Solutions And Mixtures

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Solutions And Mixtures - Quiz

This is a quiz over how well you know 9th grade physical science containing solutions and mixtures.


Questions and Answers
  • 1. 

    The oceans are an example of a(n)______solution.

    • A.

      Gaseous

    • B.

      Liquid

    • C.

      Solid

    • D.

      Anhydrous

    Correct Answer
    B. Liquid
    Explanation
    The oceans are considered a liquid solution because they consist of a mixture of water and various dissolved substances. A solution is formed when one substance (the solute) is dissolved in another substance (the solvent), and in the case of the oceans, the solute is the various salts and minerals dissolved in the water. Therefore, the correct answer is "liquid."

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  • 2. 

    In a solution, the substance which is being dissolved is the_____.

    • A.

      Solvent

    • B.

      Solute

    • C.

      Liquid

    • D.

      Gas

    Correct Answer
    B. Solute
    Explanation
    In a solution, the substance that is being dissolved is called the solute. The solute is the component that is present in a smaller quantity and gets dissolved in the solvent, which is the component present in a larger quantity. The solute particles are dispersed or dissolved in the solvent, resulting in a homogeneous mixture.

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  • 3. 

    A solution that contains all the solute it can hold at a given temperature is _____.

    • A.

      Supersaturated

    • B.

      Dilute

    • C.

      Saturated

    • D.

      Unsaturated

    Correct Answer
    C. Saturated
    Explanation
    A solution that contains all the solute it can hold at a given temperature is saturated. This means that the solution has reached its maximum capacity to dissolve solute particles and any additional solute added will not dissolve.

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  • 4. 

    The solute that is found in the greatest amount in ocean water is______.

    • A.

      H20

    • B.

      KCl

    • C.

      NaCl

    • D.

      CuSO4

    Correct Answer
    C. NaCl
    Explanation
    NaCl, or sodium chloride, is the correct answer because it is the most abundant solute found in ocean water. It is the primary component of seawater and accounts for approximately 85% of the total dissolved salts in the ocean.

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  • 5. 

    A substance that does not conduct an electric current when it forms a solution is_____.

    • A.

      A polar substance

    • B.

      A nonpolar substance

    • C.

      A nonelectrolyte

    • D.

      An electrolyte

    Correct Answer
    C. A nonelectrolyte
    Explanation
    A substance that does not conduct an electric current when it forms a solution is a nonelectrolyte. This is because nonelectrolytes do not dissociate into ions in solution, which means they do not have free-moving charged particles that can carry an electric current. In contrast, electrolytes can conduct electricity because they dissociate into ions in solution, allowing the charged particles to move and carry the current. Polar or nonpolar substances do not necessarily determine the ability to conduct electricity, as it depends on the dissociation of the substance in solution.

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  • 6. 

    The process by which the positive and negative ions of an ionic compound sperate in water is called____.

    • A.

      Dissociation

    • B.

      Ionization

    • C.

      Saturation

    • D.

      Polarity

    Correct Answer
    A. Dissociation
    Explanation
    Dissociation refers to the process in which the positive and negative ions of an ionic compound separate when it is dissolved in water. This occurs due to the attraction between the ions and the polar water molecules, which causes the compound to break apart into its individual ions. This process is different from ionization, which refers to the formation of ions from neutral atoms or molecules. Saturation and polarity are not related to the separation of ions in water.

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  • 7. 

    When a gas is dissolved in a liquid, the gas dissolves faster if the liquid is ____.

    • A.

      Heated

    • B.

      Cooled

    • C.

      An electrolyte

    • D.

      Under low pressure

    Correct Answer
    B. Cooled
    Explanation
    When a gas is dissolved in a liquid, the gas particles have higher kinetic energy and move faster. Cooling the liquid reduces the kinetic energy of the gas particles, causing them to slow down and interact more readily with the liquid molecules. This increased interaction leads to a faster dissolution of the gas in the liquid.

