Question 1

Which of the following best explains why water molecules are able to form hydrogen bonds with each other?

Accepted Answer

Water molecules are polar, with partial positive and negative charges on different atoms.

Question 2

Which of the following is NOT an emergent property of water that contributes to Earth's suitability for life?

Accepted Answer

High compressibility under pressure

Question 3

A beaker contains 1 liter of pure water at 25°C. If you add 0.01 mole of hydrochloric acid (HCl), which dissociates completely, what will happen to the pH of the solution?

Accepted Answer

The pH will decrease because the concentration of $$[H^+]$$ increases.

Question 4

Which of the following best describes the structure of a water molecule?

Accepted Answer

Two hydrogen atoms covalently bonded to one oxygen atom, with a bent shape.

Question 5

Why does ice float on liquid water?

Accepted Answer

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

Question 6

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

Accepted Answer

Its polarity and ability to form hydrogen bonds

Question 7

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

Accepted Answer

$$pH = 5$$

Question 8

Which of the following scenarios best illustrates water's ability to moderate temperature?

Accepted Answer

Sweating cools the body as water evaporates from the skin.

Question 9

What happens to the pH of a solution if the concentration of $$[OH^-]$$ increases?

Accepted Answer

The pH increases.

Question 10

Which of the following best explains why water has a high surface tension?

Accepted Answer

Hydrogen bonds between water molecules create a strong cohesive force at the surface.

Question 11

A student mixes ethanol and water. Ethanol is less polar than water. What is the most likely effect on hydrogen bonding in the mixture?

Accepted Answer

Hydrogen bonding will decrease because ethanol disrupts the hydrogen bonding network of water.

Question 12

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

Accepted Answer

Organisms are protected from sudden temperature changes due to water's ability to absorb and release heat slowly.

Question 13

Which of the following best describes the dissociation of water?

Accepted Answer

$$2H_2O \rightarrow H_3O^+ + OH^-$$

Question 14

A solution has a pH of 3. How does its hydrogen ion concentration compare to a solution with a pH of 6?

Accepted Answer

It is 1000 times higher.

Question 15

Which of the following is an example of water's adhesive property in a biological context?

Accepted Answer

Water molecules forming hydrogen bonds with the cellulose in plant cell walls.

Chapter 3 - bio 1201

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