IB Biology: Water

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  • 1/45 Questions

    Which of the following is true about bonding between atoms in water?

    • It is ionic
    • It is purely covalent
    • It is polar covalent
    • All of the above
    • None of the above
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About This Quiz

Explore the molecular structure and properties of water in this IB Biology quiz. Focus on polar covalent bonds, hydrogen bonding, and molecule polarity. Essential for students aiming to understand water's critical role in biological systems.

IB Biology: Water - Quiz

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  • 2. 

    Which pole of a water molecule is slightly positive?

    • The oxygen pole

    • Both hydrogen poles

    • Only one hydrogen pole at a time

    • All of the above

    • None of the above

    Correct Answer
    A. Both hydrogen poles
    Explanation
    The correct answer is both hydrogen poles. In a water molecule, the oxygen atom is more electronegative than the hydrogen atoms. This leads to an uneven distribution of electrons, causing the oxygen atom to have a slightly negative charge and the hydrogen atoms to have a slightly positive charge. Therefore, both hydrogen poles of a water molecule are slightly positive.

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  • 3. 

    Which pole of a water molecule is slightly negative?

    • The oxygen pole

    • Both hydrogen poles

    • Only one hydrogen pole at a time

    • All of the above

    • None of the above

    Correct Answer
    A. The oxygen pole
    Explanation
    The oxygen pole of a water molecule is slightly negative because oxygen is more electronegative than hydrogen. This means that oxygen attracts the shared electrons in the covalent bond closer to itself, creating a partial negative charge. The hydrogen poles, on the other hand, are slightly positive due to the electron density being pulled away from them. Therefore, the correct answer is "The oxygen pole."

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  • 4. 

    A bond between the positive pole of one water molecule and the negative pole of another water molecule is known as what?

    • Ionic bond

    • Covalent bond

    • Polar covalent bond

    • All of the above

    • None of the above

    Correct Answer
    A. None of the above
    Explanation
    The bond between the positive pole of one water molecule and the negative pole of another water molecule is known as a hydrogen bond. Hydrogen bonds are not classified as ionic, covalent, or polar covalent bonds.

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  • 5. 

    A bond between the positive pole of one water molecule and the negative pole of another water molecule is known as what?

    • Covalent bond

    • Polar covalent bond

    • Hydrogen bond

    • All of the above

    • None of the above

    Correct Answer
    A. Hydrogen bond
    Explanation
    A hydrogen bond is a type of bond formed between a hydrogen atom with a partial positive charge and an electronegative atom with a partial negative charge, such as oxygen or nitrogen. In the case of water molecules, the oxygen atom is slightly negatively charged while the hydrogen atoms are slightly positively charged. This allows for the formation of hydrogen bonds between adjacent water molecules, resulting in the unique properties of water, such as its high boiling point and surface tension. Therefore, the correct answer is hydrogen bond.

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  • 6. 

    A bond between the positive pole of one water molecule and the negative pole of another water molecule is known as what?

    • Ionic bond

    • Polar covalent bond

    • Hydrogen bond

    • All of the above

    • None of the above

    Correct Answer
    A. Hydrogen bond
    Explanation
    A hydrogen bond is a type of bond that forms between a hydrogen atom with a partial positive charge and an atom with a partial negative charge, such as oxygen or nitrogen. In the case of water molecules, the hydrogen bond occurs between the positive pole of one water molecule (the hydrogen atom) and the negative pole of another water molecule (the oxygen atom). This type of bond is weaker than an ionic bond or a polar covalent bond, but it is responsible for many important properties of water, such as its high boiling point and its ability to dissolve many substances.

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  • 7. 

    A bond between the positive pole of one water molecule and the negative pole of another water molecule is known as what?

    • Polar covalent bond

    • Hydrogen bond

    • Ionic bond

    • All of the above

    • None of the above

    Correct Answer
    A. Hydrogen bond
    Explanation
    A hydrogen bond is a type of bond that forms between the positive pole of one water molecule (hydrogen) and the negative pole of another water molecule (oxygen). This bond is relatively weak compared to covalent or ionic bonds, but it is important in many biological and chemical processes. Therefore, the correct answer is hydrogen bond.

