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Gen Chem Unit 8 Balancing Reactions Test Review

Total questions: 33

Worksheet time: 36mins

Name
Class
Date
1.
4Si + S8 --> 2Si2S4
a)
Synthesis
b)
Decomposition
c)
Single displacement
d)
Double displacement
2.
3Ca + 2AlCl3 --> 3CaCl2 + 2Al
a)
Synthesis
b)
Decomposition
c)
Single diplacement
d)
Double displacement
3.
3KOH + H3PO4 --> K3PO4 + 3H2O
a)
Synthesis 
b)
Decomposition
c)
Single displacement
d)
Double displacement
4.
2Pb(NO3)2 --> 2PbO + 4NO2 + O2
a)
Synthesis 
b)
Decomposition
c)
Single displacement
d)
Combustion
5.
3Mg + N2 --> Mg3N2
a)
Synthesis 
b)
Decomposition
c)
Single displacement
d)
Combustion
6.
2NO2 --> N2 + 2O2
a)
Synthesis
b)
Decomposition
c)
Single displacement
d)
Combustion
7.
P4 + 3O2 --> 2P2O3
a)
Synthesis 
b)
Decomposition
c)
Single displacement
d)
Combustion
8.
Fe + H2SO4 --> Fe2(SO4)3 + H2
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Combustion
9.
Which reaction type is the following: C5H10O4 + O2 --> CO2 + H2O
a)
Decomposition
b)
Single Replacement
c)
Combustion
d)
Double Replacement
10.
What coefficient should be used to make the following equation balanced?
N2+O2--> _NO 
a)
1
b)
2
c)
3
d)
4
11.
Balance this equation:
 __Li + __Cl2 -> __LiCl
a)
2Li + Cl2 -> 4LiCl2
b)
2Li + Cl2 -> LiCl2
c)
2Li +  Cl2 -> 2LiCl
12.
C4H12 + O2 --> CO2 + H2O
a)
Synthesis
b)
Combustion
c)
Single Replacement
d)
Double Replacement
13.
PbCl2 + AgNO3 ---> Pb(NO3)2 + AgCl 
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
14.
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
a)
the product is doubled
b)
the product is half the mass of the reactants
c)
the mass is the same
d)
the mass changes depending on the reaction
15.

The law of conservation states that the mass of the reactants is _______ the mass of the products.

a)

greater than

b)

less than

c)

equal to

16.

In what state is this substance?

a)

solid precipitate

b)

dissolved in water

c)

released as a gas

d)

liquid

17.
Which chemical reaction takes place when 2 substances react to form a single product?
a)
Decomposition
b)
Double Replacement
c)
Single Replacement
d)
Synthesis
18.
Which chemical reaction switches 2 elements?
a)
Double Replacement
b)
Single Replacement
c)
Combustion
d)
Decomposition
19.
Balance this equation
_Al +_HCl --> _H2 +_AlCl3
a)
2, 6, 3, 2
b)
it is already balanced
c)
4, 12, 3, 4
d)
2, 1, 4, 5
20.
What coefficient should go in the blank space to balance the chemical equation? 
2Al  +____  HCl   →    2AlCl3  +  3H2
a)
2
b)
4
c)
3
d)
6
21.
Which number should go in the blank?
_ H2 + O2 -> 2 H2O
a)
1
b)
2
c)
3
d)
0
22.
Which of the following shows the correct way to balance the chemical equation?
Fe + O2 -> Fe2O3
a)
4Fe + 3O2 -> 2Fe2O3
b)
2 Fe + 3O2 -> Fe2O6
c)
4 Fe + O6 -> 2Fe2O3
d)
None of the options are correctly balanced.
23.

Choose the balanced chemical equation with the correct states of matter:

Strontium metal reacts with Hydrobromic acid in solution to form strontium bromide crystals and hydrogen gas

a)

Sr (s) + HBr (l) ---> SrBr2 (s) + H (g)

b)

Sr (s) + HBr(aq) ---> SrBr2 (s) + H2 (g)

c)

Sr (m) + HBr (aq) ---> SrBr2 (s) + H2 (g)

d)

Sr (s) + HBr (l) ---> SrBr2 (aq) + H (g)

24.

Upon heating solid nitrogen dioxide, it produces two gaseous elements.

a)

2NO2 (g) ----> N2 (g) + 2O2 (g)

b)

NO2 (g) ----> N2 (g) + O2 (g)

c)

NO2 (g) ----> N (g) + 2O (g)

d)

NO2 (g) ----> N2 (aq) + O2 (aq)

25.

Choose the correct balanced chemical equation with the correct states of matter:

The hydrocarbon C4H10 burns. All products and reactants are gases.

a)

C4H8 (g) + 4O2 (g) -> 4CO2 + 4H2O

b)

C4H8 (g) + 6O2 (g) -> 4CO2 + 4H2O

c)

C4H8 (g) + O2 (g) ---> CO2 + H2O

d)

2C4H8 (g) + 14O2 (g) -> 8CO2 + 8H2O

26.

Choose the correct balanced equation with the correct states of matter:

Solid Iron (II) metal reacts with a solution of Lead (II) iodide to produce lead metal and a aqeous Iron (II) iodide

a)

Fe (m) + PbI (aq) ---> FeI (aq) + Pb (m)

b)

Fe (s) + PbI (aq) ---> FeI (aq) + Pb (s)

c)

Fe (m) + PbI2 (aq) --> FeI2 (aq) + Pb (m)

d)

Fe (s) + PbI2 (aq) ---> FeI2 (aq) + Pb (s)

27.

What type of reaction is represented by the equation: 2H2O2 --> 2H2O + O2?

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Combustion

28.

Balance the following chemical equation:
__C3H8 + __O2 --> __CO2 + __H2O

a)

C3H8 + 5O2 --> 3CO2 + 4H2O

b)

2C3H8 + 7O2 --> 6CO2 + 8H2O

c)

C3H8 + 3O2 --> 3CO2 + 8H2O

d)

C3H8 + 4O2 --> 3CO2 + 4H2O

29.

Which of the following is a correct representation of a double displacement reaction?

a)

2Na + Cl2 --> 2NaCl

b)

CaCO3 --> CaO + CO2

c)

Na2SO4 + BaCl2 --> BaSO4 + 2NaCl

d)

2H2 + O2 --> 2H2O

30.

Gaseous Nitric acid decomposes to produce hydrogen gas and gaseous nitrogen trioxide.

a)

2HNO2 (g) ---> H2 (g) + 2NO2 (g)

b)

2HNO3 (g) ---> H2 (g) + 2NO3 (g)

c)

2H3N (g) ---> 3H2 (g) + 2N (g)

d)

HNO3 (g) ---> H (g) + NO3 (g)

31.

Iron (II) metal reacts with chlorine gas to form solid iron (II) chloride

a)

Fe (II) (s) + Cl2 (g)---> Fe (II) Cl2 (s)

b)

Fe (s) + Cl2 (g) ---> FeCl2 (g)

c)

Fe (s) + Cl2 (g) ---> FeCl2 (s)

d)

Fe (s) + Cl (g) ---> FeCl (s)

32.

Which of the following observations provides evidence that a reaction has taken place

a)

Color change

b)

Gas is produced

c)

Bubbles are produces

d)

All of the above

33.

Which of the following provides evidence that a chemical reaction has taken place

a)

Fe is cut in half

b)

Gold does not replace zinc in a single replacement reaction

c)

Cu filings are placed in the bottom of a beaker with water

d)

A splint put into a test tube lights on fire after being put out

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