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  • 8. 

    Increasing the surface area of a solid _____.

    • A.

      Causes the solid to ionize

    • B.

      Slows the rate of solution

    • C.

      Speeds the rate of solution

    • D.

      Has no effect on the rate of solution

    Correct Answer
    C. Speeds the rate of solution
    Explanation
    Increasing the surface area of a solid speeds up the rate of solution. When the surface area of a solid is increased, more of the solid is exposed to the solvent, allowing for more efficient and faster dissolution. This is because the increased surface area provides more contact points for the solvent molecules to interact with the solid particles, leading to a quicker dissolution process. Therefore, increasing the surface area of a solid accelerates the rate at which it dissolves in a solvent.

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  • 9. 

    Any method of removing salts from ocean water is called____.

    • A.

      Desalination

    • B.

      Distillation

    • C.

      Evaporation

    • D.

      Condensation

    Correct Answer
    A. Desalination
    Explanation
    Desalination is the correct answer because it refers to the process of removing salts from ocean water. It is a method that involves removing the salts and other impurities from the water to make it suitable for various purposes such as drinking, irrigation, or industrial use. Distillation, evaporation, and condensation are all processes that can be used in the desalination process, but desalination is the overarching term that encompasses all methods of removing salts from ocean water.

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  • 10. 

    The process in which fresh water is obtained from ocean water that has been evaporated and condensed is called ____.

    • A.

      Ionization

    • B.

      Dissociation

    • C.

      Distillation

    • D.

      The freeze method

    Correct Answer
    C. Distillation
    Explanation
    Distillation is the correct answer because it refers to the process of obtaining fresh water from ocean water that has been evaporated and condensed. During distillation, the water is heated to evaporate it, and then the vapor is condensed and collected, leaving behind the impurities. This process allows for the separation of fresh water from salt and other contaminants present in the ocean water.

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  • 11. 

    The concentration of a solution that contains much solute in the solvent could be described as _____.

    • A.

      Polar

    • B.

      Concentrated

    • C.

      Unsaturated

    • D.

      Dilute

    Correct Answer
    B. Concentrated
    Explanation
    The correct answer is "concentrated" because a solution that contains a large amount of solute in the solvent is considered to be concentrated. This means that there is a high ratio of solute to solvent, resulting in a strong solution.

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  • 12. 

    An alloy is an example of a _____.

    • A.

      Gaseous solution

    • B.

      Liquid solution

    • C.

      Dilute solution

    • D.

      Solid solution

    Correct Answer
    D. Solid solution
    Explanation
    An alloy is an example of a solid solution because it is a homogeneous mixture of two or more metals or a metal and a non-metal. In an alloy, the atoms of different elements are evenly distributed throughout the solid, resulting in a uniform composition. This solid solution formation occurs when the atoms of the different elements are similar in size and have similar chemical properties, allowing them to mix together at the atomic level. Examples of alloys include bronze (copper and tin), steel (iron and carbon), and brass (copper and zinc).

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  • 13. 

    Adding more solute to a solvent _____.

    • A.

      Decreases its boiling point

    • B.

      Increases its freezing point

    • C.

      Increases its boiling point

    • D.

      Does not affect its boiling point

    Correct Answer
    C. Increases its boiling point
    Explanation
    When more solute is added to a solvent, it increases the boiling point of the solvent. This is because the presence of the solute particles disrupts the solvent's intermolecular forces, making it more difficult for the solvent molecules to escape into the vapor phase. As a result, a higher temperature is required to overcome these forces and reach the boiling point. Therefore, adding more solute to a solvent increases its boiling point.

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  • 14. 

    When placed in water, some covalent compounds _____.

    • A.

      Ionize

    • B.

      Become radioactive

    • C.

      Form protons

    • D.

