Question 1

Which property of water is primarily responsible for the ability of insects, such as water striders, to walk on the surface of ponds?

Accepted Answer

High surface tension due to hydrogen bonding

Question 2

Why does ice float on liquid water?

Accepted Answer

Ice has a lower density because hydrogen bonds hold water molecules further apart in the solid state

Question 3

Which equation correctly relates pH to the concentration of hydrogen ions in solution?

Accepted Answer

$$\mathrm{pH} = -\log [\mathrm{H}^+]$$

Question 4

A solution has $$[\mathrm{H}^+] = 1 	imes 10$$^{-4}$$~\mathrm{M}. $$What is its pH?

Accepted Answer

$$\mathrm{pH} = 4$$

Question 5

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

Accepted Answer

Hydrogen bonds between water molecules require significant energy to break

Question 6

Which statement about acids and bases in aqueous solution is correct?

Accepted Answer

Acids donate $$\mathrm{H}^+$$ ions and bases accept $$\mathrm{H}^+$$ ions

Question 7

Which of the following is a consequence of water's high heat of vaporization for living organisms?

Accepted Answer

It enables evaporative cooling, helping organisms regulate body temperature

Question 8

A buffer solution is important in biological systems because it:

Accepted Answer

Maintains pH within a narrow range by donating or accepting $$\mathrm{H}^+$$ ions

Question 9

Which property of water allows it to dissolve many ionic and polar substances?

Accepted Answer

Its ability to form hydrogen bonds and its polarity

Question 10

If a lake receives acid rain, which of the following is a likely consequence for aquatic life?

Accepted Answer

Lowering of pH, which can increase solubility of toxic minerals like aluminum

Question 11

Which of the following best describes the role of hydrogen bonds in the structure of ice?

Accepted Answer

Hydrogen bonds form a lattice that spaces water molecules further apart

Question 12

Which of the following is true about the relationship between $$[\mathrm{H}^+]$$ and $$[\mathrm{OH}^-] in a $$neutral solution at 25°C?

Accepted Answer

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

Question 13

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

Accepted Answer

Evaporation of sweat removes heat due to water's high heat of vaporization

Question 14

Which of the following is a correct statement about the pH scale?

Accepted Answer

A solution with pH 3 is ten times more acidic than a solution with pH 4

Question 15

Which of the following scenarios demonstrates water's adhesive property?

Accepted Answer

Water climbing up the walls of a glass tube

Question 16

A solution has a pH of 9. Which of the following statements is true?

Accepted Answer

The solution is basic (alkaline)

Question 17

Which of the following is a real-world consequence of ocean acidification?

Accepted Answer

Decrease in carbonate ions, making it harder for marine animals to build shells and reefs

Question 18

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

Accepted Answer

Water is a polar molecule with partial positive and negative charges

Question 19

Which of the following is true about hydrophilic and hydrophobic substances?

Accepted Answer

Hydrophilic substances are polar or ionic and dissolve in water

Question 20

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

Accepted Answer

Water dissolves a wide variety of substances due to its polarity and ability to form hydrogen bonds

Water: The Source of Life – Hydrogen Bonds, Properties, and Ionization

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