Question 1

Which property of water allows a spider to walk across 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 why is this important for aquatic life in winter?

Accepted Answer

Stable hydrogen bonds in ice keep molecules farther apart, making ice less dense than liquid water.

Question 3

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

Accepted Answer

Evaporation of water absorbs heat energy due to water's high heat of vaporization.

Question 4

A solution in which water is the solvent is called a(n):

Accepted Answer

Aqueous solution

Question 5

Which of the following is NOT an emergent property of water?

Accepted Answer

High density of ice compared to liquid water

Question 6

What type of bond forms between individual water molecules?

Accepted Answer

Hydrogen bonds

Question 7

Which of the following best describes why water is an excellent solvent for ionic compounds like NaCl?

Accepted Answer

Water forms hydrogen bonds with ions, creating a hydration shell.

Question 8

Which of the following effects can occur because of the high surface tension of water?

Accepted Answer

A spider can walk across the surface of a small pond.

Question 9

Which of the following is due to the high specific heat of water?

Accepted Answer

A lake heats up more slowly than the surrounding environment.

Question 10

Which of the following reactions is most consistent with that of a base?

Accepted Answer

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

Question 11

In a neutral solution, the concentration of:

Accepted Answer

Hydrogen ions is equal to the concentration of hydroxide ions.

Question 12

Which of the following statements about buffers is true?

Accepted Answer

They maintain a consistent pH when acids or bases are added to them.

Question 13

Which of the following best describes how buffers help maintain pH in biological systems?

Accepted Answer

Buffers can both donate H+ when depleted and accept H+ when in excess.

Question 14

Which of the following best describes a hydrophobic molecule?

Accepted Answer

A nonpolar water 'fearing' molecule

Question 15

Which property of water is most responsible for the moderation of Earth's climate and the stability of aquatic environments?

Accepted Answer

High specific heat

Question 16

A student adds hydrochloric acid (HCl) to pure water. What happens to the pH and [H+] of the solution?

Accepted Answer

The pH decreases and [H+] increases.

Question 17

Which of the following best describes the relationship between temperature and kinetic energy in water molecules?

Accepted Answer

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

Question 18

Which of the following is a real-life consequence of water's lower density as a solid compared to its liquid state?

Accepted Answer

Ice floats, insulating the water below and allowing aquatic life to survive in winter.

Question 19

Which of the following best describes the role of water in dissolving table salt (NaCl)?

Accepted Answer

Water molecules surround Na+ and Cl- ions, separating them and keeping them in solution.

Properties of Water: Structure, Behavior, and Importance in Chemistry

Study Guide - Practice Questions