Question 1

Which type of bond is primarily responsible for the cohesion between individual water molecules?

Accepted Answer

Hydrogen bonds

Question 2

Which of the following is NOT an emergent property of water that is essential for life?

Accepted Answer

High density of ice compared to liquid water

Question 3

The high surface tension of water is primarily due to:

Accepted Answer

Hydrogen bonding

Question 4

Why does ice float on liquid water?

Accepted Answer

Stable hydrogen bonds keep water molecules of ice farther apart than water molecules of liquid water.

Question 5

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 6

Which property of water allows it to moderate Earth's climate and resist rapid temperature changes?

Accepted Answer

High specific heat

Question 7

Which of the following best describes the process of evaporation?

Accepted Answer

The conversion of a liquid into a vapor.

Question 8

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

Accepted Answer

Aqueous solution

Question 9

Hydrophobic molecules:

Accepted Answer

Are nonpolar water 'fearing' molecules.

Question 10

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

Accepted Answer

NaOH \rightarrow Na^+ + OH^-

Question 11

The addition of an acid like HCl to an aqueous solution (pure water) would result in:

Accepted Answer

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

Question 12

In a neutral solution, the concentration of:

Accepted Answer

Hydrogen ions is equal to the concentration of hydroxide ions.

Question 13

A base:

Accepted Answer

Is a chemical that accepts hydrogen ions from a solution.

Question 14

Buffers are important in biological systems because they:

Accepted Answer

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

Question 15

Buffers help resist shifts in pH by:

Accepted Answer

Both donating H^+ when depleted and accepting H^+ when in excess.

Question 16

Which property of water explains why sweat cools the body when it evaporates?

Accepted Answer

High heat of vaporization

Question 17

Which of the following best describes why salt (NaCl) dissolves in water?

Accepted Answer

Water forms a hydration shell around the ions, separating them.

Question 18

Which of the following best describes a homogeneous solution?

Accepted Answer

A solution where all parts are equally distributed.

Question 19

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

Accepted Answer

A drop of water forming a bead on a waxed car hood.

Question 20

Which of the following best explains why organisms can resist temperature changes, even when they give off heat due to chemical reactions?

Accepted Answer

Water’s high specific heat

Water: Structure, Properties, and Biological Importance

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