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  • 8. 

    What type of intermolecular bonds are responsible for the properties of water that make it useful for living organisms?

    • Ionic bonds

    • Covalent bonds

    • Polar covalent bonds

    • All of the above

    • None of the above

    Correct Answer
    A. None of the above
    Explanation
    The correct answer is "None of the above" because the properties of water that make it useful for living organisms are due to hydrogen bonding, which is a type of intermolecular bond different from ionic, covalent, or polar covalent bonds. Hydrogen bonding is responsible for water's high boiling point, its ability to dissolve many substances, its surface tension, and its role as a solvent in biological systems.

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  • 9. 

    What type of intermolecular bonds are responsible for the properties of water that make it useful for living organisms?

    • Hydrogen bonds

    • Ionic bonds

    • Polar covalent bonds

    • All of the above

    • None of the above

    Correct Answer
    A. Hydrogen bonds
    Explanation
    Hydrogen bonds are responsible for the properties of water that make it useful for living organisms. These bonds occur between the hydrogen atom of one water molecule and the oxygen atom of another water molecule. They are relatively weak, but they contribute to the high boiling point, high specific heat capacity, and surface tension of water. These properties are essential for various biological processes, such as regulating body temperature, facilitating chemical reactions, and providing a medium for nutrient transport in living organisms. Ionic bonds and polar covalent bonds do not play a significant role in the unique properties of water.

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  • 10. 

    What type of intermolecular bonds are responsible for the properties of water that make it useful for living organisms?

    • Hydrogen bonds

    • Covalent bonds

    • Polar covalent bonds

    • All of the above

    • None of the above

    Correct Answer
    A. Hydrogen bonds
    Explanation
    Hydrogen bonds are responsible for the properties of water that make it useful for living organisms. Water molecules are polar, with the oxygen atom being slightly negative and the hydrogen atoms being slightly positive. This polarity allows water molecules to form hydrogen bonds with each other, creating a network of interconnected molecules. These hydrogen bonds give water its high boiling point, high specific heat capacity, and strong cohesion and adhesion properties. These properties are essential for various biological processes, such as maintaining temperature stability, facilitating nutrient transport, and providing a medium for chemical reactions.

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  • 11. 

    Which property of water describes the tendency of water molecules to stick together due to the formation of hydrogen bonds between molecules?

    • Cohesion

    • Solvent

    • Thermal

    • All of the above

    • None of the above

    Correct Answer
    A. Cohesion
    Explanation
    Cohesion is the property of water that describes the tendency of water molecules to stick together due to the formation of hydrogen bonds between molecules. This property allows water to have a high surface tension and enables capillary action, which is important for the transportation of water in plants. Water's cohesive properties also contribute to its ability to form droplets and to resist breaking apart.

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  • 12. 

    Which property of water describes the tendency of water molecules to stick together due to the formation of hydrogen bonds between molecules?

    • Polarity

    • Thermal

    • Solvent

    • All of the above

    • None of the above

    Correct Answer
    A. None of the above
    Explanation
    The correct answer is "None of the above." The property of water that describes the tendency of water molecules to stick together due to the formation of hydrogen bonds between molecules is cohesion. Cohesion is responsible for many of water's unique properties, such as surface tension and capillary action. Polarity refers to the uneven distribution of electrons in a molecule, thermal refers to the ability of water to absorb and retain heat, and solvent refers to water's ability to dissolve other substances. While these properties are important characteristics of water, they do not specifically describe the tendency of water molecules to stick together.

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  • 13. 

    Which property of water describes the tendency of water molecules to stick together due to the formation of hydrogen bonds between molecules?

    • Polarity

    • Transport

    • Coolant

    • All of the above

    • None of the above

    Correct Answer
    A. None of the above
    Explanation
    The correct answer is None of the above. The property of water that describes the tendency of water molecules to stick together due to the formation of hydrogen bonds between molecules is called cohesion. Cohesion is responsible for many of water's unique properties, such as surface tension and capillary action. Polarity refers to the uneven distribution of charge within a molecule, which is true for water but is not specifically related to the sticking together of water molecules. Transport and coolant are not properties of water.

