$$\text{moles} = \text{molarity} \times \text{volume}$$

Question 1

Which property of water allows it to move upward through the roots and stems of plants against gravity?

Accepted Answer

Cohesion and adhesion

Question 2

Water is considered a polar molecule because:

Accepted Answer

Its oxygen atom is more electronegative, creating partial charges

Question 3

Which equation correctly represents the calculation of pH?

Accepted Answer

$$pH = -\log_{10}[H^+]$$

Question 4

A solution has a hydrogen ion concentration of $$1 	imes 10$$^{-5}$$ M. What is its pH?

Accepted Answer

pH = 5

Question 5

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

Accepted Answer

Hydrogen bonds in ice create a lattice that is less dense than liquid water

Question 6

What is the main function of buffers in biological systems?

Accepted Answer

To resist changes in pH by accepting or donating $$H^+$$ ions

Question 7

Which process describes the cooling effect when water evaporates from the skin?

Accepted Answer

Evaporative cooling

Question 8

If a solution contains 0.5 moles of solute in 1 liter of solution, what is its molarity?

Accepted Answer

$$0.5\ 	ext{M}$$

Question 9

Which term describes substances that dissolve easily in water due to their affinity for water molecules?

Accepted Answer

Hydrophilic

Question 10

A buffer system in blood resists changes in pH by:

Accepted Answer

Accepting or donating $$H^+$$ ions

Question 11

Which of the following is the correct definition of specific heat?

Accepted Answer

Amount of heat required to raise the temperature of 1 gram of a substance by 1°C

Question 12

Which equation would you use to calculate the number of moles in a solution given the molarity and volume?

Accepted Answer

$$	ext{moles} = 	ext{molarity} 	imes 	ext{volume}$$

Question 13

Which of the following would increase the acidity of ocean water, contributing to ocean acidification?

Accepted Answer

Increased carbon dioxide dissolved in water

Question 14

A solution with a pH of 3 has how many times more $$H^+$$ ions than a solution with a pH of 6?

Accepted Answer

1,000 times

Question 15

Which property of water is most responsible for its ability to dissolve many substances?

Accepted Answer

Its polarity

Question 16

Which of the following best describes a colloid?

Accepted Answer

A mixture where large molecules remain suspended in water

Question 17

If you mix 10 grams of NaCl (molecular weight = 58.44 g/mol) in enough water to make 1 liter of solution, what is the molarity?

Accepted Answer

$$0.17\ 	ext{M}$$

Question 18

Which of the following is NOT a result of hydrogen bonding in water?

Accepted Answer

Water's ability to dissolve nonpolar substances

Question 19

Which term describes the energy associated with the movement of molecules?

Accepted Answer

Kinetic energy

Question 20

Which of the following best explains why sweating helps cool the human body?

Accepted Answer

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

Water and the Environment: Properties, Functions, and Biological Importance

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