Question 1

Which property of water allows insects such as water striders to walk on the surface of a pond without sinking?

Accepted Answer

Surface tension due to hydrogen bonding

Question 2

Why does ice float on liquid water, and what is the molecular explanation for this phenomenon?

Accepted Answer

Ice is less dense than water because hydrogen bonds keep water molecules farther apart in the solid state

Question 3

A salt such as NaCl dissolves easily in water. Which property of water is primarily responsible for this?

Accepted Answer

Water's versatility as a solvent due to its polarity

Question 4

Which of the following best explains why sweating cools the human body?

Accepted Answer

Evaporation of sweat absorbs heat as hydrogen bonds break

Question 5

Which statement correctly describes the difference between cohesion and adhesion in water?

Accepted Answer

Cohesion is water's ability to stick to itself; adhesion is water's ability to stick to other substances

Question 6

Which of the following is a direct consequence of water's high specific heat?

Accepted Answer

Water can absorb or release large amounts of heat with only a slight change in its own temperature

Question 7

A biologist observes that a plant can draw water up from its roots to its leaves. Which combination of water's properties is most directly responsible for this process?

Accepted Answer

Cohesion and adhesion

Question 8

Which of the following best explains why oil does not dissolve in water?

Accepted Answer

Oil is non-polar and water is polar, so water cannot form hydrogen bonds with oil molecules

Question 9

If a lake freezes in winter, why is it important for aquatic life that only the surface freezes while the water below remains liquid?

Accepted Answer

The ice insulates the water below, preventing the entire lake from freezing solid and allowing aquatic life to survive

Question 10

Which of the following best describes the partial charges in a water molecule?

Accepted Answer

The oxygen atom has a partial negative charge, and the hydrogen atoms have partial positive charges

Question 11

A scientist adds a small amount of salt to a beaker of water and observes that it dissolves completely. Which property of water is being demonstrated, and what is the molecular basis for this property?

Accepted Answer

Versatility as a solvent; water's polarity allows it to surround and separate ions

Question 12

Which of the following equations best represents the energy required to change the temperature of a given mass of water?

Accepted Answer

$$Q = m c \Delta T$$

Question 13

During a hot day, a dog pants to cool itself. Which property of water is most directly involved in this cooling process?

Accepted Answer

Ability to moderate temperature due to high heat of vaporization

Question 14

Which of the following best explains why water has a high surface tension compared to most other liquids?

Accepted Answer

Hydrogen bonds between water molecules create a strong cohesive force at the surface

Question 15

A student mixes sugar into water and observes that it dissolves. Which property of water is responsible for this, and what type of bond is involved between water and sugar molecules?

Accepted Answer

Versatility as a solvent; hydrogen bonds form between water and polar regions of sugar

Question 16

Which of the following scenarios best illustrates the concept of adhesion?

Accepted Answer

Water droplets sticking to the inside of a glass after it is emptied

Question 17

Which of the following is NOT a direct result of hydrogen bonding in water?

Accepted Answer

Water's ability to dissolve non-polar substances

Question 18

If the temperature of a body of water is lower, what happens to the amount of heat it can absorb before its temperature rises?

Accepted Answer

It can absorb more heat before its temperature rises due to water's high specific heat

Question 19

Which of the following best describes the type of bond formed between two water molecules?

Accepted Answer

Hydrogen bond

Question 20

A scientist is studying the movement of water through plant roots and up the stem. Which property of water is LEAST involved in this process?

Accepted Answer

Expansion upon freezing

Properties of Water: Structure, Behavior, and Biological Importance

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