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Balancing Equations/ Types of Reactions

Total questions: 75

Worksheet time: 2hrs 33mins

Name
Class
Date
1.

Which side of a chemical equation is the reactant side?

a)

Left (before the arrow)

b)

Right (after the arrow)

2.

Which side of a chemical equation is the product side?

a)

Left (before the arrow)

b)

Right (after the arrow sign)

3.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number to the left of a formula.
4.

A replacement reaction occurs when...

a)

Two formulas combine.

b)

A formula breaks apart.

c)

An atom is replaced during a reaction.

5.

A decomposition reaction occurs when...

a)

Two formulas combine.

b)

A formula breaks apart.

c)

An atom is replaced during a reaction.

6.

A synthesis reaction occurs when...

a)

Two formulas combine.

b)

A formula breaks apart.

c)

An atom is replaced during a reaction.

7.

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

a)

Yes

b)

No

8.
How would this equation be classified?
O2 + 2H2 --> 2H2O 
a)
Synthesis
b)
Decomposition
c)
Combustion
d)
Single Displacement
9.

Balance this equation:

2Li + Cl2 --> LiCl

a)

2Li + Cl2 --> 4LiCl2

b)

2Li + Cl2 -> LiCl2

c)

2Li + Cl2 -> 2LiCl

10.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
11.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
12.

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

13.

Balance this equation-

_____P4 + ______O2 --> _______P2O3

a)

it is already balanced

b)

2, 1, 3

c)

1, 2, 3

d)

1, 3, 2

14.

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

15.

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

16.

Balance this equation

______ N2 + _______H2 --> ______NH3

a)

1,2,3

b)

1,3,2

c)

1,1,2

d)

2,1,1

17.

Balance this equation.

______ Mg + _______ Cl2 --> _______ MgCl2

a)

1, 2,1

b)

already balanced

c)

2,1,1

d)

1,1,2

18.

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

19.
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. 
20.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
21.
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
22.

How many atoms of aluminum are on each side of the following equation:

4Al + 3O2 --> 2Al2 O3

(Remember: the atoms on the reactants side are the exact SAME as the ones on the products side. Don't count both sides!)

a)

2

b)

6

c)

1

d)

4

23.
Balance this equation,            
Al2O3 --> Al + O2 
a)
Cannot be balanced
b)
2Al2O3 --> 2Al+3O2 
c)
2Al2O3--> 4Al+3O2 
d)
3Al2O3--> 2Al+O2 
24.

N2 + H2 --> NH4

a)

Balanced

b)

Unbalanced

25.
3Mg + N2 --> Mg3N2
a)
Synthesis 
b)
Decomposition
c)
Single displacement
d)
Combustion
26.
2NO2 --> N2 + 2O2
a)
Synthesis
b)
Decomposition
c)
Single displacement
d)
Combustion
27.
P4 + 3O2 --> 2P2O3
a)
Synthesis 
b)
Decomposition
c)
Single displacement
d)
Combustion
28.
Which chemical reaction breaks down into 2 substances?
a)
Double Replacement
b)
Single Replacement
c)
Synthesis
d)
Decomposition
29.
Which chemical reaction switches 2 elements?
a)
Double Replacement
b)
Single Replacement
c)
Combustion
d)
Decomposition
30.
A + B = AB
a)
Double Replacement
b)
Synthesis
c)
Combustion
d)
Decomposition
31.
AB + CD = AD + CB
a)
Double Replacement
b)
Single Replacement
c)
Combustion
d)
Decomposition
32.
A + BC = B + AC
a)
Single Replacement
b)
Combustion
c)
Double Replacement
d)
Synthesis
33.
Which chemical reaction takes place when 2 substances react to form a single product?
a)
Decomposition
b)
Double Replacement
c)
Single Replacement
d)
Synthesis
34.
AB = A + B
a)
Decomposition
b)
Single Replacement
c)
Combustion
d)
Synthesis
35.
Si + S8 →Si2S4
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Double replacement
36.
Ca + AlCl3→ CaCl2 + Al
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Double replacement
37.
KOH + H3PO4 → K3PO4 + H2O
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Double replacement
38.
Pb(NO3)2 →PbO + NO2 + O2
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Combustion
39.
NO2 →N2 + O2
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Combustion
40.

What kind of reaction is this?


Na2S + 2HCl → 2NaCl + H2S

a)

Synthesis

b)

Decomposition

c)

Single-Replacement

d)

Double-Replacement

41.
The blue numbers in the image below represent ________
a)
Charges
b)
coefficients
c)
subscripts
d)
none of the answers are correct
42.

Which of the following models best demonstrates a balanced chemical equation?

a)

F

b)

G

c)

H

d)

J

43.

C3H8 + 5O2 → 3CO2 + 4H2O + heat


What kind of reaction is this?

a)

Synthesis

b)

Decomposition

c)

Combustion

d)

Double-replacement

44.

The following is the chemical reaction that happens when you mix stomach acid with an antacid tablet.


HCl + NaHCO3 → NaCl + HCO3


What kind of reaction is this?

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

45.

Potassium nitrate forms potassium oxide, nitrogen, and oxygen in certain fireworks.


