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 in liquid water, and why is this important for aquatic life?

Accepted Answer

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

Question 3

A student adds table salt (NaCl) to water. What happens at the molecular level?

Accepted Answer

Water molecules form a hydration shell around Na+ and Cl- ions, separating them.

Question 4

Which equation best represents the dissociation of hydrochloric acid (HCl) in water?

Accepted Answer

$$\mathrm{HCl} \rightarrow \mathrm{H}^+ + \mathrm{Cl}^-$$

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 is the main reason water has a high specific heat?

Accepted Answer

Hydrogen bonds must be broken before water can change temperature

Question 7

Which of the following best describes a buffer’s function in blood?

Accepted Answer

Buffers maintain a consistent pH by donating or accepting $$\mathrm{H}^+$$ ions as needed.

Question 8

Which of the following solutions is considered neutral?

Accepted Answer

pH = 7, $$[\mathrm{H}^+] = [\mathrm{OH}^-]$$

Question 9

Which property of water is most responsible for its ability to dissolve salts and polar compounds?

Accepted Answer

Water’s polarity

Question 10

A solution in which water is the solvent is called:

Accepted Answer

Aqueous solution

Question 11

Which of the following effects is due to water’s high heat of vaporization?

Accepted Answer

Evaporation of sweat cools the body

Question 12

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

Accepted Answer

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

Question 13

Which of the following statements about hydrophobic molecules is correct?

Accepted Answer

They are nonpolar and do not dissolve in water

Question 14

What happens to the pH of a solution when an acid is added?

Accepted Answer

The pH decreases as $$[\mathrm{H}^+]$$ increases

Question 15

Which property of water allows it to resist temperature changes, helping organisms maintain homeostasis?

Accepted Answer

High specific heat

Question 16

Which of the following best describes the function of buffers in living organisms?

Accepted Answer

Buffers resist changes in pH by donating or accepting $$\mathrm{H}^+$$ ions

Question 17

Which of the following is a real-life example of water’s cohesive property?

Accepted Answer

Leaves pull water upward from the roots

Question 18

Which equation best represents the bicarbonate buffer system in blood?

Accepted Answer

$$\mathrm{H}^+ + \mathrm{HCO}_3^- \leftrightarrow \mathrm{H}_2\mathrm{CO}_3$$

Question 19

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

Accepted Answer

Higher temperature means higher average kinetic energy

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

Study Guide - Practice Questions