Unit 13

Question 1

The freezing point and the boiling point of water can be altered by a variety of techniques. Which of the following has little or no effect on the boiling point of water?

a. Increasing the air pressure above the liquid
b. Adding alcohol to the water
c. Adding sodium chloride to the water
d. Increasing the amount of water

Answer 1

D. Increasing the amount of water

Question 2

What’s the dissolving medium in a solution?

Answer 2

Solvent

Question 3

A solute depresses the freezing point because the solute ____.

a. is colder than the solvent
b. disrupts crystal formation of the solvent
c. tends to sink to the bottom of the solution
d. has bigger molecules than the solvent

Answer 3

B.

Question 4

To which of the following variables is change in boiling point directly proportional?

a. molarity of solution
b. molality of solution
c. percent by volume of solution
d. percent (mass/mass) of solution

Answer 4

B.

Question 5

The bonds between adjacent water molecules are called ____.

a. hydrogen bonds
b. ionic bonds
c. nonpolar covalent bonds
d. polar covalent bonds

Answer 5

A.

Question 6

The bonds between the hydrogen and oxygen atoms in a water molecule are ____.
polar covalent bonds

a. hydrogen bonds
b. ionic bonds
c. nonpolar covalent bonds
d. polar covalent bonds

Answer 6

D.

Question 7

Which is responsible for the high thermal energy required to melt ice?

a. covalent bonding
b. dispersion forces
c. hydrogen bonding
d. ionic attractions

Answer 7

C.

Question 8

What type of compound is always an electrolyte?

a. polar covalent
b. nonpolar covalent
c. ionic
d. network solid

Answer 8

C, only ionic solutions/ compounds are conductive

Question 9

Which of the following expressions is generally used for solubility?

a. grams of solute per 100 grams of solvent
b. grams of solute per 100 milliliters of solvent
c. grams of solute per 100 grams of solution
d. grams of solute per 100 milliliters of solution

Answer 9

A.