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  • 14. 

    Which type of bond is responsible for water's cohesive properties?

    • Covalent

    • Polar covalent

    • Hydrogen

    • All of the above

    • None of the above

    Correct Answer
    A. Hydrogen
    Explanation
    Hydrogen bonds are responsible for water's cohesive properties. In a water molecule, the oxygen atom is slightly negative, while the hydrogen atoms are slightly positive. This creates an attraction between the oxygen of one water molecule and the hydrogen of another. These hydrogen bonds are weak individually, but collectively they contribute to the cohesive nature of water, allowing it to stick to itself and form droplets, as well as giving water its high surface tension.

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  • 15. 

    Which type of bond is responsible for water's cohesive properties?

    • Ionic

    • Covalent

    • Polar covalent

    • All of the above

    • None of the above

    Correct Answer
    A. None of the above
    Explanation
    Water's cohesive properties are due to hydrogen bonding. Hydrogen bonding is a type of intermolecular force that occurs when a hydrogen atom, covalently bonded to an electronegative atom, is attracted to another electronegative atom nearby. In the case of water, the oxygen atom is highly electronegative and forms hydrogen bonds with neighboring water molecules. This cohesive force between water molecules allows them to stick together, giving water its high surface tension and the ability to form droplets. Since none of the options provided mention hydrogen bonding, the correct answer is "None of the above".

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  • 16. 

    Which type of bond is responsible for water's cohesive properties?

    • Ionic

    • Hydrogen

    • Polar

    • All of the above

    • None of the above

    Correct Answer
    A. Hydrogen
    Explanation
    Hydrogen bonds are responsible for water's cohesive properties. These bonds form between the positively charged hydrogen atoms of one water molecule and the negatively charged oxygen atoms of neighboring water molecules. This attraction creates a cohesive force that holds water molecules together, allowing them to stick to each other. This cohesive property of water is important for many biological processes, such as the transport of water and nutrients in plants and the ability of water to form droplets.

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  • 17. 

    Which type of bond is responsible for water's ability to transport substances in the xylem of plants?

    • Ionic

    • Polar

    • Hydrogen

    • All of the above

    • None of the above

    Correct Answer
    A. Hydrogen
    Explanation
    Hydrogen bonds are responsible for water's ability to transport substances in the xylem of plants. Hydrogen bonds occur between the hydrogen atom of one water molecule and the oxygen atom of another water molecule. These bonds create a cohesive force that allows water molecules to stick together, forming a continuous column in the xylem. This cohesion helps water to move upwards against gravity in the plant, allowing for the transport of nutrients and water from the roots to the rest of the plant.

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  • 18. 

    Which type of bond is responsible for water's ability to transport substances in the xylem of plants?

    • Hydrogen

    • Cohesive

    • Polar

    • All of the above

    • None of the above

    Correct Answer
    A. Hydrogen
    Explanation
    Hydrogen bonds are responsible for water's ability to transport substances in the xylem of plants. Hydrogen bonding occurs between the positively charged hydrogen atoms of one water molecule and the negatively charged oxygen atoms of neighboring water molecules. This cohesive force allows water molecules to stick together, forming a continuous column in the xylem. Additionally, water is a polar molecule, with a slightly positive charge on the hydrogen atoms and a slightly negative charge on the oxygen atom. This polarity allows water to dissolve and transport substances, such as minerals and nutrients, in the xylem.

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  • 19. 

    Which type of bond is responsible for water's ability to move from the roots of a tree to the leaves?

    • Ionic

    • Polar covalent

    • Hydrogen

    • All of the above

    • None of the above

    Correct Answer
    A. Hydrogen
    Explanation
    Water's ability to move from the roots of a tree to the leaves is due to hydrogen bonds. Hydrogen bonds are formed between the positively charged hydrogen atoms of one water molecule and the negatively charged oxygen atoms of neighboring water molecules. These bonds create a cohesive force that allows water molecules to stick together and move as a continuous column through the xylem vessels in plants. This process, known as capillary action, enables water to be transported against gravity from the roots to the leaves.

