$$4\ \mathrm{L} \times 5\ \mathrm{mol/L} \times 36.5\ \mathrm{g/mol} = 730\ \mathrm{g}$$

Question 1

Which type of bond is responsible for joining the two hydrogen atoms in a molecule of H2?

Accepted Answer

Covalent bond

Question 2

Partial charges in a molecule can occur when:

Accepted Answer

Both (a) and (b).

Question 3

In the molecule shown, which atom will have the strongest partial negative charge?

Accepted Answer

The O atom that's in C=O.

Question 4

Which hypothetical change would make water more polar?

Accepted Answer

Increasing the electronegativity value of oxygen

Question 5

Hydrogen bonds:

Accepted Answer

Can form between H and N.

Question 6

Water has surface tension because:

Accepted Answer

Surface water molecules form better hydrogen bonds.

Question 7

The open spaces in water's crystal structure make it possible for:

Accepted Answer

Aquatic life to exist in a frozen pond

Question 8

What would happen to the temperature of a large lake if it contained water without hydrogen bonds?

Accepted Answer

It would heat up faster.

Question 9

Which property of water allows dogs to cool themselves by panting?

Accepted Answer

Water’s high heat of vaporization

Question 10

Why does a needle float on water, as shown in the image?

Accepted Answer

Because water has a high surface tension due to hydrogen bonding

Question 11

How would you make 1 liter of a 1M solution of glucose? (Molecular mass of glucose = 180 g/mol)

Accepted Answer

Dissolve 180 g of glucose in enough water to make 1 liter of solution

Question 12

A solution contains 2g of glucose in 500 mL of water. What is its molarity? (Molar mass of glucose = 180 g/mol)

Accepted Answer

$$0.0222\ \mathrm{M}$$

Question 13

How many grams of hydrogen chloride (HCl) are required to prepare 4 liters of 5M HCl in water? (Molar mass of HCl = 36.5 g/mol)

Accepted Answer

$$4\ \mathrm{L} 	imes 5\ \mathrm{mol/L} 	imes 36.5\ \mathrm{g/mol} = 730\ \mathrm{g}$$

Question 14

Neutral water has an $$[H^+]$$ concentration of $$10^{-7}$$\ \mathrm{M}$$. What is the pH of neutral water?

Accepted Answer

$$pH = -\log(10$$^{-7}$$) = 7$$

Question 15

What is the difference in $$[H^+]$$ concentration between lemon juice (pH 2) and household bleach (pH 13)?

Accepted Answer

The $$[H^+]$$ concentration of lemon juice is higher than that of household bleach by a factor of $$10^{11}$$

Question 16

If a buffered solution has an acid added to it, what will the buffer do in response?

Accepted Answer

Decrease hydrogen ions

Question 17

Which of the following best explains why aquatic life can survive in a frozen pond?

Accepted Answer

Ice is less dense than liquid water, so it floats and insulates the water below

Question 18

Which equation correctly represents the relationship between $$[H^+]$$ and $$[OH^-] in $$water?

Accepted Answer

$$[H^+][OH^-] = 10$$^{-14}$$\ \mathrm{M}^2$$

Question 19

Which of the following atoms can form hydrogen bonds with water molecules?

Accepted Answer

Oxygen and nitrogen

Study Guide: Water, Chemical Bonds, Molarity, and pH in Biology

Study Guide - Practice Questions