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Worksheets

Balancing Chemical Equations

Total questions: 120

Worksheet time: 4hrs 37mins

Name
Class
Date
1.
What coefficient should be used to make the following equation balanced?
N2+O2--> _NO 
a)
1
b)
2
c)
3
d)
4
2.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
8
3.
The numbers needed to balance the equation are:
a)
2, 7, 6, 4
b)
2, 1, 3, 2
c)
1, 1, 3, 2
d)
2, 3, 1, 3
4.
The numbers needed to balance the equation are:
a)
2, 7, 6, 4
b)
2, 1, 3, 2
c)
3, 1, 1, 3
d)
2, 3, 1, 3
5.
The numbers needed to balance the equation are:
a)
1, 1, 1, 2
b)
1, 1, 2, 2
c)
1, 1, 1, 1
d)
2, 3, 1, 3
6.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__CO + __Fe2O3--> __Fe + __CO2
a)
3,1 --> 2,3
b)
3,2 --> 1,1
c)
3,2 --> 2,4
d)
3,2 --> 2,1
7.
Which number should go in the blank?
Mn + _ HNO3 → Mn(NO3)2 + H2
a)
1
b)
2
c)
3
d)
0
8.
Which number should go in the blank?
Al(NO3)3 + _  NaOH -> Al(OH)3 + 3 NaNO3
a)
1
b)
2
c)
3
d)
0
9.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
10.

Balance this equation

_Al +_HCl --> _H2 +_AlCl3

a)

2,6,3,2

b)

it's already balanced

c)

4,12,3,4

d)

2,1,4,5

11.

Determine the coefficients to make the following equation balanced?

__N2 + __O2--> __NO

a)

1, 1, 1

b)

1, 1, 2

c)

2, 2, 2

d)

1, 2, 2

12.

Determine the coefficients to balance the equation.

__Al +__HCl --> __H2 +__AlCl3

a)

2,6,3,2

b)

it's already balanced

c)

4,12,3,4

d)

2,1,4,5

13.

Balance the the following equation.

__Zn+__HCl -->__ZnCl2 +__H2

a)

1,1,2,1

b)

1,1,1,2

c)

1,2,1,1

d)

2,1,1,1

14.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
8
15.

Which equation is balanced?

a)

PbO2 + 2H2

b)

SO2 + H20 --> H2SO4

c)

2Na + 2H2O --> 2NaOH + H2

16.

What law governs the balancing of chemical equations?

a)

Law of Energy

b)

Law of Conservation of Matter/Mass

c)

Law of Gravity

d)

Law of Matter Movement

17.

What are the coefficients that would properly balance this equation?

__Ca + __H2O --> __Ca(OH)2 + __H2

a)

2,1 --> 2,1

b)

1,2 --> 1,1

c)

1,2 --> 2,4

d)

1,2 --> 2,1

18.

What are the coefficients that would properly balance this equation?

__AgNO3 + __H2S --> __Ag2S+ __HNO3

a)

2,1 --> 1,2

b)

1,2 --> 1,1

c)

1,2 --> 1,2

d)

1,2 --> 2,1

19.

What are the coefficients that would properly balance this equation?

__H2 + __S --> __H2S

a)

1,1 --> 1

b)

2,2 --> 2

c)

1,2 --> 1

d)

1,2 --> 2

20.

What are the coefficients that would properly balance this equation?

__Al + __O2--> __Al2O3

a)

4,1 --> 2

b)

4,3 --> 4

c)

3,4 --> 1

d)

