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?

Accepted Answer

Ice has a lower density than liquid water because hydrogen bonds keep water molecules further apart in the solid state.

Question 3

Which of the following best explains why water has a high specific heat?

Accepted Answer

Hydrogen bonds between water molecules require more energy to break, so water resists temperature changes.

Question 4

A student adds NaOH to water. Which equation best represents the chemical change that occurs?

Accepted Answer

$$\mathrm{NaOH} \rightarrow \mathrm{Na}^+ + \mathrm{OH}^-$$

Question 5

Which of the following statements about buffers is TRUE?

Accepted Answer

Buffers resist changes in pH when both acids and bases are added to a solution.

Question 6

Which property of water is most important for regulating Earth's climate and supporting life in aquatic environments?

Accepted Answer

Water's high specific heat

Question 7

What is the main reason water is considered the 'universal solvent'?

Accepted Answer

Water is polar and can dissolve many ionic and polar substances.

Question 8

Which of the following best describes a hydrophobic molecule?

Accepted Answer

A molecule that does not dissolve in water because it is nonpolar.

Question 9

A solution has a pH of 3. Which of the following statements is correct?

Accepted Answer

The concentration of $$[\mathrm{H}^+] is $$greater than the concentration of $$[\mathrm{OH}^-].$$

Question 10

Which of the following is an emergent property of water that is essential for life on Earth?

Accepted Answer

Water's high surface tension

Question 11

Which of the following best explains why lakes and oceans do not freeze solid in winter?

Accepted Answer

Ice floats on liquid water, forming an insulating layer that reduces heat loss.

Question 12

Which of the following statements about acids and bases is correct?

Accepted Answer

Bases decrease the concentration of $$[\mathrm{H}^+] in $$solution.

Question 13

Which of the following is TRUE about the pH scale?

Accepted Answer

A solution with pH 7 is neutral.

Question 14

Which of the following best describes the role of hydrogen bonds in water's high heat of vaporization?

Accepted Answer

Hydrogen bonds require more energy to break, so more heat is needed for water to vaporize.

Question 15

A buffer system in blood helps maintain pH by:

Accepted Answer

Donating $$\mathrm{H}^+$$ ions when the solution becomes too basic and accepting $$\mathrm{H}^+$$ ions when it becomes too acidic.

Question 16

Which of the following is a consequence of water's high specific heat for living organisms?

Accepted Answer

Organisms are protected from drastic temperature fluctuations.

Question 17

Which of the following best describes a homogeneous solution?

Accepted Answer

A solution in which all parts are equally distributed.

Question 18

Which of the following is TRUE about the relationship between temperature and kinetic energy in water?

Accepted Answer

As temperature increases, the average kinetic energy of water molecules increases.

Question 19

Which of the following best explains why water is able to dissolve ionic compounds like NaCl?

Accepted Answer

Water molecules are polar and surround the positive and negative ions, separating them.

Question 20

Which of the following would result from adding HCl to pure water?

Accepted Answer

Both the release of $$\mathrm{H}^+$$ and a decrease in pH.

Properties of Water: Structure, Behavior, and Chemical Relevance in General Chemistry

Study Guide - Practice Questions