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  • 20. 

    Which type of bond is responsible for water's high surface tension?

    • Hydrogen

    • Polar covalent

    • Ionic

    • All of the above

    • None of the above

    Correct Answer
    A. Hydrogen
    Explanation
    Hydrogen bonding is responsible for water's high surface tension. In a water molecule, the oxygen atom is slightly negative, while the hydrogen atoms are slightly positive. This polarity allows the oxygen atom of one water molecule to attract the hydrogen atom of another water molecule, forming a hydrogen bond. These hydrogen bonds create a strong cohesive force between water molecules, resulting in the high surface tension of water.

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  • 21. 

    What property of water allows it to travel through the xylem of plants?

    • Thermal

    • Cohesive

    • Solvent

    • All of the above

    • None of the above

    Correct Answer
    A. Cohesive
    Explanation
    The property of water that allows it to travel through the xylem of plants is cohesion. Cohesion is the attraction between water molecules, causing them to stick together and form a continuous column in the xylem. This cohesive force helps water to move upwards from the roots to the leaves of the plant, against gravity.

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  • 22. 

    What property of water allows it to travel from the roots of a tree to the leaves?

    • Thermal

    • Cohesive

    • Solvent

    • All of the above

    • None of the above

    Correct Answer
    A. Cohesive
    Explanation
    The property of water that allows it to travel from the roots of a tree to the leaves is its cohesive nature. Water molecules are attracted to each other through hydrogen bonding, creating a cohesive force. This cohesion allows water to form a continuous column or "water column" in the xylem vessels of a tree. As water evaporates from the leaves, more water is pulled up through the xylem due to cohesive forces, creating a continuous flow of water from the roots to the leaves.

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  • 23. 

    What property of water gives it unusually high surface tension?

    • Thermal

    • Cohesive

    • Solvent

    • All of the above

    • None of the above

    Correct Answer
    A. Cohesive
    Explanation
    Cohesion is the property of water that gives it unusually high surface tension. Cohesion refers to the attraction between water molecules, which allows them to stick together. This cohesive force creates a strong surface tension, causing water to form droplets and resist being broken apart. Thermal and solvent properties of water do not directly contribute to its surface tension.

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  • 24. 

    What property of water allows insects to walk on the surface of a lake?

    • Thermal

    • Cohesive

    • Solvent

    • All of the above

    • None of the above

    Correct Answer
    A. Cohesive
    Explanation
    The property of water that allows insects to walk on the surface of a lake is its cohesive nature. Cohesion refers to the attraction between water molecules, causing them to stick together. This cohesive force creates a thin film on the surface of the water, forming a kind of "skin" that insects can walk on without sinking. Thermal and solvent properties of water are not directly related to the ability of insects to walk on water.

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  • 25. 

    What property of water allows it to bead up on the surfaces of leaves?

    • Thermal

    • Cohesive

    • Solvent

    • All of the above

    • None of the above

    Correct Answer
    A. Cohesive
    Explanation
    The property of water that allows it to bead up on the surfaces of leaves is its cohesive nature. Cohesion is the attraction between water molecules that causes them to stick together. This cohesive force creates surface tension, which allows water to form droplets and bead up on surfaces.

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  • 26. 

    What property of water allows it to function as a transport medium in plants?

    • Thermal

    • Cohesive

    • Coolant

    • All of the above

    • None of the above

    Correct Answer
    A. Cohesive
    Explanation
    Water's cohesive property allows it to function as a transport medium in plants. Cohesion is the attraction between water molecules, which causes them to stick together. This cohesion allows water to move in a continuous column through the xylem vessels in plants, from the roots to the leaves. It also helps in the transportation of nutrients and minerals dissolved in water. Therefore, the cohesive property of water plays a crucial role in the upward movement of water and nutrients in plants.

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  • 27. 

    What property of water allows it to function as a transport medium in plants?

