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Unit 7 Review: Chemical Reactions

Total questions: 53

Worksheet time: 1hrs 15mins

Name
Class
Date
1.
What type of reaction occurs between an element and a compound?
Zn + 2HCl --> ZnCl2 + H2
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
2.
What kind of reaction is this:
2H2 + O2 --> 2H2O
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
3.
What kind of reaction is this:
4Fe  +  3O2 →   2Fe2O3 
a)
Synthesis
b)
Decomposition
c)
Single Replacement 
d)
Double Replacement
4.
What kind of reaction is this:
2H2O2 →2 H2O + O2
a)
Synthesis
b)
Decomposition
c)
Single Replacement 
d)
Combustion
5.
What kind of reaction is this:
2C3H7OH +9O2 -> 6CO2 + 8H2O
a)
Double Replacement
b)
Combustion
c)
Single Replacement
d)
Decomposition
6.
What kind of reaction is this:
Fe + CuSO4 -> Cu + FeSO4
a)
Double Replacement
b)
Decompostion
c)
Single Replacement
d)
Combustion
7.
The reaction below is an example of?
AgNO3 + NaCl → AgCl + NaNO3
a)
Single Replacement
b)
Double Replacement
c)
Decomposition
d)
Combustion
8.
What kind of reaction is this:
 CaCO3 + Ag2SO4 → CaSO4 + Ag2CO3 
a)
Decomposition
b)
Single Replacement
c)
Double Replacement
d)
Combustion
9.
Which type of reaction takes place in the presence of oxygen and produces carbon dioxide and water?
a)
double replacement 
b)
decomposition 
c)
combustion 
d)
single replacement
10.
What type of reaction is illustrated below?
2HI --> H2  +  I2
a)
synthesis
b)
decomposition
c)
single replacement
d)
double replacement
11.
The formula AB → A+B represents what type of chemical reaction?
a)
synthesis
b)
decomposition
c)
single displacement
d)
double replacement
12.

Al(OH)3 → Al2O3 + H2O

a)

Decomposition

b)

Combustion

c)

Synthesis

d)

Single Replacement

13.

H2 + N2 → NH3

a)

combination/synthesis

b)

decomposition

c)

single replacement reaction

d)

double replacement reaction

14.
C6H12 + 9O2 --> 6CO2 + 6H2O
a)
Synthesis
b)
Single
c)
Combustion
d)
Double
15.
AB + CD →AD + CB
a)
Double Replacement
b)
Single Replacement
c)
Synthesis
d)
Decomposition
16.

C + O2 → CO2

a)

Synthesis Reaction

b)

Decomposition Reaction

c)

Single Replacement Reaction

d)

Double Replacement Reaction

17.
Which type of reaction can be recognized by the general pattern?
A + BC--> AC + B
a)
Decomposition
b)
Combustion
c)
Single Replacement
d)
Double Replacement
18.

A + B --> AB

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

19.
A + BC →B + AC
a)
Single Replacement
b)
Decomposition
c)
Double Replacement
d)
Synthesis
20.
Two Reactants and One Product
a)
Decomposition
b)
Combination
c)
Combustion
d)
Single Replacement
21.

What does (aq) mean in a chemical reaction?

a)

precipitate

b)

insoluble

c)

aqualirious

d)

aqueous

22.

How would you indicate that a precipitate has formed in a chemical equation?

a)

(aq)

b)

(s)

c)

(p)

d)

(l)

23.

A single replacement reaction will only happen if the solid metal is ___ reactive than the metal that is dissolved in solution.

a)

less

b)

more

24.

A double replacement reaction will NOT occur unless both reactants are:

a)

in solution

b)

a solid

c)

a precipitate

d)

higher on the activity series

25.
What reaction type is characterized by the reactant breaking down as the reaction progresses?
a)
Synthesis
b)
Decomposition
c)
Combustion
d)
Double Replacement
26.

Which coefficient for Cu properly balances the reaction below?

_Cu + H2O → Cu2O + H2

a)

1

b)

2

c)

3

d)

4

27.

What is the coefficient of AgNO3 in this reaction?

_AgNO3 + H2S →Ag2S+2HNO3

a)

1

b)

2

c)

3

d)

4

28.
Which of the following can be categorized as a synthesis reaction?
a)
Ba + NaCl →BaCl2 + Na
b)
KNO3→K+ + NO3-
c)
2Li + F2 → 2LiF
d)
HCl + LiNO3 → HNO3 + LiCl
29.

Heat is a common _____ in combustion reactions.

CH4 + 2O2→ CO2 + H2O + heat

a)

reactant

b)

product

30.

