Question 1

Which property of water allows insects to walk on its surface without sinking?

Accepted Answer

Surface tension due to hydrogen bonding between water molecules.

Question 2

A solution with a pH of 4 has how many times more hydrogen ions than a solution with a pH of 7?

Accepted Answer

$$1000$$

Question 3

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

Accepted Answer

A large amount of energy is required to break hydrogen bonds between water molecules.

Question 4

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

Accepted Answer

Cohesion and adhesion allow water to move against gravity in plants.

Question 5

What happens to the temperature of water as it absorbs heat energy, but remains at 100°C during boiling?

Accepted Answer

The temperature remains constant as energy is used to break hydrogen bonds during the phase change.

Question 6

Which of the following best describes a buffer in a biological system?

Accepted Answer

A substance that minimizes changes in pH by accepting or donating H$$^+ or OH$^-$$ ions.

Question 7

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

Accepted Answer

$$NaOH \rightarrow Na^+ + OH^-$$

Question 8

Which of the following statements about hydrophilic and hydrophobic substances is correct?

Accepted Answer

Hydrophilic substances are polar and dissolve easily in water.

Question 9

Which of the following best explains why water is called the 'universal solvent'?

Accepted Answer

Water's polarity allows it to dissolve many ionic and polar substances.

Question 10

Which of the following is true about the pH scale?

Accepted Answer

A solution with a pH of 7 is neutral because $$[H^+] = [OH^-].$$

Question 11

Which of the following best describes the effect of adding an acid to pure water?

Accepted Answer

It increases the concentration of $$H^+$$ ions and decreases the pH.

Question 12

Which of the following is a direct result of water's high heat of vaporization?

Accepted Answer

Evaporation of sweat cools the body by absorbing a large amount of heat.

Question 13

Which of the following best describes the molecular structure of water?

Accepted Answer

A polar molecule with two hydrogen atoms covalently bonded to one oxygen atom.

Question 14

Which of the following is NOT a property of water that results from hydrogen bonding?

Accepted Answer

Water's low boiling point.

Question 15

Which of the following best explains why lakes and oceans help moderate Earth's climate?

Accepted Answer

Water's high specific heat allows it to absorb and release large amounts of heat with little temperature change.

Question 16

Which of the following statements about buffers is true?

Accepted Answer

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

Question 17

Which of the following best describes the difference between a homogeneous and a heterogeneous solution?

Accepted Answer

A homogeneous solution has uniform composition throughout, while a heterogeneous solution does not.

Question 18

Which of the following best describes the role of hydrogen bonds in water's properties?

Accepted Answer

They are responsible for water's cohesion, adhesion, high specific heat, and surface tension.

Question 19

Which of the following is true about acids and bases in aqueous solutions?

Accepted Answer

Acids increase the concentration of $$H^+$$ ions, while bases decrease it.

Properties of Water: Structure, Behavior, and Chemical Relevance

Study Guide - Practice Questions