MC questions

Question 1

Water’s special qualities depend largely on which of its following characteristics?
(a) very strong covalent bonds between hydrogen
and oxygen
(b) hydrogen bonds that form between water
molecules
(c) weak covalent bonds that form between water
molecules
(d) very strong hydrogen bonds that form between
hydrogen and oxygen within water molecules

Answer 1

(b) hydrogen bonds that form between water
molecules

Question 2

Which of the following best explains the cleaning
action of soaps and detergents?
(a) The positive cation and negative anion attach to
both polar and non-polar substances.
(b) The polar and non-polar ends of the anion attach to both polar and non-polar substances.
(c) The positive and negative ends of the anion attach to both polar and non-polar substances.
(d) The polar and non-polar ends of the cation attach to both polar and non-polar substances.

Answer 2

(b) The polar and non-polar ends of the anion attach to both polar and non-polar substances.

Question 3

true or false

When one liquid dissolves in another, the liquid with the greater molar mass is considered to be the solvent.

Answer 3

False. When one liquid dissolves in another, the liquid with the greater volume is considered
to be the solvent.

Question 4

true or false

When you add extra solute to an already saturated
solution, the extra solute becomes supersaturated.

Answer 4

False. When you add extra solute to an already saturated solution, the extra solute does not
dissolve.

Question 5

true or false

A supersaturated solution contains more solute than the solvent can usually hold at a given temperature.

Answer 5

true

Question 6

true or false

When solute is added to a solution, the concentration of the solution decreases.

Answer 6

False. When solute is added to a solution, the concentration of the solution increases.

Question 7

true or false

Comparing a strong acid and a weak acid with the
same concentration, the weak acid will have a higher pH.

Answer 7

true

Question 8

true or false

Bromothymol blue changes colour at pH 7.0.

Answer 8

true

Question 9

true or false

The pH of the solution being titrated changes
gradually near the equivalence point.

Answer 9

False. The pH of the solution being titrated changes rapidly near the equivalence point.

Question 10

The fact that water is a liquid at room temperature
suggests which of the following? (8.1) k/U
(a) The forces between atoms in a water molecule are relatively strong.
(b) The forces between atoms in a water molecule are relatively weak.
(c) The forces between water molecules are relatively strong.
(d) The forces between water molecules are relatively weak.

Answer 10

(c) The forces between water molecules are relatively strong.

Question 11

Which of the following statements is true? (10.2)
(a) Ionic compounds ionize; molecular compounds
dissociate.
(b) Ionic compounds dissociate; molecular
compounds ionize.
(c) Ionic compounds both dissociate and ionize;
molecular compounds dissociate only.
(d) Ionic compounds and molecular compounds
both ionize and dissociate.

Answer 11

(b) Ionic compounds dissociate; molecular
compounds ionize.

Question 12

true or false

Ions that do not actively participate in a reaction are called spectator ions.

Answer 12

true

Question 13

Which kind of bonding is responsible for most of the special characteristics of water?

Answer 13

Hydrogen bonding is responsible for most of the special characteristics of water.

Question 14

A solution contains 51 mL of ethanol and 49 mL of
propanone. Which substance is the solvent? Explain.

Answer 14

The solvent is ethanol because there is a greater volume of ethanol present.

Question 15

What process do ionic compounds undergo as they dissolve in water?

Answer 15

When dissolved in water, ionic compounds undergo the process of dissociation.

Question 16

A liquid solvent at 20 °C holds more solute than the same solvent at 30 °C. What can you conclude about the solute?

Answer 16

Since the solvent at a lower temperature holds more solute, we can conclude that the solute is
a gas. The solubility of gases decreases as the temperature increases.

Question 17

Name two types of substances that tend not to
dissolve in water.

Answer 17

Two substances that tend not to dissolve in water are non-polar substances and ionic
compounds that are only slightly soluble.

Question 18

Which kind of equation identifies highly soluble
compounds written in their dissociated ionic form?

Answer 18

The total ionic equation identifies highly soluble compounds written in their dissociated ionic
form.

Question 19

Which kind of equation identifies only the entities that actually react and change in an equation?

Answer 19

net ionic equation

Question 20

In the presence of phenolphthalein indicator, what
colours do you expect to see with acids and bases?

Answer 20

In the presence of phenolphthalein indicator, acids are colourless and bases are pink.

Question 21

HClO4(aq)

Answer 21

HClO4(aq) is perchloric acid.

Question 22

chlorous acid

Answer 22

HClO2(aq).

Question 23

A metal and an acid react in a test tube. What
observation would you expect to make?

Answer 23

When a metal and an acid react, you would expect to see bubbles of hydrogen gas.

Question 24

What process describes a compound separating
into its ions as it dissolves in water?

Answer 24

Dissociation is the process during which a compound separates into ions as it dissolves in
water.

Question 25

What process describes uncharged particles
reacting with water and becoming ions?

Answer 25

Ionization occurs when uncharged particles react with water and become ions.

Question 26

Which would ionize more completely in water, a
strong acid like hydrochloric acid or a weak acid like phosphoric acid?

Answer 26

A strong acid like hydrochloric acid would ionize more completely in water than a weak
acid.

Question 27

Which would conduct electricity better, a strong acid like sulfuric acid or a weak acid like ethanoic acid?

Answer 27

A strong acid like sulfuric acid would conduct electricity better than a weak acid.

Question 28

What analytical process is used to find the
concentration of an unknown solute in a solution?

Answer 28

Titration is the analytical process used to find the concentration of an unknown solute in a
solution.

Question 29

Will hexane, C6H14(l), dissolve in water? Explain why or why not.

Answer 29

Since hexane is a covalent compound that is non-polar, it will not dissolve in water. The
polar ends of water molecules are not attracted to hexane, so hexane is unable to break up
water’s hydrogen bond network.

Question 30

A piece of metal is dropped into hydrochloric acid.
(10.1)
(a) Will a reaction necessarily take place?

Answer 30

A reaction will take place if the metal is higher than hydrogen in the activity series.

Question 31

Describe the difference between a strong acid and a weak acid.

Answer 31

The difference between a strong acid and a weak acid is the degree to which they ionize in
water.

A strong acid completely ionizes because all of its molecules react to form ions when they
dissolve in water.

A weak acid only partially ionizes because some of its molecules remain intact. Only a small percentage of the molecules form ions.

Question 32

Explain why strong acids conduct electricity better
than weak acids, assuming that the two acids are at equal concentrations.

Answer 32

Strong acids conduct electricity better than weak acids because they ionize completely.

Weak acids only partially ionize. This means that a strong acid will have a higher concentration of ions
in the solution.

Since ions conduct electricity, the greater the concentration of ions, the better the
substance conducts electricity.