What is the correct coefficient for O2 in the reaction below?

2 C4H10 + __O2→ 8 CO2 + 10 H2O

a)

18

b)

13

c)

26

d)

6

31.
What type of reaction is displayed below?
2Al + Fe2O3 → 2Fe + Al2O3
a)
Single Replacement
b)
Double Replacement
c)
Synthesis
d)
Combustion
32.
What type of reaction is characterized by two compounds switching bonding partners?
a)
Single Replacement
b)
Combustion
c)
Synthesis
d)
Double Replacement
33.

What is the correct coefficient for K3N to balance the reaction below?

3 BaO + __K3N → Ba3N2 + 3 K2O

a)

1

b)

2

c)

3

d)

6

34.
The Law of Conservation of Mass states
a)
that matter exists in all states and reacts the same
b)
that matter can only be changed into new substances by introducing a catalyst
c)
that matter exists in the same state throughout any chemical change
d)
that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants
35.
___________________ are the elements/compounds formed in a chemical reaction (on the right)
a)
Polymers
b)
Bonds
c)
Reactants
d)
Products
36.
What are the reactants in the chemical equation pictured?
a)
CH4 and CO2
b)
CH4 and O2
c)
CO2 and H2O
d)
O2 and H2O
37.
Is this balanced?...
Al + O2 --> 2Al2O3
a)
Yes!
b)
NO!
38.
Is this balanced?...
Fe + S --> FeS
a)
YES!
b)
NO!
39.

The red numbers (in front of the formulas) in the image below represent ________

a)

subscripts

b)

coefficients

c)

None of the answers are correct

40.
Evidence of a chemical reactions is anything that shows - 
a)
a new substance has formed
b)
a solid dissolved in a liquid
c)
interaction between 2 gases
d)
a change in the state of matter
41.
Which of the following describes a precipitate?
a)
a liquid forms when a block of metal is heated
b)
a solid forms when one liquid is poured into another
c)
a gas forms when a solid is placed in a liquid
d)
bubbles form when an acid is poured on a rock
42.
Which is NOT an indication of a chemical change?
a)
temperature change
b)
formation of a precipitate
c)
shape change
d)
production of light
43.
A clear liquid from a flask is poured into another clear liquid in a beaker. Which of the following results of this procedure would indicate a new substance was formed?
a)
The level of the substance in the beaker is higher after the other liquid is added.
b)
A yellow solid forms and then settles to the bottom of the beaker.
c)
Small white crystals are left behind in the flask that held the first liquid.
d)
The mass of the combined liquids is greater than either original liquid.
44.
Which of the following is an example that includes evidence of a chemical reaction?
a)
A sample of zinc is placed in water and it settles to the bottom
b)
A solid block of ice is heated and it completely melts into a liquid. 
c)
Sugar that is burned gives off an odor and turns brown and then black.
d)
A tomato is placed into a blender and chopped up into smaller pieces.
45.
A student places a piece of a potato into a container of hydrogen peroxide. One observation the student makes is that bubbles form around the potato. The presence of bubbles might indicate the formation of a new substance because bubbles - 
a)
could show that a gas is forming.
b)
always rise to the top of a liquid. 
c)
are almost always perfectly spherical.
d)
usually burst after a few minutes.
46.
Marie had a beaker with a small amount of baking soda. She added a few drops of pickle juice to the baking soda and observed fizzing and bubbling. Based on her observation, which of these can Marie determine about the new substance formed by mixing the baking soda and pickle juice?
a)
A chemical reaction produced a solid.
b)
A chemical reaction produced a gas.
c)
No chemical reaction took place.
d)
Only a physical change happened.
47.
Water boiling is a _______ change. 
a)
Physical Change 
b)
Chemical Change 
48.
Fireworks Exploding are a ________ change.
a)
Physical Change
b)
Chemical Change
49.

Sugar is dissolved into Kool Aid. What type of change is this?

a)

Chemical change

b)

Physical change

c)

Phase change

50.

What is the evidence of the chemical change seen here?

a)

Color change

b)

Light produced

c)

Phase change

51.

The blue numbers (within the formulas) in the image below represent ________

a)

subscripts

b)

coefficients

c)

None of the answers are correct

52.

Which of the following is responsible for incomplete combustion?

a)

Lack of fuel

b)

Lack of oxygen

c)

Lack of CO2

d)

Lack of H2O

53.

How does CO cause cellular death? (Select all the apply.)

a)

It binds to hemoglobin.

b)

It prevents O2 from being carried around the body on red blood cells.

c)

It causes cells to implode from within due to radioactive decay.

d)

It binds to O2 molecules in the lungs.

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