Chapter 9 - Chemical Reactions

Question 1

Is it a chemical reaction? A tomato smells rotten.

Answer 1

Yes

Question 2

Is it a chemical reaction? A drinking glass breaks into smaller pieces.

Answer 2

No

Question 3

Is it a chemical reaction? A piece of ice melts.

Answer 3

No

Question 4

Is it a chemical reaction? Drain cleaner is mixed with water and the solution becomes warm.

Answer 4

Yes

Question 5

Is it a chemical reaction? Candle wax burns.

Answer 5

Yes

Question 6

Is it a chemical reaction? Molten candle wax solidifies.

Answer 6

No

Question 7

Is it a chemical reaction? Green leaves turn yellow and red as the seasons change.

Answer 7

Yes

Question 8

Is it a chemical reaction? Baking powder produces a gas that makes cake rise.

Answer 8

Yes

Question 9

Solid mercury(II) oxide breaks down when heated, forming the elements mercury and oxygen.

Answer 9

2 HgO(s) -> 2Hg + O(g)

Question 10

Sodium metal reacts with water vapor in air to form solid sodium hydroxide and hydrogen.

Answer 10

2Na(s) + 2H2O(g) -> 2NaOH(s) + H2(g)

Question 11

In the first step of refining zinc metal from its zinc sulfide ore, the ore is heated in the presence of oxygen. The
products are solid zinc oxide and sulfur dioxide gas.

Answer 11

2ZnS(s) + 3O2(g) -> 2ZnO(s) + 2SO2(g)

Question 12

The next step of refining zinc involves heating the zinc oxide in the presence of carbon. This reaction produces zinc
vapor and carbon monoxide gas.

Answer 12

ZnO(s) + C(s) -> ZN(g) + CO(g)

Question 13

Certain pollutants in the air react with water vapor to form acids. For example, sulfur trioxide reacts with water
vapor to form sulfuric acid.

Answer 13

SO3 + H2O -> H2SO4

Question 14

Solid calcium carbonate is commonly used in antacids because it reacts with the hydrochloric acid found in the
stomach. The products of this reaction are aqueous calcium chloride, carbon dioxide, and water.

Answer 14

CaCO3(s) + 2HCl2(aq) + CO2(g) + H2O(l)

Question 15

What type of reaction is this?
Q + XZ → X + QZ

Answer 15

single-replacement

Question 16

What type of reaction is this?
Q + Z → QZ

Answer 16

synthesis

Question 17

What type of reaction is this?
Q + Z → QZ

Answer 17

decomposition

Question 18

What type of reaction is this?

Answer 18

double-replacement

Question 19

A spoonful of sodium chloride is dissolved in a liter of water. What is sodium chloride in this solution?

Answer 19

solute

Question 20

In an aqueous solution, water is the

Answer 20

solvent

Question 21

Compounds that produce hydrogen ions in aqueous solutions are

Answer 21

acids

Question 22

What type of reaction occurs between ions present in aqueous solution?

Answer 22

double-replacement

Question 23

What type of ions are present in solution but are not actually involved in a chemical reaction?

Answer 23

spectator

Question 24

If hydrochloric acid and potassium hydroxide react, what is the product of the net ionic equation for the reaction?

Answer 24

water

Question 25

Which of the following gases is not commonly produced in a double-replacement reaction?

Answer 25

hydrogen cyanide

Question 26

H+(aq) + Br−(aq) + K+(aq) + OH−(aq) → H2O(l) + Br−(aq) + K+(aq) is an example of what type of chemical equation?

Answer 26

complete ionic

Question 27

Aluminum lawn furniture becomes coated with a layer of aluminum
oxide when it sits out in the air.

Answer 27

synthesis

Question 28

Chlorine gas is bubbled through a calcium bromide solution. The
solution turns brown, the color of bromine.

Answer 28

single-replacement

Question 29

Lime is added to acid water in a lake. Water and a salt form.

Answer 29

double-replacement

Question 30

Propane is a common household fuel. When burned, water and
carbon dioxide are produced.

Answer 30

combustion

Question 31

Steel wool burns, forming an iron oxide.

Answer 31

synthesis

Question 32

When an electric current is passed through molten potassium
bromide, potassium and bromine form.

Answer 32

decomposition

Question 33

When solutions of sodium iodide and lead nitrate are combined, a
yellow solid forms.

Answer 33

double-replacement