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Classifying Chemical Equations

Total questions: 30

Worksheet time: 26mins

Name
Class
Date
1.

The reaction XY ⟶ X + Y is an example of _____.

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

2.

The reaction AB + X ⟶ XB + A is classified as a _____ reaction.

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

3.

The reaction AB + XY ⟶ XB + AY is an example of ______.

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

4.

The reaction A + B ⟶ AB is classified as a _____ reaction.

a)

synthesis

b)

decomposition

c)

single replacment

d)

double replacement

5.

What class of reaction best describes the equation below?

2HI ⟶ H2 + I2

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

6.

What class of reaction best describes the equation below?

Zn + H2S ⟶ ZnS + H2

a)

synthesis

b)

combustion

c)

single replacement

d)

double replacement

7.

What class of reaction best describes the equation below?

CH4 + O2 ⟶ CO2 + H2O

a)

single replacement

b)

double replacement

c)

decomposition

d)

combustion

8.

What class of reaction best describes the equation below?

FeS + HCl ⟶ H2S + FeCl2

a)

synthesis

b)

combustion

c)

single replacement

d)

double replacement

9.

Which of the following is an example of a synthesis reaction?

a)

Cl2 + 2NaBr ⟶ 2NaCl + Br2

b)

MgO + CO2 ⟶ MgCO3

c)

FeBr3 + K3PO4 ⟶ FePO4 + 3KBr

d)

2Na2O2 ⟶ 2Na2O + O2

10.

Which of the following is an example of a single replacement reaction?

a)

2NaF ⟶ 2 Na + F2

b)

P2O5 + 3 H2O ⟶ 2H3PO4

c)

2FeCl3 + 3Zn ⟶ 2Fe + 3ZnCl2

d)

C6H12O6 + 6O2 ⟶ 6CO2 + 6 H2O

11.

Which of the following is an example of a decomposition reaction?

a)

2NaF ⟶ 2 Na + F2

b)

P2O5 + 3 H2O ⟶ 2H3PO4

c)

2FeCl3 + 3Zn ⟶ 2Fe + 3ZnCl2

d)

C6H12O6 + 6O2 ⟶ 6CO2 + 6 H2O

12.

Which of the following chemical equations is an example of a double replacement reaction?

a)

2Al2O3 ⟶ 4Al + 3O2

b)

2C5H10 + 15O2 ⟶ 10CO2 + 10H2O

c)

2MgCl2 + Na2CO3 ⟶ 2 NaCl + MgCO3

d)

K2O + H2O ⟶ 2 KOH

13.

Which of the following chemical equations is an example of a combustion reaction?

a)

2Al2O3 ⟶ 4Al + 3O2

b)

2C5H10 + 15O2 ⟶ 10CO2 + 10H2O

c)

2MgCl2 + Na2CO3 ⟶ 2 NaCl + MgCO3

d)

K2O + H2O ⟶ 2 KOH

14.
Classify
Fe + O2 → Fe2O3
a)
synthesis
b)
decomposition
c)
double replacement 
d)
single replacement
15.
Mg + HCl --> MgCl2 + H2
a)
combustion
b)
synthesis
c)
decomposition
d)
single replacement
16.

Mg + N2 →Mg3N2

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Combustion

17.
2 C5H5 + Fe --> Fe(C5H5)2 
a)
single displacement
b)
double displacement
c)
decomposition
d)
synthesis
18.
KBr + MgO --> MgBr2 + K2O
a)
Combination/Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
19.
H2O ---> H2 + O2
a)
Combination/Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
20.

Which type of chemical reaction is this:

C2H4 + 3O2 -------- 2CO2 + 2H2O

a)

double replacement

b)

decomposition

c)

combustion

d)

synthesis

21.

Which type of chemical reaction is this:

3Fe + 4H2O -------- Fe3O4 + 4H2

a)

synthesis

b)

single replacement

c)

decomposition

d)

double replacement

22.
Which chemical reaction takes place when 2 substances react to form a single product?
a)
Decomposition
b)
Double Replacement
c)
Single Replacement
d)
Synthesis
23.

One reactant breaks down into several products.

a)

Decomposition

b)

Synthesis

c)

Combustion

d)

Single Replacement

24.
Always starts with a Hydrocarbon that reacts with oxygen and produces carbon dioxide and water. 
a)
Decomposition
b)
Synthesis
c)
Combustion
d)
Single Replacement
25.
Pb(NO3)2  +  KI --> PbI2 + KNO3
What type of reaction is this? 
a)
Synthesis 
b)
Decomposition 
c)
Single Replacement
d)
Double Replacement 
26.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
27.
What is a reactant?
a)
a volatile chemical
b)
a dangerous substance
c)
the substances you start with in a chemical reaction
d)
the substances that are formed by a chemical reaction 
28.
What is a product?
a)
a fancy word for make-up
b)
a volatile chemical
c)
the substances you start with in a chemical reaction
d)
the substances that are formed by a chemical reaction
29.
The number of atoms you begin with in a chemical reaction ...
a)
must be the same as the number of  atoms you end with
b)
must be an even number
c)
can be different to the number you finish with
d)
changes depending on how much energy is formed
30.
What mathematical function do coefficients perform in a balanced equation?
a)
addition
b)
subtraction
c)
multiplication
d)
division

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