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

Which of the following best describes the interaction between water molecules that leads to cohesion?

Accepted Answer

Hydrogen atoms on H$$_2O $$molecules form hydrogen bonds with oxygen atoms on adjacent H$$_2O $$molecules.

Question 3

A lake heats up more slowly than the surrounding land during summer. Which property of water explains this phenomenon?

Accepted Answer

High specific heat

Question 4

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

Accepted Answer

Water forms hydrogen bonds with polar and ionic compounds, allowing them to dissolve.

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 happens to the hydrogen ion concentration $$[H^+]$$ and pH when hydrochloric acid (HCl) is added to pure water?

Accepted Answer

Both the release of $$H^+$$ and a decrease in pH

Question 7

Which equation best represents the dissociation of sodium hydroxide (NaOH) in water, acting as a base?

Accepted Answer

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

Question 8

Which of the following statements about buffers is correct?

Accepted Answer

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

Question 9

In a neutral aqueous solution, which relationship is true?

Accepted Answer

The concentration of $$\mathrm{H}^+ is $$equal to the concentration of $$\mathrm{OH}^-.$$

Question 10

Which property of water is most important for maintaining homeostasis in living organisms?

Accepted Answer

High specific heat

Question 11

What is the effect of adding a base to an aqueous solution?

Accepted Answer

Increasing the concentration of hydroxide ions and decreasing the concentration of hydrogen ions

Question 12

Which of the following best describes hydrophobic molecules?

Accepted Answer

Nonpolar, water 'fearing' molecules that do not dissolve in water

Question 13

Which property of water is responsible for its ability to dissolve table salt (NaCl)?

Accepted Answer

Water's polarity and ability to form hydration shells around ions

Question 14

Which emergent property of water is most directly responsible for the moderation of Earth's climate?

Accepted Answer

High specific heat

Question 15

A solution in which water is the solvent is called:

Accepted Answer

Aqueous solution

Question 16

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 17

Which of the following best describes the role of buffers in blood?

Accepted Answer

Buffers maintain pH homeostasis by accepting or donating $$H^+$$ ions as needed.

Question 18

Which property of water is most important for evaporative cooling, such as sweating?

Accepted Answer

High heat of vaporization

Water: Structure, Properties, and Its Role in Biological and Chemical Systems

Study Guide - Practice Questions