    • Solvent

    • Thermal

    • Coolant

    • All of the above

    • None of the above

    Correct Answer
    A. Solvent
    Explanation
    Water is able to function as a transport medium in plants because of its property as a solvent. Water has the ability to dissolve and transport various substances, such as minerals and nutrients, within the plant's vascular system. This allows for the efficient movement of these substances from the roots to the leaves and other parts of the plant. Additionally, water's polarity and cohesive properties contribute to its role as a solvent, as it can form hydrogen bonds with other molecules and maintain a continuous flow within the plant.

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  • 28. 

    What two properties of water allow it to be used as a transport medium in plants?

    • Thermal and cohesive

    • Thermal and solvent

    • Cohesive and solvent

    • All of the above

    • None of the above

    Correct Answer
    A. Cohesive and solvent
    Explanation
    Water is able to be used as a transport medium in plants due to its cohesive and solvent properties. The cohesive property of water allows it to stick to itself, forming a continuous column in the plant's xylem vessels, which helps in the upward movement of water. Additionally, water's solvent property allows it to dissolve and transport nutrients and minerals from the soil to various parts of the plant. Therefore, both cohesive and solvent properties of water are essential for its role as a transport medium in plants.

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  • 29. 

    What two properties of water allow it to be used as a transport medium in humans?

    • Thermal and cohesive

    • Cohesive and solvent

    • Thermal and solvent

    • All of the above

    • None of the above

    Correct Answer
    A. Thermal and solvent
    Explanation
    Water has the property of being a solvent, which means it can dissolve various substances such as nutrients, gases, and waste products. This makes it an ideal transport medium in humans as it can carry these dissolved substances throughout the body. Additionally, water has the property of thermal stability, which means it can absorb and release heat without significant changes in its own temperature. This allows water to help regulate body temperature, making it another important property for it to be used as a transport medium in humans.

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  • 30. 

    What property of water allows it to dissolve polar and ionic molecules?

    • Thermal

    • Cohesive

    • Solvent

    • All of the above

    • None of the above

    Correct Answer
    A. Solvent
    Explanation
    Water is known as the universal solvent because of its ability to dissolve polar and ionic molecules. This is due to its unique molecular structure, with a slightly positive charge on the hydrogen atoms and a slightly negative charge on the oxygen atom. These partial charges allow water molecules to attract and surround polar and ionic molecules, breaking them apart and dissolving them. Additionally, water's high polarity and ability to form hydrogen bonds contribute to its excellent solvent properties. Therefore, the correct answer is "Solvent."

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  • 31. 

    What type of substances dissolve in water?

    • Ionic

    • Polar

    • Charged

    • All of the above

    • None of the above

    Correct Answer
    A. All of the above
    Explanation
    All of the above substances dissolve in water. Ionic substances dissolve in water because water molecules are attracted to the charged ions in the substance, causing them to separate and disperse in the water. Polar substances dissolve in water because water is a polar molecule, with a partial positive charge on the hydrogen atoms and a partial negative charge on the oxygen atom. This allows water to form hydrogen bonds with other polar molecules, helping them dissolve. Charged substances, including both ionic and polar substances, dissolve in water because water can surround and stabilize the charged particles. Therefore, all of these types of substances can dissolve in water.

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  • 32. 

    What type of substances dissolve in water?

    • Those with covalent bonds

    • Those with polar covalent bonds

    • Those with metallic bonds

    • All of the above

    • None of the above

    Correct Answer
    A. Those with polar covalent bonds
    Explanation
    Substances that dissolve in water are those with polar covalent bonds. Water is a polar molecule, meaning it has a slight positive charge on one end and a slight negative charge on the other. Substances with polar covalent bonds have a similar charge distribution, which allows them to interact with water molecules through electrostatic attractions. This enables them to dissolve in water and form a homogeneous mixture. Substances with covalent bonds or metallic bonds do not have the necessary charge distribution to interact with water molecules in the same way, so they do not dissolve in water.

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  • 33. 

    A substance composed of what type of bonds would be expected to dissolve in water?