4KNO3 → 2K2O + 2N2 + 5O2


What kind of reaction is this?

a)

Synthesis

b)

Decomposition

c)

Single-Replacement

d)

Double-Replacement

46.

What type of reaction is the reverse of a synthesis reaction?

a)

Single-replacement

b)

Combustion

c)

Decomposition

d)

Double-replacement

47.

How many oxygen (O) atoms are present in the following equation?


(Remember: the atoms on the reactants side are the exact SAME atoms on the products side. Don't count both sides!)


HCl + NaHCO3 → NaCl + HCO3

a)

3

b)

6

c)

9

d)

12

48.
Which problem is balanced?
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
49.
A replacement occurs when...
a)
Two formulas combine.
b)
A formula breaks apart.
c)
An atom is replaced during a reaction.
50.
Decomposition occurs when...
a)
Two formulas combine.
b)
A formula breaks apart.
c)
An atom is replaced during a reaction.
51.
A synthesis occurs when...
a)
Two formulas combine.
b)
A formula breaks apart.
c)
An atom is replaced during a reaction.
52.
Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe
a)
Yes
b)
No
53.

Balance this equation:

MgCl2 --> Mg4 + Cl2

a)

It's already balanced.

b)

4MgCl2 --> Mg4+ 4Cl2

c)

4MgCl2 --> Mg4+ 5Cl2

54.

Balance this equation-

_____ SeCl6 + _____O2 --> ____SeO2 + ______Cl2

a)

1,2,1,2

b)

1,1,1,3

c)

1,2,1,1

d)

2,1,1,1

55.

Balance this equation.

___ N2 + ____O2 ---> _____H2O + _____HNO3

a)

not possible

b)

2,2,1,2

c)

2,1,1,4

d)

2,2,1,4

56.
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
57.

How many atoms of aluminum are on each side of the following equation:

4Al + 3O2 --> 2Al2 O3

a)

2

b)

6

c)

1

d)

4

58.
How many F atoms are in this compound?
6MgF2 
a)
2
b)
6
c)
8
d)
12
59.
How many Al atoms are in this compound?         4Al2O3
a)
2
b)
8
c)
6
d)
4
60.
What type a reaction is taking place in this picture?
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
61.
3KOH + H3PO4 --> K3PO4 + 3H2O
a)
Synthesis 
b)
Decomposition
c)
Single displacement
d)
Double displacement
62.
C4H12 + O2 → CO2 + H2O
a)
Synthesis
b)
Combustion
c)
Single Replacement
d)
Double Replacement
63.
4Si   + S8   -->   2Si2S4
a)
Synthesis
b)
Decomposition
c)
Single Displacement
d)
Double Displacement
64.
2Pb(NO3)2   -->   2PbO +  4NO2  +  O2
a)
Synthesis
b)
Decomposition
c)
Single Displacement
d)
Combustion
65.
The following is what type of reaction:
NH3 + HCl  → NH4Cl
a)
Synthesis
b)
Decomposition
c)
Single Replacement Replacement
d)
Double Replacement Replacement
66.
What type of chemical reaction is this?
Al(OH)3 → Al2O3  + H2O
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement 
67.
Which type of reaction can be recognized by the general pattern?
A + BC--> AC + B
a)
Decomposition
b)
Combustion
c)
Single Replacement
d)
Double Replacement
68.

Balance the following equation:


_____ C2H6 + _______ O2 --> ________ H2O + _______ CO2

a)

2, 1, 1, 3

b)

2, 7, 6, 4

c)

2, 3, 1, 6

d)

2, 1, 4, 6

69.

Balance the following equation:


____ SnO2 + ______ H2 ---> _____ Sn + ______ H2O

a)

1, 2, 1, 2

b)

2, 2, 1, 2

c)

2, 1, 2, 1

d)

1, 1, 1, 2

70.

Balance the following equation:


_____ Na3PO4 + ______ HCl --> ______ NaCl + _______ H3PO4

a)

1, 1, 3, 3

b)

3, 1, 1, 3

c)

3, 1, 3, 1

d)

1, 3, 3, 1

71.

_____ TiCl4 + ______ H2O --> ______ TiO2 + _____ HCl

a)

4, 1, 1, 4

b)

1, 2, 1, 4

c)

2, 2, 1, 2

d)

4, 2, 2, 4

72.

_____NaBr + _____Cl2 ---> ______NaCl + _______Br2

a)

1, 2, 1, 2

b)

4, 2, 1, 2

c)

2, 1, 2, 1

d)

3, 1, 1, 3

73.

Balance the following equation:


____ FeS + _____ O2 ---> ____ Fe2O3 + _____ SO2

a)

1, 4, 1, 5

b)

2, 7, 1, 2

c)

2, 5, 2, 2

d)

4, 7, 2, 4

74.

Balance the following equation:


______ C2H6O + _____ O2 ---> ______ CO2 + _______ H2O

a)

1, 2, 2, 1

b)

1, 3, 2, 3

c)

3, 1, 1, 3

d)

1, 3, 1, 3

75.

____ NH4NO3 ---> ______ N2 + _____ O2 + _______ H2O

a)

4, 2, 1, 4

b)

2, 2, 1, 2

c)

1, 2, 1, 4

d)

2, 2, 1, 4

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