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Balancing Chemical Equations

Total questions: 50

Worksheet time: 13hrs 30mins

Name
Class
Date
1.
How many Oxygens are in this molecule? 
(OH)2
a)
4
b)
1
c)
2
d)
3
2.
What are the smaller numbers that you CANNOT change in a chemical equation? 
a)
Coefficient
b)
Products
c)
Reactants
d)
Subscript
3.
What are the larger numbers that you CAN CHANGE in a chemical equation? 
a)
Coefficient 
b)
Products
c)
Reactants
d)
Subscripts
4.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
5.
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 
6.

Balance this equation: _Zn + _O2 --> _ZnO

a)

1, 1, 2

b)

2, 1, 2

c)

1, 1, 1

d)

2 ,2, 2

7.
Is this balanced?
Al + O2 → 2Al2O3
a)
Yes
b)
No
8.

Which side of the yield sign are the reactants found?

a)

to the left

b)

to the right

c)

in the middle

9.

Which side of the arrow are the products found?

a)

to the left

b)

to the right

c)

in the middle

10.

How many water molecules do you need to balance the equation: __H20 --> 2H2 + O2?

a)

1

b)

2

c)

3

d)

0

11.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
12.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
13.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
8
14.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
15.
Is the following equation balanced?...
Al + O2 --> 2Al2O3
a)
Yes!
b)
No!
16.
Is the following equation balanced?
2C2H2 + 5O2 --> 4CO2 + 2H2O
a)
yes
b)
no
17.
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
18.
Is the following reaction balanced?
NaHCO3 --> Na2CO3 + H2O + CO2
a)
yes
b)
no
19.

Balance the following equation:

___ H2+ ___ O2→___ H2O

a)

1, 1, 3

b)

2, 2, 2

c)

1, 2, 1

d)

2,1, 2

20.

Balance the following equation:

___ Mg+ ___ O2→___ MgO

a)

1, 1, 3

b)

2, 1, 2

c)

1, 2, 1

d)

2, 2, 2

21.

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

22.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
23.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
24.
How many Mn atoms are found in the following compound?
3Cr(MnO4)6
a)
3
b)
4
c)
6
d)
18
25.
Name the part in red:

H2 + O2 -> H2O
a)
Coefficient
b)
Product
c)
Yield
d)
Subscript
26.

Determined whether the following equation is balanced or unbalanced. Ag + O2 ---> 2Ag2O

a)

Balanced

b)

Unbalanced

27.

Determine whether the following equations is balanced or unbalanced. H4 + O2 ---> 2H2O

a)

Balanced

b)

Unbalanced

28.

Determine whether the following equation is balanced or unbalanced. 4P +5O2 ---> 2P2O5

a)

Balanced

b)

Unbalanced

29.

Determine whether the following equation is balanced or unbalanced. H2 + Br2 ---> 2HBr

a)

Balanced

b)

Unbalanced

30.

Determine whether the following equation is balanced or unbalanced. 2Fe + 3Cl2 ---> FeCl3

a)

Balanced

b)

Unbalanced

31.

Determine whether the following equations is balanced or unbalanced. S8 + O2 ---> 8SO3

a)

Balanced

b)

Unbalanced

32.

In order for an equation to be balanced, there must be ...

a)

an equal amount of atoms on both sides

b)

a greater mass on the product side

c)

a greater mass on the reactant side

d)

elements with the same atomic # on both sides

33.

Which coefficients would balance this chemical equation? _Fe2O3 ---> _Fe + _O2

a)

2,1,2

b)

2,4,3

c)

1,1,1

d)

1,3,2

34.

Which coefficients would balance this chemical equation? _K + _Cl2 ---> _KCl

a)

1,1,1

b)

1,2,2

c)

1,1,2

d)

2,1,2

35.

Which of the following equations is balanced?

a)

P4 + 3O2 ---> 2P2O3

b)

N4 + 3F2 ---> 2NF3

c)

2LiF + Br2 ---> 2LiBr + F4

36.

 

How many Mn atoms are found in the following compound?

2MnO4

a)

2

b)

4

c)

6

d)

8

37.

Which of the following equations are correctly balanced?

a)

CO2 + H2O ---> 3C6H12O6 + O2

b)

12CO2 + H2O ---> C6H12O6 + O2

c)

6CO2 + 6H2O ---> C6H12O6 + 6O2

d)

CO2 + 9H2O ---> C6H12O6 + O2

38.

Balance this equation:

H2 + Cl2 ---> HCl

a)

H2 + Cl2 ---> 2HCl

b)

H2 + 3Cl2 ---> 6HCl

c)

3H2 + Cl2 ---> 6HCl

d)

It is balanced.

39.

Q. 

Complete the sentence.

During a chemical reaction, atoms ________.

a)

can disappear

b)

can appear

c)

stop moving and vibrating

d)

get rearranged

40.

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.

41.

Balance the following equation:

___ H2+ ___ O2→___ H2O

a)

1, 1, 3

b)

2, 2, 2

c)

1, 2, 1

d)

2, 1, 2

42.

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

43.

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

44.

 

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

45.

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

46.

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

47.

 

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

48.

 

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

49.

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

50.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4

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