    • Ionic

    • Covalent

    • Metallic

    • All of the above

    • None of the above

    Correct Answer
    A. Ionic
    Explanation
    Ionic substances are composed of ions, which are charged particles. In water, the positive and negative ions of an ionic substance are attracted to the polar water molecules, causing the substance to dissolve. This is because water is a polar solvent, meaning it has a positive and negative end. The positive end of water molecules attracts the negative ions, while the negative end attracts the positive ions, allowing the substance to dissolve. Therefore, a substance composed of ionic bonds would be expected to dissolve in water.

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  • 34. 

    What type of bonds are responsible for the solvent properties of water?

    • Ionic bonds

    • Covalent bonds

    • Polar covalent bonds

    • All of the above

    • None of the above

    Correct Answer
    A. Polar covalent bonds
    Explanation
    Polar covalent bonds are responsible for the solvent properties of water. Water is a polar molecule due to the unequal sharing of electrons between the oxygen and hydrogen atoms. This polarity allows water molecules to form hydrogen bonds with other water molecules and with other polar molecules, making it an excellent solvent. Ionic bonds and covalent bonds alone do not contribute to the solvent properties of water.

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  • 35. 

    What type of bonds are responsible for the solvent properties of water?

    • Ionic bonds

    • Polar covalent bonds

    • Hydrogen bonds

    • All of the above

    • None of the above

    Correct Answer
    A. Polar covalent bonds
    Explanation
    Polar covalent bonds are responsible for the solvent properties of water because they create a partial positive charge on the hydrogen atoms and a partial negative charge on the oxygen atom. These partial charges allow water molecules to attract and interact with other polar molecules, ions, and compounds, making water an excellent solvent. Ionic bonds do not play a significant role in the solvent properties of water, and while hydrogen bonds contribute to water's unique properties, they are a specific type of polar covalent bond. Therefore, the correct answer is polar covalent bonds.

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  • 36. 

    What type of bonds are responsible for the solvent properties of water?

    • Hydrogen bonds

    • Polar covalent bonds

    • Covalent bonds

    • All of the above

    • None of the above

    Correct Answer
    A. Polar covalent bonds
    Explanation
    Polar covalent bonds are responsible for the solvent properties of water. Water is a polar molecule, meaning it has a slight positive charge on one end and a slight negative charge on the other. This polarity allows water molecules to form hydrogen bonds with other water molecules and with other polar molecules. These hydrogen bonds create a strong attraction between water molecules, making it an excellent solvent for many substances. Covalent bonds and hydrogen bonds are both types of polar covalent bonds, so the correct answer is polar covalent bonds.

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  • 37. 

    Which of the following properties of water helps glucose dissolve in it?

    • Thermal

    • Cohesive

    • Solvent

    • All of the above

    • None of the above

    Correct Answer
    A. Solvent
    Explanation
    Water is known as a universal solvent because of its ability to dissolve a wide range of substances, including glucose. The property of water being a solvent allows it to break down the bonds between the molecules of solutes, such as glucose, and surround them with water molecules. This process is facilitated by the polar nature of water molecules, which have a slight positive charge on the hydrogen atoms and a slight negative charge on the oxygen atom. This polarity allows water to form hydrogen bonds with solutes, effectively dissolving them. Therefore, the property of water being a solvent is what enables glucose to dissolve in it.

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  • 38. 

    Which of the following properties of water helps enzymes dissolve in it?

    • Thermal

    • Cohesive

    • Solvent

    • All of the above

    • None of the above

    Correct Answer
    A. Solvent
    Explanation
    Water is known as a universal solvent because it has the ability to dissolve a wide range of substances, including enzymes. This is due to its unique molecular structure, which allows it to form hydrogen bonds with other molecules. These hydrogen bonds break apart the solute particles and surround them, effectively dissolving them in the water. Therefore, the property of water as a solvent enables enzymes to dissolve in it.

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  • 39. 

    Which of the properties of water allows enzymes to catalyze reactions in it?

