more solidly combine, dissolving the particles more efficiently.

    Correct Answer
    A. An increase in temperature helps a solute dissolve by causing its particles to move more quickly. This causes the particles to collide more frequently. At higher temperatures, the collisions among particles transfer more energy. More energy breaks bonds between solute particles more easily.
    Explanation
    An increase in temperature helps a solute dissolve because it causes the solute particles to move more quickly. This increased movement leads to more frequent collisions between the solute particles and the solvent particles. The collisions transfer more energy, which in turn breaks the bonds between the solute particles more easily. As a result, the solute particles are able to disperse and dissolve into the solvent more effectively.

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  • 40. 

    How does stirring or shaking a solution allow more contact between solvent and solute particles?

    • A.

      Stirring or shaking moves the dissolved solute particles away from the rest of the solute. Then more solvent can reach the solute that has not dissolved.

    • B.

      Stirring or shaking moves the dissolved solute particles toward the rest of the solute. Then more solvent can reach the solute that has not dissolved.

    • C.

      Stirring or shaking moves the dissolved solute particles outside of the rest of the solute. Then the solvent can move into the solute that has not dissolved.

    • D.

      Stirring or shaking eliminates the solute particles from the rest of the solute. Then more solvent can dissolve the remaining solute.

    Correct Answer
    A. Stirring or shaking moves the dissolved solute particles away from the rest of the solute. Then more solvent can reach the solute that has not dissolved.
    Explanation
    Stirring or shaking a solution disrupts the arrangement of the solute particles, causing them to disperse throughout the solvent. This movement creates more contact between the solvent and the solute particles that have not yet dissolved. As a result, the solvent can more effectively dissolve the remaining solute, leading to a more homogeneous solution.

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  • 41. 

    How can a solute affect a solutions physical properties?

    • A.

      A solute can change the physical properties of the pure solvent. One way a solute can affect a solution's physical property is to change its response to temperature: freezing or melting point.

    • B.

      A solute cannot really change the physical properties of the pure solvent. One way a solute may affect a solution's physical property is to change its boiling and cooling point.

    • C.

      A solute can change the physical properties of Hydrogen bonded solvents. One way a solute can affect a Hydrogen bonded solution's physical property is to change its crystal formation.

    • D.

      A solute can change the physical, chemical and behavioral properties of the pure solvent. One way a solute can affect a solution's properties is to change its crystalization points.

    Correct Answer
    A. A solute can change the physical properties of the pure solvent. One way a solute can affect a solution's physical property is to change its response to temperature: freezing or melting point.
    Explanation
    A solute can indeed change the physical properties of the pure solvent. One specific way this can occur is by altering the solvent's response to temperature, specifically its freezing or melting point.

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