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WorksheetsBalancing Synthesis and Decomposition Equations
Total questions: 23
Worksheet time: 58mins
Name
Class
Date
1.
A decomposition reaction can be represented as _____________________.
a)
AB → A + B
b)
A + B → AB
c)
AB + CD → AC + BD
d)
A + BC → B + AC
2.
A chemical change in which a single compound breaks down into two or more simpler products is called a ______________________.
a)
single-replacement reaction
b)
synthesis reaction
c)
double-replacement reaction
d)
decomposition reaction
3.
This chemical equation for mercury oxide is an example of what type of reaction?
2HgO → 2Hg + O2
2HgO → 2Hg + O2
a)
decomposition reaction
b)
synthesis reaction
c)
combustion reaction
d)
Marvin the Martian reaction
4.
Choose the balanced chemical equation for the formation of iron oxide.
a)
2Fe + O2 → 2FeO2
b)
Fe + O2 → FeO2
c)
4Fe + 3O2 → 2Fe2O3
d)
4Fe + O2 → 2FeO2
5.
A chemical change in which two or more substances react to form a new substance is a ____________________________.
a)
decomposition reaction
b)
synthesis reaction
c)
double displacement reaction
d)
combustion reaction
6.
A synthesis reaction can be represented as ________________________.
a)
AB + CD → AC + BD
b)
AB → A + B
c)
A + B → AB
d)
A + BC → B + AC
7.
This chemical equation for magnesium oxide is an example of what type of reaction?
2Mg + O2 → 2MgO
2Mg + O2 → 2MgO
a)
decomposition reaction
b)
synthesis reaction
c)
single displacement reaction
d)
combustion reaction
8.
Which of the following is an example of synthesis?
a)
Na + Br2 --> NaBr
b)
KClO3 --> KCl + O2
c)
HgO + Cl2-->HgCl + O2
d)
Cl2 + NaBr --> NaCl + Br2
9.
What is decomposition?
a)
putting substances together
b)
breaking substances apart
c)
element replacing another element in a compoud
d)
burning of a subtance
10.
What type of chemical reaction is this?
Al(OH)3 → Al2O3 + H2O
Al(OH)3 → Al2O3 + H2O
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement
11.
Which coefficients are required to correctly balance the equation:
C2S2 + O2 → CO2 + S2O
C2S2 + O2 → CO2 + S2O
a)
1, 2, 3, 2
b)
2, 5, 4, 2
c)
2, 4, 5, 2
d)
2, 3, 5, 2
12.
Balancing the following:
____ Al + ____ HCl → ____ AlCl3 + ____ H2
a)
1,3,1,2
b)
2,3,2,3
c)
2,6,2,3
d)
3,2,6,2
13.
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
14.
Balance the following:
____ H2SO4 + ____ NaNO2 → ____ HNO2 + ____ Na2SO4
a)
1,1,2,1
b)
1,2,2,1
c)
2,3,3,2
d)
4,3,2,1
15.
Balance the following: Fluorine and Aluminum oxide react to produce Aluminum fluoride and Oxygen
a)
6,2,4,3
b)
3,4,2,6
c)
5,1,3,2
d)
3,2,4,3
16.
Which type of reaction is:
2 H3AsO4 → As2O5 + 3 H2O
a)
Synthesis
b)
Decomposition
c)
Single Displacement
d)
Combustion
17.
Which of the following is an example of synthesis?
a)
Na + Br2 --> NaBr
b)
KClO3 --> KCl + O2
c)
HgO + Cl2-->HgCl + O2
d)
Cl2 + NaBr --> NaCl + Br2
18.
Balance this reaction:
____ Na3PO4 + ____ KOH ---> ____ NaOH + ____ K3PO4
a)
1,3,3,1
b)
1,3,2,1
c)
2,3,3,1
d)
1,1,3,1
19.
Balancing this reaction:
____ CH4 + ____ O2 ---> ___ CO2 + ____ H2O
a)
2,1,3,1
b)
1,2,1,2
c)
1,2,2,1
d)
2,1,1,2
20.
Balance this reaction:
____ RbNO3 + ____ BeF2 ----> ____ Be(NO3)2 + ____ RbF
a)
1,1,1,1
b)
1,2,1,1
c)
2,1,1,2
d)
2,1,2,1
21.
When balancing equations, the rule is that you can only add, change, and remove
a)
Coefficients
b)
Mass
c)
Subscripts
d)
Elements
22.
Balance the following:
Aluminum nitrate and Carbonic acid react to form
Aluminum carbonate and Nitric acid
a)
4,1,2,5
b)
1,3,6,2
c)
2,1,3,6
d)
2,3,1,6
23.
The following reaction is an example of what reaction type?
CoCO3 → CoO + CO2
CoCO3 → CoO + CO2
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
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