    • Thermal

    • Cohesive

    • Solvent

    • All of the above

    • None of the above

    Correct Answer
    A. Solvent
    Explanation
    Water is known as a universal solvent because of its ability to dissolve a wide range of substances. This property allows enzymes, which are biological catalysts, to catalyze reactions in water. Enzymes work by binding to substrates and facilitating chemical reactions. In an aqueous environment, water molecules surround the enzyme and the substrate, creating a favorable environment for the reaction to occur. The solvent property of water helps enzymes maintain their structure and stability, which is crucial for their catalytic activity. Therefore, the correct answer is "Solvent."

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  • 40. 

    Which of the properties of water allows enzymes to catalyze reactions in it?

    • Solvent

    • Polarity

    • Hydrogen-bonding

    • All of the above

    • None of the above

    Correct Answer
    A. Solvent
    Explanation
    Water is considered a universal solvent because of its ability to dissolve a wide range of substances. This property allows enzymes, which are biological catalysts, to catalyze reactions in water by providing a medium for the reactants to come into contact and interact with each other. Additionally, water's polarity and hydrogen-bonding capabilities further enhance its ability to support enzymatic reactions by facilitating the formation and stabilization of enzyme-substrate complexes. Therefore, the correct answer is "Solvent".

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  • 41. 

    Which of the properties of water allows it to be a medium for metabolic reactions?

    • Thermal

    • Cohesive

    • Solvent

    • All of the above

    • None of the above

    Correct Answer
    A. Solvent
    Explanation
    Water is able to act as a solvent because of its unique properties. Its polarity allows it to dissolve many substances, making it an excellent medium for metabolic reactions. Water's ability to dissolve and transport molecules enables chemical reactions to occur within living organisms. Therefore, the correct answer is "Solvent."

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  • 42. 

    Which of the properties of water allows it to be a medium for enzyme catalysis?

    • Thermal

    • Cohesive

    • Solvent

    • All of the above

    • None of the above

    Correct Answer
    A. Solvent
    Explanation
    Water is able to act as a medium for enzyme catalysis because of its property as a solvent. Water can dissolve many different types of molecules, including the substrates and products involved in enzyme reactions. This allows the enzymes to interact with the molecules and facilitate the chemical reactions. The thermal and cohesive properties of water are not directly related to its ability to act as a medium for enzyme catalysis.

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  • 43. 

    Which of the properties of water allows blood to transport sugar to muscle cells?

    • Thermal

    • Cohesive

    • Solvent

    • All of the above

    • None of the above

    Correct Answer
    A. Solvent
    Explanation
    Water is a solvent, meaning it has the ability to dissolve substances. In the case of blood, water acts as a solvent and helps to transport sugar molecules to muscle cells. This is because the sugar molecules can easily dissolve in the water present in the blood, allowing them to be carried throughout the body and delivered to the cells that need them. The other properties of water mentioned, thermal and cohesive, do not directly contribute to the transportation of sugar in blood.

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  • 44. 

    Which of the properties of water allows proteins to fold properly?

    • Thermal

    • Cohesive

    • Solvent

    • All of the above

    • None of the above

    Correct Answer
    A. Solvent
    Explanation
    Water is a solvent, meaning it has the ability to dissolve various substances. This property is crucial for proteins to fold properly because during the folding process, proteins interact with water molecules and form hydrogen bonds. These hydrogen bonds help stabilize the protein structure and determine its final shape. Without water as a solvent, proteins would not be able to interact with the necessary molecules and ions, leading to incorrect folding and potential loss of function. Therefore, the solvent property of water is essential for proteins to fold properly.

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  • 45. 

    Which of the properties of water allows hemoglobin to maintain its shape while carrying oxygen and carbon dioxide?

    • Thermal

    • Cohesive

    • Solvent

    • All of the above

    • None of the above

    Correct Answer
    A. Solvent
    Explanation
    Water is a solvent, meaning it has the ability to dissolve other substances. In the case of hemoglobin, water acts as a solvent and allows it to carry oxygen and carbon dioxide. The polar nature of water molecules allows it to form hydrogen bonds with the polar regions of hemoglobin, helping to maintain its shape and stability while transporting these gases. Therefore, the property of water being a solvent is what allows hemoglobin to maintain its shape while carrying oxygen and carbon dioxide.

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