4,3 --> 2

21.
CaCO3 represents a chemical
a)
Symbol
b)
Formula
c)
Subscript
d)
Reaction
22.
The substances listed on the left side of a chemical equation are the
a)
Products
b)
Coefficients
c)
Precipitates
d)
Reactants
23.
In chemical reactions, what does the principle of conservation of mass mean?
a)
Matter is not created or destroyed.
b)
The total mass of the reactants is greater than the total mass of the products.
c)
The total mass of the reactants is less than the total mass of the products.
d)
Matter is not changed.
24.
The substances listed on the right side of a chemical equation are the
a)
Yields
b)
Reactants
c)
Products
d)
Precipitates
25.
How many phosphorus atoms are in PO4?
a)
1
b)
2
c)
3
d)
4
26.
How many hydrogen atoms are in 2 H2?
a)
1
b)
2
c)
3
d)
4
27.
In balancing chemical equations, we change
a)
Coefficients
b)
Subscripts
c)
Both can be changed
d)
None can be changed
28.
Which number should go in the blank?
_ H2 + O2 -> 2 H2O
a)
1
b)
2
c)
3
d)
0
29.
Which number should go in the blank?
2 Na+ _ Cl2 -> 2 NaCl
a)
1
b)
2
c)
3
d)
0
30.
Which number should go in the blank?
Mn + _ HNO3 → Mn(NO3)2 + H2
a)
1
b)
2
c)
3
d)
0
31.
Which number should go in the blank?
Al(NO3)3 + _  NaOH -> Al(OH)3 + 3 NaNO3
a)
1
b)
2
c)
3
d)
0
32.
How many oxygen atoms are present in the following? 
4Ca(OH)2
a)
4
b)
6
c)
8
d)
1
33.
This is used to represent the amount of each atom in a molecule. What is the arrow pointing to?
a)
Exponent
b)
Coefficient
c)
Molecule
d)
Subscript
34.
How many Iron (Fe) atoms are in this chemical formula?
a)
2 iron atoms
b)
6 iron atoms
c)
5 iron atoms
d)
4 iron atoms
35.
Which number should go in the blank?
Al(NO3)3 + _  NaOH -> Al(OH)3 + 3 NaNO3
a)
1
b)
2
c)
3
d)
0
36.

What physical state symbol should be included for water?

a)

(s) - solid

b)

(l) - liquid

c)

(g) - gas

d)

(aq) - aqueous

37.

What physical state symbol should be included for carbon dioxide?

a)

(s) - solid

b)

(l) - liquid

c)

(g) - gas

d)

(aq) - aqueous

38.

What physical state symbol should be included for glucose?

a)

(s) - solid

b)

(l) - liquid

c)

(g) - gas

d)

(aq) - aqueous

39.

What physical state symbol should be included for oxygen?

a)

(s) - solid

b)

(l) - liquid

c)

(g) - gas

d)

(aq) - aqueous

40.

Why does oxygen's symbol have a subscript "2"?

a)

Because it is monoatomic.

b)

Because it is diatomic.

c)

Because it is triatomic.

41.

Write a balanced chemical equation for the following reaction.


Iron metal reacts with water to form Fe3O4 and hydrogen gas.

4 lines
42.
Balance this equation
_N2 + _H2 --> _NH3
a)
1,2,3
b)
1,3,2
c)
1,1,2
d)
2,1,1
43.
Balance this equation
_Zn+_HCl-->_ZnCl2 +_H2
a)
1,1,2,1
b)
1,1,1,2
c)
1,2,1,1
d)
2,1,1,1
44.
Which of the following is an unbalanced equation?
a)
CaCO3 --> CaO + CO2
b)
PbO2 + 2H2-->2Pb + H2O
c)
2Na+ 2H2O-->2NaOH + H2
d)
CS2 + 2O2 --> CO2 + 2SO2
45.
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.
46.
What coefficient should be used to make the following equation balanced?
N2+O2--> _NO 
a)
1
b)
2
c)
3
d)
4
47.
Which problem is balanced?
(Check ALL answers)
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
48.
Balance this equation:
P4+O2  -->  P2O3
a)
3 P4+ O2 --> 2 P2O3
b)
 P4+ O2 --> 2 P2O3
c)
 P4+ 3 O2 --> 2 P2O3
d)
 P4+ 2 O2 --> 3 P2O3
49.
Balance this equation...
H2 + Cl2 --> HCl
a)
It is balanced 
b)
3H2 + Cl2 --> 6H2Cl
c)
H2 + Cl2 --> 2HCl
d)
I don't know! Oh well.
50.
Balance this equation...
HgO --> 2Hg + O2
a)
It is balanced 
b)
2HgO --> Hg + O2
c)
2HgO --> 2Hg + O2
d)
I don't know...Oh well!
51.
A sealed test tube containing 8 grams of iron filings and 5 grams of sulfur is heated until the material in the test tube glows bright red.  What is the mass of products? 
a)
Mass is less than 13 grams
b)
Mass is equal to 13 grams
c)
Mass is greater than 13 grams
d)
Mass cannot be measured
52.
Which of the following equations are correctly balanced?
a)
12CO2 +H2O --> C6H12O6 + O2
b)
CO2 + 9H2O --> C6H12O6 + O2
c)
CO2 + H2O --> 3C6H12O6 + O2
d)
6CO2 + 6H2O --> C6H12O6 + 6O2
53.

