Question 1

Which property of water allows a water strider (an insect) to walk on the surface of a pond without sinking?

Accepted Answer

Surface tension due to hydrogen bonding

Question 2

Why does ice float on liquid water, and why is this important for aquatic life in lakes during winter?

Accepted Answer

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

Question 3

A patient is suffering from heat stroke after running a marathon. Which property of water is most relevant to the body's ability to cool itself through sweating?

Accepted Answer

High heat of vaporization

Question 4

Which of the following best explains why water is an excellent solvent for ionic compounds like NaCl?

Accepted Answer

Water molecules form hydration shells around ions due to their polarity.

Question 5

A solution has a pH of 4. Which of the following statements is true about this solution?

Accepted Answer

It is acidic and has a higher concentration of H$$^+$$ ions than OH$$^-$$ ions.

Question 6

Which of the following reactions represents the action of a base in water?

Accepted Answer

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

Question 7

Which property of water helps moderate Earth's climate and stabilize temperatures in organisms?

Accepted Answer

High specific heat

Question 8

A buffer system in blood helps maintain pH homeostasis. How does a buffer work when excess H$$^+$$ ions are added to the blood?

Accepted Answer

It accepts H$$^+$$ ions to minimize pH change.

Question 9

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

Accepted Answer

Homogeneous solutions have components that are uniformly distributed.

Question 10

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

Accepted Answer

High density of ice compared to liquid water

Question 11

Which of the following best explains why oil does not dissolve in water?

Accepted Answer

Oil is nonpolar and hydrophobic, while water is polar.

Question 12

If you add hydrochloric acid (HCl) to pure water, what happens to the pH and the concentration of H$$^+$$ ions?

Accepted Answer

The pH decreases and [H$$^+$$] increases.

Question 13

Which of the following is a real-life example of water’s high specific heat capacity?

Accepted Answer

A lake heats up more slowly than the surrounding land during a hot day.

Question 14

Which of the following best describes the role of buffers in biological systems?

Accepted Answer

Buffers resist changes in pH by donating or accepting H$$^+$$ ions as needed.

Question 15

Which of the following statements about acids and bases is correct?

Accepted Answer

Acids increase the concentration of H$$^+$$ ions in solution.

Question 16

Which of the following best describes the molecular interaction responsible for water’s cohesion?

Accepted Answer

Hydrogen bonds between adjacent water molecules

Question 17

A solution in which water is the solvent is called:

Accepted Answer

An aqueous solution

Question 18

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

Accepted Answer

Evaporation of water absorbs heat due to water’s high heat of vaporization.

Question 19

Which of the following is true about the pH scale?

Accepted Answer

A solution with pH 2 has a higher concentration of H$$^+$$ than a solution with pH 10.

Question 20

Which of the following best describes a hydrophilic substance?

Accepted Answer

A polar or charged molecule that dissolves in water

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

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