$$M = \frac{\text{moles of solute}}{\text{liters of solution}}$$

Question 1

Which property of water is primarily responsible for the ability of plants to transport water from their roots to their leaves against gravity?

Accepted Answer

Cohesion and adhesion

Question 2

A water molecule is polar because:

Accepted Answer

Oxygen is more electronegative than hydrogen, creating partial charges

Question 3

Which equation correctly represents the relationship between pH and hydrogen ion concentration $$[H^+]$$?

Accepted Answer

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

Question 4

Why does sweating help cool the human body?

Accepted Answer

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

Question 5

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

Accepted Answer

Ice has a lower density because hydrogen bonds keep water molecules farther apart

Question 6

A solution has a pH of 4. What is the hydrogen ion concentration $$[H^+] in $$this solution?

Accepted Answer

$$1 	imes 10$$^{-4}$$ M

Question 7

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

Accepted Answer

Water’s ability to form hydrogen bonds with solutes

Question 8

If the pH of a solution changes from 7 to 5, how does the hydrogen ion concentration change?

Accepted Answer

It increases by 100-fold

Question 9

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

Accepted Answer

Stable internal and external temperatures

Question 10

A lake remains liquid even when air temperatures drop below freezing. Which property of water explains this phenomenon?

Accepted Answer

Ice’s lower density, causing it to float and insulate the water below

Question 11

Which of the following best describes the process of transpiration in plants?

Accepted Answer

Water evaporates from leaves, pulling water upward from roots due to cohesion and adhesion

Question 12

Which equation would you use to calculate the molarity of a solution?

Accepted Answer

$$M = \frac{	ext{moles of solute}}{	ext{liters of solution}}$$

Question 13

Which of the following is NOT a result of water’s ability to form hydrogen bonds?

Accepted Answer

Low boiling point

Question 14

A buffer solution is important in biological systems because it:

Accepted Answer

Minimizes changes in pH when acids or bases are added

Question 15

Which of the following best explains why coastal regions tend to have milder climates than inland regions?

Accepted Answer

Water’s high specific heat moderates temperature fluctuations

Question 16

Which of the following is true about acids and bases in aqueous solutions?

Accepted Answer

Acids increase $$[H^+]$$ and bases increase $$[OH^-]$$

Question 17

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

Accepted Answer

Decreased availability of carbonate ions for marine organisms

Question 18

If a solution has a pOH of 6, what is its pH?

Accepted Answer

$$pH = 8$$

Question 19

Which of the following best describes the role of water in regulating temperature in living organisms?

Accepted Answer

Water absorbs and releases heat slowly due to its high specific heat

Question 20

Which of the following is a correct statement about hydrogen bonding in water?

Accepted Answer

Hydrogen bonds form between the hydrogen atom of one water molecule and the oxygen atom of another

Water and Life: Properties, Functions, and Biological Importance

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