What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?

__Ca + __H2O --> __Ca(OH)2 + __H2

a)
2,1 --> 2,1
b)
1,2 --> 1,1
c)
1,2 --> 2,4
d)
1,2 --> 2,1
54.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__CO + __Fe2O3--> __Fe + __CO2
a)
3,1 --> 2,3
b)
3,2 --> 1,1
c)
3,2 --> 2,4
d)
3,2 --> 2,1
55.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
56.

Balance this equation

_Al +_HCl --> _H2 +_AlCl3

a)

2,6,3,2

b)

it's already balanced

c)

4,12,3,4

d)

2,1,4,5

57.

Balance the following equation:

___ H2+ ___ O2→___ H2O

a)

1, 1, 3

b)

2, 2, 2

c)

1, 2, 1

d)

2,1, 2

58.

Balance the following equation:

___ Mg+ ___ O2→___ MgO

a)

1, 1, 3

b)

2, 1, 2

c)

1, 2, 1

d)

2, 2, 2

59.

Balance the following equation:

___ SeCl6+ ___ O2→___ SeO2+____Cl2

a)

1, 1, 1, 3

b)

2, 1, 2, 1

c)

1, 2, 1, 2

d)

2, 2, 2, 4

60.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
61.

Which type of reaction is described in the following equation:

C3H8 + 5O2 → 3CO2 + 4H2O

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

62.

3Mg + N2 --> Mg3N2

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

63.

NO2 --> N2 + O2

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

double replacement

64.

Ca + AlCl3 --> CaCl2 + Al

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

65.
Balance this equation,            
Al2O3 --> Al + O2 
a)
Cannot be balanced
b)
2Al2O3 --> 2Al+3O2 
c)
2Al2O3--> 4Al+3O2 
d)
3Al2O3--> 2Al+O2 
66.
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
67.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
6
c)
8
d)
24
68.
Balance this equation.
_Mg + _Cl2 --> _MgCl2
a)
1, 2,1
b)
already balanced
c)
2,1,1
d)
1,1,2
69.
Which problem is balanced?
a)
PbO2 + 2H2--> H2SO4
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
d)
2Na + 2H2O --> 2NaOH + H
70.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__CO + __Fe2O3--> __Fe + __CO2
a)
3,1 --> 2,3
b)
3,2 --> 1,1
c)
3,2 --> 2,4
d)
3,2 --> 2,1
71.

What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?

__Ca + __H2O --> __Ca(OH)2 + __H2

a)
2,1 --> 2,1
b)
1,2 --> 1,1
c)
1,2 --> 2,4
d)
1,2 --> 2,1
72.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__Na + __H2O --> __NaOH + __H2
a)
2,2 --> 2,1
b)
4,4 --> 4,1
c)
1,2 --> 2,4
d)
1,2 --> 2,1
73.

What are the coefficients that would properly balance this equation?

__H2 + __S --> __H2S

a)

1,1 --> 1

b)

2,2 --> 2

c)

1,2 --> 1

74.