      Dissociate

    Correct Answer
    A. Ionize
    Explanation
    When placed in water, some covalent compounds ionize. This means that they break apart into ions, which are charged particles. This process occurs because water molecules are polar, meaning they have a positive and negative end. The positive end of water molecules attracts the negatively charged ions, causing them to separate from the covalent compound. This results in the formation of a solution with charged particles called ions.

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  • 15. 

    Which of the following will speed up the dissolving of a solid solute in water?

    • A.

      Cool the solution

    • B.

      Stir the solution

    • C.

      Grind up the solvent

    • D.

      Freeze the solute

    Correct Answer
    B. Stir the solution
    Explanation
    Stirring the solution will speed up the dissolving of a solid solute in water. When the solution is stirred, it increases the contact between the solute particles and the water molecules. This increased contact allows for a faster diffusion of the solute particles into the solvent, resulting in a quicker dissolution process. Cooling the solution, grinding up the solute, and freezing the solute may have some effects on the dissolution, but they are not as effective as stirring in speeding up the process.

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  • 16. 

    Which of the following combinations would increase the solubility of a gas in a liquid?

    • A.

      Decrease the pressure and decrease the temperature

    • B.

      Decrease the pressure and increase the temperature

    • C.

      Increase the pressure and decrease the temperature

    • D.

      Increase the pressure and increase the temperature

    Correct Answer
    C. Increase the pressure and decrease the temperature
    Explanation
    Increasing the pressure and decreasing the temperature would increase the solubility of a gas in a liquid. This is because according to Henry's law, the solubility of a gas is directly proportional to the partial pressure of the gas above the liquid. By increasing the pressure, more gas molecules are forced into the liquid, increasing its solubility. Additionally, decreasing the temperature also increases the solubility of gases in liquids, as lower temperatures reduce the kinetic energy of the gas molecules, making them more likely to dissolve in the liquid.

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  • 17. 

    Solutions of electrolytes and metals are ____.

    • A.

      Insulators

    • B.

      Conductors

    • C.

      Polar

    • D.

      Negative

    Correct Answer
    B. Conductors
    Explanation
    Solutions of electrolytes and metals are conductors because they allow the flow of electric current. Electrolytes are substances that dissociate into ions when dissolved in water, and these ions are able to carry electric charge. Metals, on the other hand, have delocalized electrons that are free to move, allowing them to conduct electricity. Therefore, both electrolyte and metal solutions are conductive and facilitate the movement of electric charges.

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  • 18. 

    The amount of solute that can be dissolved in a specific amount of solvent at a given temperature is its _____.

    • A.

      Concentration

    • B.

      Density

    • C.

      Dilution

    • D.

      Solubility

    Correct Answer
    D. Solubility
    Explanation
    Solubility refers to the maximum amount of solute that can be dissolved in a specific amount of solvent at a given temperature. It is a measure of how well a substance can dissolve in a solvent. Concentration, on the other hand, refers to the amount of solute present in a given amount of solvent or solution. Density is a measure of the mass per unit volume of a substance, while dilution refers to the process of reducing the concentration of a solute in a solution by adding more solvent.

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  • 19. 

    A molecule that is positively charged on one end and negatively charged on the other end is ____.

    • A.

      Polar

    • B.

      Magnetic

    • C.

      Nonpolar

    • D.

      Radioactive

    Correct Answer
    A. Polar
    Explanation
    A molecule that is positively charged on one end and negatively charged on the other end is polar. This is because the molecule has an uneven distribution of charge, with one end being more positive and the other end being more negative. This polarity allows the molecule to interact with other polar molecules or ions through attractions between opposite charges, such as hydrogen bonding. Magnetic, nonpolar, and radioactive do not accurately describe a molecule with this charge distribution.

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  • 20. 

