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Worksheets

Balancing Equations

Total questions: 31

Worksheet time: 30mins

Name
Class
Date
1.
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.
2.
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
3.
How many Elements are in the compound C2H8O ?
a)
2
b)
1
c)
3
d)
0
4.
How many total atoms are in the compound C2H8O ?
a)
11
b)
2
c)
8
d)
1
5.
How many Magnesium are in 10MgCl2?
a)
10
b)
5
c)
20
6.
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
7.
Balance this equation.
_Mg + _Cl2 --> _MgCl2
a)
1, 2,1
b)
already balanced
c)
2,1,1
d)
1,1,2
8.
KNO3 --> KNO2 + O2
What coefficients are needed to balance the reaction?
a)
2, 2, 1
b)
2, 3, 2
c)
1, 2, 2
d)
1, 3, 1
9.
Balance this equation-
__P4 + __O2 --> __P2O3
a)
it is already balanced
b)
2, 1, 3
c)
1, 2, 3
d)
1, 3, 2
10.
Balance this equation.
_Mg + _Cl2 --> _MgCl2
a)
1, 2,1
b)
already balanced
c)
2,1,1
d)
1,1,2
11.
Balance this equation.
_CH4 + _O2 --> _CO2 + _H2O
a)
1,2,1,1
b)
2,1,2,1
c)
1,2,1,2
d)
0,2,0,2
12.

Fill in the blanks with coefficient:

PCl5+_ H2O→_ HCl+H3PO4

a)

4, 5

b)

1, 6

c)

3, 8

d)

2,2

13.

Which equation is balanced?

a)

PbO2 + 2H2--> H2SO4

b)

SO2 + H20 --> H2SO4

c)

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

d)

2Na + 2H2O --> 2NaOH + H

14.

What is the right ratio of chemicals for the balanced chemical equation?

__Na + __H2O --> __NaOH + __H2

a)

4,4 --> 4,1

b)

1,2 --> 2,4

c)

1,2 --> 2,1

d)

2,2 --> 2,1

15.

Balance the following equation:

___ H2+ ___ O2→___ H2O

a)

1, 1, 3

b)

2, 2, 2

c)

1, 2, 1

d)

2, 1, 2

16.

What are the numbers that you CANNOT change in a chemical equation? 

a)

Coefficient

b)

Products

c)

Reactants

d)

Subscripts

17.

What is a coefficient?

a)

The small number on the right of the chemical symbol.

b)

The large number in front of a chemical formula.

c)

The number in between the chemical symbols.

d)

The number behind a chemical formula.

18.

What is the right ratio of chemicals for the 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

19.

 

What is the right ratio of chemicals for the balanced chemical equation?

__CO + __Fe2O3--> __Fe + __CO2

a)

3,2 --> 1,1

b)

3,2 --> 2,4

c)

3,1 --> 2,3

d)

3,2 --> 2,1

20.

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

__CH4 + __O2 --> __CO2+ __H2O

a)

1,2 --> 2,1

b)

1,2 --> 1,1

c)

1,2 --> 1,2

d)

2,1 --> 2,1

21.

What is the right ratio of chemicals for the balanced chemical 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

22.

 

What is the right ratio of chemicals for the balanced chemical equation?

__H2SO3 + __KOH--> __H2O+ __K2SO3

a)

2,1 --> 2,1

b)

1,2 --> 1,1

c)

1,2 --> 1,2

d)

1,2 --> 2,1

23.

 

What is the right ratio of chemicals for the balanced chemical equation?

__FeCl3 + __Ca(OH)2 --> __Fe(OH)3 + __CaCl2

a)

4,3--> 2,1

b)

3,2 --> 3,1

c)

2,3 --> 2,2

d)

2,3 --> 2,3

24.

What is the right ratio of chemicals for the balanced chemical equation?

__MnO2 + __HCl --> __MnCl2 + __H2O __Cl2

a)

4,1 --> 2,1,2

b)

1,2 --> 1,1,4

c)

1,4 --> 1,2,1

d)

1,4 --> 2,2,1

25.

Balance the equation:

__ Na + __ CuSO4 → __ Na2SO4 + __ Cu

a)

2, 1, 1, 2

b)

2, 1, 1, 1

c)

2, 2, 2, 1

d)

2, 1, 2, 1

26.

Balance the equation:

__ Al + __ Ag2SO4 → __ Al2(SO4)3 + __ Ag

a)

2, 3, 1, 6

b)

2, 1, 1, 2

c)

2, 3, 2, 3

d)

2, 1, 2, 6

27.

Balance the equation:

__ C3H8 + __ O2 → __ CO2 + __ H2O

a)

2, 2, 3, 4

b)

1, 3, 3, 4

c)

1, 5, 2, 4

d)

1, 5, 3, 4

28.

Which of the following is the correct way to balance the equation below?

 _Fe2O3+_C —> _Fe+ _CO2

a)

2;4;3;3

b)

_;2;2;_

c)

2;3;4;3

d)

2;_;3;3

29.

Balance the following equation:

  CH4+Cl2→ CCl4+HClCH_4+Cl_2\rightarrow\ CCl_4+HCl  

Answer _:_:_:_

(a)  

30.

Balance the following equation:

  CO2+H2O → C6H12O6+O2CO_2+H_2O\ \rightarrow\ C_6H_{12}O_6+O_2    

Answer _:_:_:_

(a)  

31.

Balance the following equation:

   Al+HCl → AlCl3+H2Al+HCl\ \rightarrow\ AlCl_3+H_2    

Answer _:_:_:_

(a)  

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