What are the coefficients that would properly balance this equation?

__N2 + __O2 --> __NO

a)

1, 1 --> 1

b)

1, 1 --> 2

c)

2, 2 --> 2

75.

What are the coefficients that would properly balance this equation?

__Zn+__HCl -->__ZnCl2 +__H2

a)

1,1 --> 2,1

b)

1,1 --> 1, 2

c)

1,2 --> 1,1

76.

What are the coefficients that would properly balance this equation?

_Al +_HCl --> _H2 +_AlCl3

a)

2,6 --> 3,2

b)

2,1 --> 4,5

c)

4,12 -->3,4

77.

What are the coefficients that would properly balance this equation?

___ H2+ ___ O2→___ H2O

a)

1, 1 --> 3

b)

2, 2 --> 2

c)

2,1 --> 2

78.

What are the coefficients that would properly balance this equation?

___ SeCl6+ ___ O2→___ SeO2+____Cl2

a)

1, 1 --> 1, 3

b)

2, 1 --> 2, 1

c)

2, 2 --> 2, 4

79.

What are the coefficients that would properly balance this equation?

_N2 + _H2 --> _NH3

a)

1, 2 --> 3

b)

1, 3 --> 2

c)

1,1 --> 2

80.

Balance this equation:

__H2 + __Cl2 ---> __HCl

a)

H2 + 3Cl2 ---> 6HCl

b)

H2 + Cl2 ---> 2HCl

c)

3H2 + Cl2 ---> 6HCl

81.

Balance this equation:

HgO ---> 2Hg + O2

a)

HgO ---> Hg + 2O2

b)

2HgO ---> 2Hg + O2

c)

2HgO ---> Hg + O2

82.

Balance this equation:

Sb2S3 + O2 ---> Sb + SO2

a)

3Sb2S3 + 3O2 ---> 2Sb + SO2

b)

Sb2S3 + O2 ---> 2Sb + SO2

c)

Sb2S3 + 3O2 ---> 2Sb + 3SO2

83.

Balance this equation:

2Li + Cl2 --> LiCl

a)

2Li + Cl2 --> 4LiCl2

b)

2Li + Cl2 --> LiCl2

c)

2Li + Cl2 --> 2LiCl

84.

Balance this equation:

MgCl2 --> Mg4+ Cl2

a)

MgCl2 --> Mg4+ Cl2

b)

4MgCl2 --> Mg4+ 4Cl2

c)

4MgCl2 --> Mg4+ 5Cl2

85.

Balance this equation...

Fe + HCl --> FeCl2 + H2

a)

Fe + HCl --> FeCl2 + H2

b)

Fe + 2HCl --> FeCl2 + H2

c)

Fe + 6HCl --> 3FeCl2 + 3H2

86.

Balance this equation:

P4+O2 --> P2O3

a)

3 P4+ O2 --> 2 P2O3

b)

P4+ O2 --> 2 P2O3

c)

P4+ 3 O2 --> 2 P2O3

87.

Balance this equation

_Al +_HCl --> _H2 +_AlCl3

a)

2,6,3,2

b)

it's already balanced

c)

4,12,3,4

d)

2,1,4,5

88.

The coefficient in 3H2O is

a)

6

b)

5

c)

2

d)

3

89.

Balance the following equation:

___ SeCl6+ ___ O2→___ SeO2+____Cl2

a)

1, 1, 1, 3

b)

2, 1, 2, 1

c)

1, 2, 1, 2

d)

2, 2, 2, 4

90.

What is the part of the chemical equation in green called?

Fe + S → FeS

a)

products

b)

reactants

c)

yield

d)

chemical formula

91.

What are the coefficients that would properly balance this equation?

__Al +__HCl → __H2 +__AlCl3

a)

1, 1, 1, 1

b)

2, 6, 3, 2

c)

4, 12, 3, 4

d)

2, 1, 4, 5

92.

What are the coefficients that would properly balance this equation?

