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Balancing Chemical Equations

Total questions: 40

Worksheet time: 46mins

Name
Class
Date
1.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
2.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
3.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
4.
The red numbers in the image below represent ________
a)
subscripts
b)
coefficients
c)
I don't know, and don't want to try
d)
None of the answers are correct
5.
The blue numbers in the image below represent ________
a)
I don't know, and don't want to try
b)
coefficients
c)
subscripts
d)
none of the answers are correct
6.
The substances at the beginning of a chemical equation are called the ____
a)
product
b)
yield
c)
chemical symbol
d)
reactants
7.
In the equation,          2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
8.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
9.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
2
c)
8
d)
24
10.
What does the Law of Conservation of Mass state?
a)
Matter cannot be gained or lost in a chemical reaction.
b)
Matter can only be lost in a chemical reaction.
c)
Matter can only be gained in a chemical reaction.
d)
Matter can be gained and lost in a chemical reaction. 
11.

What is the right part of a chemical equation called...

H2 + O2 --> H2O

a)

Reactants

b)

Products

c)

Yields

d)

Chemical Equation

12.

What is the arrow in a chemical equation...

H2 + O2 --> H2O

a)

Reactants

b)

Products

c)

Yields

d)

Chemical Equation

13.
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.
14.
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!
15.
Balance this equation...
Sb2S3 + O2 --> Sb + SO2
a)
It is balanced
b)
Sb2S3 + 3O2 --> 2Sb + 3SO2
c)
Sb2S3 + O2 --> 2Sb + SO2
d)
I don't know...Oh well!
16.
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
17.
When balancing equations a ____ can be placed to the left of a formula of a substance to make the equations balanced
a)
charge
b)
subscript
c)
random number
d)
coefficient
18.
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.
19.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
20.

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

21.
2HI --> H2 + I2
a)
synthesis
b)
decomposition
c)
single replacement
d)
double replacement
22.
Zn + H2S --> ZnS + H2
a)
synthesis
b)
combustion
c)
single replacement
d)
double replacement
23.
CH4 + O2 --> CO2 + H2O 
a)
single replacement
b)
double replacement
c)
acid base
d)
combustion
24.
FeS + HCl --> H2S + FeCl2
a)
synthesis
b)
combustion
c)
single replacement
d)
double replacement
25.
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
26.
Balance this equation
_N2 + _H2 --> _NH3
a)
1,2,3
b)
1,3,2
c)
1,1,2
d)
2,1,1
27.
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
28.
How many atoms of Hydrogen are in this compound
a)
1
b)
2
c)
3
d)
4
29.
How many atoms of Oxygen are in this compound?
a)
1
b)
2
c)
3
d)
4
30.

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

31.

Balance the equation.

__Mg + __Cl2 --> __MgCl2

a)

1, 2,1

b)

already balanced

c)

2,1,1

d)

1,1,2

32.

Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe

a)

yes

b)

no

33.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
34.
Balance this equation:
 2Li + Cl2 -> LiCl
a)
2Li + Cl2 -> 4LiCl2
b)
2Li + Cl2 -> LiCl2
c)
2Li + Cl2 -> 2LiCl
35.

Which of the coefficients could be used to balance this equation?

__Ag2O →__ Ag +___O2

a)

2,4,1

b)

1,1,1

c)

2,1,2

d)

2,2,2

36.
Is the following equation balanced or unbalanced ? 
Al + O2 --> Al2O3
a)
Balanced
b)
Unbalanced
37.

__ P4 + __ O2 -----> ____P2O5

a)

1, 5, 2

b)

2, 5, 7

c)

2, 1, 5

d)

5, 1, 2

38.

___ Cr + ___O2 -----> ____ Cr2O3

a)

3, 2, 4

b)

2, 3, 4

c)

2,1, 5

d)

4, 3, 2

39.

___ NaClO3 ----> ___ NaCl + ___ O2

a)

1, 3, 2

b)

2,3,2

c)

2, 2,3

d)

3, 2, 2

40.

___ H2 +___O2 ----> ____ H2O

a)

1, 2, 2

b)

2, 2, 1

c)

1, 2, 3

d)

2, 1, 2

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