Question 1

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

Accepted Answer

Hydrogen bonds

Question 2

Why does ice float on liquid water, and why is this property important for aquatic life?

Accepted Answer

Stable hydrogen bonds in ice keep water molecules farther apart, making ice less dense than liquid water and allowing it to float, which insulates the water below.

Question 3

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

Accepted Answer

High density of ice compared to liquid water

Question 4

A spider can walk across the surface of a pond due to which property of water?

Accepted Answer

High surface tension

Question 5

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

Accepted Answer

Hydrogen bonds between water molecules absorb heat when they break and release heat when they form.

Question 6

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

Accepted Answer

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

Question 7

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

Accepted Answer

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

Question 8

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

Accepted Answer

Water is polar and can form hydration shells around many solutes.

Question 9

Which of the following solutions is considered neutral?

Accepted Answer

A solution with $$[\mathrm{H}^+] = [\mathrm{OH}^-]$$

Question 10

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

Accepted Answer

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

Question 11

Which of the following is a correct statement about hydrophobic molecules?

Accepted Answer

They are nonpolar and do not dissolve in water.

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 property of water allows lakes to resist rapid temperature changes, helping aquatic life survive seasonal shifts?

Accepted Answer

High specific heat

Question 14

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

Accepted Answer

Aqueous solution

Question 15

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

Accepted Answer

Buffers both donate and accept H+ ions to maintain pH homeostasis.

Question 16

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

Accepted Answer

Homogeneous solutions are evenly distributed, while heterogeneous solutions are unevenly distributed.

Question 17

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

Accepted Answer

Evaporation of water absorbs heat from the body due to water's high heat of vaporization.

Question 18

Which of the following statements about the pH scale is correct?

Accepted Answer

A solution with pH 7 is neutral, with $$[\mathrm{H}^+] = [\mathrm{OH}^-].$$

Question 19

Which of the following best describes the effect of adding sodium hydroxide (NaOH) to water?

Accepted Answer

It increases the concentration of hydroxide ions and decreases the concentration of hydrogen ions.

Properties of Water: Structure, Behavior, and Biological Importance

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