Question 1

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

Accepted Answer

Cohesion due to hydrogen bonding

Question 2

What type of chemical bond is responsible for the unique properties of water, such as its high surface tension and ability to dissolve many substances?

Accepted Answer

Hydrogen bonds

Question 3

A scientist dissolves 12.0 grams of NaCl (sodium chloride) in enough water to make 250 mL of solution. What is the molarity of the solution? (Molar mass of NaCl = 58.44 g/mol)

Accepted Answer

$$0.821\ \mathrm{M}$$

Question 4

Which of the following best explains why ice floats on liquid water?

Accepted Answer

Hydrogen bonds in ice space water molecules farther apart, making ice less dense

Question 5

Which emergent property of water is most important for regulating Earth's climate?

Accepted Answer

High heat capacity

Question 6

A solution is prepared by dissolving $$9.85\ \mathrm{g} of$$ $$\mathrm{H_2SO_4} in $$enough water to make $$300.0\ \mathrm{mL} of $$solution. What is the molarity of the solution? (Molar mass of $$\mathrm{H_2SO_4} = 98.09\ \mathrm{g/mol})$$

Accepted Answer

$$0.335\ \mathrm{M}$$

Question 7

Which statement best describes the role of water's polarity in its function as a solvent?

Accepted Answer

Water's polarity enables it to form hydration shells around ions and polar molecules

Question 8

Why does the melting of Arctic ice caps accelerate regional warming?

Accepted Answer

Exposed darker surfaces absorb more solar energy, increasing warming

Question 9

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

Accepted Answer

Ability to form ionic bonds

Question 10

A student wants to prepare $$500\ \mathrm{mL} of$$ $$2.7\ \mathrm{M}$$ NaCl solution. How many grams of NaCl are required? (Molar mass of NaCl = $$58.44\ \mathrm{g/mol})$$

Accepted Answer

$$78.9\ \mathrm{g}$$

Question 11

Which of the following best describes the difference between cohesion and adhesion in water?

Accepted Answer

Cohesion is water sticking to itself; adhesion is water sticking to other surfaces

Question 12

Which of the following organisms is best adapted to survive long periods without water?

Accepted Answer

Kangaroo rat

Question 13

What is the main reason water has a high heat of vaporization?

Accepted Answer

Many hydrogen bonds must be broken for water to evaporate

Question 14

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

Accepted Answer

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

Question 15

Which property of water is most critical for the survival of aquatic organisms during winter?

Accepted Answer

Expansion upon freezing

Question 16

Which of the following statements about electronegativity is correct?

Accepted Answer

Electronegativity is the ability of an atom to attract electrons closer to itself

Question 17

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

Accepted Answer

Stable internal temperatures despite external fluctuations

Question 18

If you have $$0.15\ \mathrm{M}$$ NaCl solution, what is the mass of NaCl in $$1.0\ \mathrm{L} of $$solution? (Molar mass of NaCl = $$58.44\ \mathrm{g/mol})$$

Accepted Answer

$$8.77\ \mathrm{g}$$

Question 19

Which of the following is a result of the Arctic warming three times faster than the global average?

Accepted Answer

Continued loss of sea ice and melting of glaciers

Water and Life: Properties, Importance, and Environmental Impact

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