Question 1

Which of the following best explains why water (H$$_2O) is $$considered a polar molecule?

Accepted Answer

Because oxygen is highly electronegative and pulls electrons closer to itself.

Question 2

What type of bond forms between water molecules due to their polarity?

Accepted Answer

Hydrogen bond

Question 3

Which property of water allows it to move as a group when one molecule is moved, as described in the notes?

Accepted Answer

Cohesion

Question 4

In the context of pH, which solution contains the highest concentration of hydrogen ions (H$$^+$$)?

Accepted Answer

Acidic solution

Question 5

Given the following pH-related equation, which describes the relationship between hydrogen ion concentration and pH?

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

Accepted Answer

As [H$$^+$$] increases, pH decreases.

Question 6

Why does oxygen in a water molecule attract electrons more strongly than hydrogen?

Accepted Answer

Oxygen is more electronegative.

Question 7

Which of the following best describes a basic solution as depicted in the notes?

Accepted Answer

It contains more OH$$^-$$ ions than H$$^+$$ ions.

Question 8

If you add an acid to pure water, what happens to the concentration of H$$^+$$ ions?

Accepted Answer

It increases.

Question 9

Which of the following real-life scenarios best illustrates the concept of hydrogen bonding in water?

Accepted Answer

Water droplets forming on a spider web

Question 10

A student claims that in a neutral solution, the concentration of H$$^+$$ ions is greater than that of OH$$^-$$ ions. Is this correct?

Accepted Answer

No, because in a neutral solution, [H$$^+$$] = [OH$$^-$$].

Question 11

Which of the following best explains why water is an excellent solvent for ionic compounds?

Accepted Answer

Water's polarity allows it to surround and separate ions.

Question 12

Which of the following is a direct result of water's ability to form hydrogen bonds?

Accepted Answer

Water has a high surface tension.

Question 13

If a solution has a pH of 3, what can you infer about its [H$$^+$$] compared to a solution with pH 7?

Accepted Answer

It has 10,000 times more [H$$^+$$].

Question 14

Which of the following best describes the movement of water molecules due to hydrogen bonding?

Accepted Answer

They move together, so when one moves, others follow.

Water, pH, and Hydrogen Bonding: Study Notes for Biology

Study Guide - Practice Questions