Chemistry · Practice
Balancing Carbon Reactions
Name
Write a coefficient in every blank so each side has the same number of C, H, and O atoms. Use the lowest whole numbers. Write 1 when only one is needed.
3
CO + H2 → CH3OH
Synthesis
4
C2H2 + H2 → C2H6
Synthesis
5
CH4 → C + H2
Decomposition
6
CO → C + CO2
Decomposition
7
C6H12O6 → C2H5OH + CO2
Decomposition (fermentation)
8
C12H22O11 → C + H2O
Decomposition (sucrose)
9
CH4 + O2 → CO2 + H2O
Combustion
10
C3H8 + O2 → CO2 + H2O
Combustion
11
C2H4 + O2 → CO2 + H2O
Combustion
12
C2H5OH + O2 → CO2 + H2O
Combustion
13
C6H12O6 + O2 → CO2 + H2O
Combustion
14
C12H22O11 + O2 → CO2 + H2O
Combustion
15
C2H6 + O2 → CO2 + H2O
Combustion
16
CH3OH + O2 → CO2 + H2O
Combustion
17
C2H2 + O2 → CO2 + H2O
Combustion
18
C4H10 + O2 → CO2 + H2O
Combustion
19
CH4 + O2 → CO + H2O
Incomplete combustion
20
CO2 + H2O → C6H12O6 + O2
Photosynthesis
Chemistry · Practice Key
Balancing Carbon Reactions: Key
Gray 1s are coefficients usually left unwritten. Check any answer by counting C, H, and O on each side.
1
1C + 2H2 → 1CH4
Synthesis
2
2CO + 1O2 → 2CO2
Synthesis
3
1CO + 2H2 → 1CH3OH
Synthesis
4
1C2H2 + 2H2 → 1C2H6
Synthesis
5
1CH4 → 1C + 2H2
Decomposition
6
2CO → 1C + 1CO2
Decomposition
7
1C6H12O6 → 2C2H5OH + 2CO2
Decomposition (fermentation)
8
1C12H22O11 → 12C + 11H2O
Decomposition (sucrose)
9
1CH4 + 2O2 → 1CO2 + 2H2O
Combustion
10
1C3H8 + 5O2 → 3CO2 + 4H2O
Combustion
11
1C2H4 + 3O2 → 2CO2 + 2H2O
Combustion
12
1C2H5OH + 3O2 → 2CO2 + 3H2O
Combustion
13
1C6H12O6 + 6O2 → 6CO2 + 6H2O
Combustion
14
1C12H22O11 + 12O2 → 12CO2 + 11H2O
Combustion
15
2C2H6 + 7O2 → 4CO2 + 6H2O
Combustion
16
2CH3OH + 3O2 → 2CO2 + 4H2O
Combustion
17
2C2H2 + 5O2 → 4CO2 + 2H2O
Combustion
18
2C4H10 + 13O2 → 8CO2 + 10H2O
Combustion
19
2CH4 + 3O2 → 2CO + 4H2O
Incomplete combustion
20
6CO2 + 6H2O → 1C6H12O6 + 6O2
Photosynthesis