__HgO → __Hg + __O2

a)

1, 1, 1

b)

2, 2, 1

c)

2, 1, 1

d)

1, 1, 2

93.

What are the coefficients that would properly balance this equation?

__H2 + __Cl2 → __HCl

a)

1, 1, 1

b)

1, 1, 2

c)

3, 1, 6

d)

1, 3, 6

94.

Balance this equation:

__Sb2S3 + __O2 → __Sb + __SO2

a)

1, 1, 1, 1

b)

1, 1, 2, 1

c)

1, 3, 2, 3

d)

3, 3, 2, 1

95.

Balance this equation:

__P4 + __O2 → __P2O3

a)

1, 1, 1

b)

2, 1, 3

c)

1, 2, 3

d)

1, 3, 2

96.
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
97.

When balanced, the correct coefficients for the equation are:

a)

1, 3, 3, 1

b)

1, 3, 2, 1

c)

2, 3, 3, 1

d)

1, 1, 3, 1

98.
Balance this equation.
_CF4 + _Br2 -- _CBr4 + _F2
a)
2,1,2,1
b)
1,2,2,1
c)
1,2,1,2
d)
2,2,2,2
99.
Balance this equation
_Zn+_HCl-->_ZnCl2 +_H2
a)
1,1,2,1
b)
1,1,1,2
c)
1,2,1,1
d)
2,1,1,1
100.

Balance: _Ag2O --> _Ag + _O2

(Example answer: 1,2,1)

(a)  

101.

Balance: _C4H8 + _O2 --> _CO2 + _H2O

(Example answer: 1,2,1)

(a)  

102.

Balance: _Na + _O2 --> _Na2O2

(Example answer: 1,2,1)

(a)  

103.

Balance: _Hg + _O2 --> _HgO

(Example answer: 1,2,1)

(a)  

104.

Balance: _ZnS + _O2 --> _ZnO + _SO2

(Example answer: 1,2,1)

(a)  

105.

Balance: _H2S + _O2 --> _H2O + _SO2

(Example answer: 1,2,1)

(a)  

106.

Balance: _C2H2 +_O2 --> _H2O + _CO2

(Example answer: 1,2,1)

(a)  

107.

Balance: _Fe + _H2O --> _H2 +_Fe2O3

(Example answer: 1,2,1)

(a)  

108.

Balance: _Al + _HCl --> _ AlCl3 + _H2

(Example answer: 1,2,1)

(a)  

109.

Balance: _Na + _H2O --> _H2 +_NaOH

(Example answer: 1,2,1)

(a)  

110.

Balance: _Al + _Cl2 --> _AlCl3

(Example answer: 1,2,1)

(a)  

111.

Balance: _H2O + _O2 --> _H2O2

(Example answer: 1,2,1)

(a)  

112.

Balance: _H2 + _N2 --> _NH3

(Example answer: 1,2,1)

(a)  

113.

Balance _H2 + _O2 --> _H2O

(Example answer: 1,2,1)

(a)  

114.

Write the coefficients for the reactants and products for the reaction in the picture.

4 lines
115.

Write the coefficients for the reactants and products for the reaction in the picture.

4 lines
116.

Write the coefficients for the reactants and products for the reaction in the picture.

4 lines
117.

Write the coefficients for the reactants and products for the reaction in the picture.

4 lines
118.

Write the coefficients for the reactants and products for the reaction in the picture.

4 lines
119.

Balance this reaction:


___RbNO3 + ___BeF2 --> ___Be(NO3)2 + ___RbF

a)

2, 1 --> 1, 2

b)

1, 2 --> 2, 1

c)

1, 2 --> 1, 1

d)

2, 1 --> 2, 1

120.

Balance this reaction:


___GaF3 + ___Cs --> ___CsF + ___Ga

a)

3, 1 --> 1, 1

b)

1, 1 --> 3, 1

c)

3, 1 --> 1, 3

d)

1, 3 --> 3, 1

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