    __________ means that a substance is physically combined and can be separated into different parts.

    Correct Answer
    heterogeneous, heterogenous, heterogeneous mixture
    Explanation
    The term "heterogeneous" refers to a substance that is composed of different components that are physically combined. It implies that the substance is not uniform throughout and can be separated into its individual parts. The variations in composition and properties within the substance make it heterogeneous. The terms "heterogenous" and "heterogeneous mixture" also convey the same meaning, indicating a substance that is not uniform and can be separated.

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  • 21. 

    __________ means that a substance is chemically combined and can not be separated.

    Correct Answer
    homogeneous mixture, homogeneous, homogenous
    Explanation
    Homogeneous mixture refers to a substance that is chemically combined and cannot be separated. It implies that the components of the mixture are uniformly distributed and indistinguishable, creating a uniform composition throughout. The terms "homogeneous" and "homogenous" also convey the same meaning, emphasizing the uniformity and inability to separate the substances within the mixture.

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  • 22. 

    The ______ is the substance being dissolved.

    Correct Answer
    solute
    Explanation
    The solute is the substance that is being dissolved in a solution. In a solution, the solute is the component that is present in a smaller quantity and is dissolved by the solvent. It can be a solid, liquid, or gas that is dissolved in a liquid or gas solvent. The solute particles disperse and mix evenly throughout the solvent, resulting in a homogeneous mixture.

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  • 23. 

    The _____ is what you're dissolving something in.

    Correct Answer
    solvent
    Explanation
    The term "solvent" refers to the substance in which another substance is dissolved. It is the medium or liquid in which a solute (the substance being dissolved) is mixed to form a homogeneous solution. The solvent plays a crucial role in the dissolution process by breaking down the solute's particles and allowing them to disperse evenly throughout the solution. Without a solvent, it would not be possible to dissolve substances and create solutions.

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  • 24. 

    ________ means there is a very small amount of solute.

    Correct Answer
    dilute
    Explanation
    The term "dilute" refers to a solution that contains a very small amount of solute in relation to the solvent. It indicates that the solute has been dispersed or dissolved in a large amount of solvent, resulting in a low concentration. This term is commonly used in chemistry to describe solutions that have been weakened or thinned out by the addition of more solvent.

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  • 25. 

    _____ means that the solvent can dissolve more and has NOT reached its limit.

    Correct Answer
    unsaturated
    Explanation
    Unsaturated means that the solvent can dissolve more solute and has not reached its limit. In other words, it is capable of dissolving additional solute particles. This term is used to describe a solution where the amount of solute dissolved is less than the maximum amount that can be dissolved in the solvent.

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  • 26. 

    _____ means that the solvent contains more solute than needed; extra solute precipitates out.

    Correct Answer
    supersaturated
    Explanation
    Supersaturated refers to a solution in which the solvent contains an excess amount of solute, beyond its normal solubility limit. As a result, the extra solute precipitates out of the solution. This occurs when a solution is heated and then slowly cooled, allowing more solute to dissolve than would normally be possible at the lower temperature. The excess solute remains dissolved until a disturbance or seed crystal is introduced, causing the excess solute to come out of solution and form a solid precipitate.

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  • 27. 

    ____ means the solution has reached its limit on containing solute.

    Correct Answer
    saturated
    Explanation
    The term "saturated" refers to a solution that has reached its maximum capacity to dissolve a solute. In other words, it has reached its limit and can no longer dissolve any more solute. This occurs when the solvent has dissolved as much solute as it can at a given temperature and pressure.

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  • 28. 

    ____ means that there is a large amound of solute.

    Correct Answer
    concentrated
    Explanation
    Concentrated means that there is a large amount of solute. This term is used to describe a solution or mixture where the ratio of solute to solvent is high. In a concentrated solution, the solute particles are closely packed together, resulting in a high concentration. This can be contrasted with a dilute solution, where there is a low concentration of solute. Concentration is an important factor in various fields such as chemistry, biology, and medicine, as it affects the properties and behavior of substances.

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Nov 12, 2008
    Quiz Created by
    Danielleneck
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