Combustion starter
Task
1. Match up these half sentences.
Combustion is the scientific
you need oxygen.
For combustion to occur
word for burning.
Incomplete combustion occurs
carbon monoxide and water.
Complete combustion produces
when there is not much oxygen.
Incomplete combustion produces
carbon dioxide and water.
2. Finish these word equations. Each one should show complete combustion.
a. methane + .......................... → carbon dioxide + water
b. ethane + oxygen → ...................... + ...............................
c. hexane + ......................... → .......................... + .........................
3. This paragraph explains the advantages of complete combustion over incomplete
combustion. Use the words below to fill in the gaps.
incomplete
complete
oxygen
more
less
carbon
poisonous
a. Incomplete combustion produces ......................... soot than complete
combustion.
b. Soot is unburned ................................... .
c. Complete combustion releases ............................... heat than incomplete
combustion.
d. Carbon monoxide is a ....................... gas.
e. .............................. combustion does not produce poisonous carbon
monoxide.
© www.teachitscience.co.uk 2016
25926
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Combustion starter
Answers
1.
a. Combustion is the scientific word for burning.
b. For combustion to occur you need oxygen.
c. Incomplete combustion occurs when there is not much oxygen.
d. Complete combustion produces carbon dioxide and water.
e. Incomplete combustion produces carbon monoxide and water.
2.
a. methane + oxygen → carbon dioxide + water
b. ethane + oxygen → carbon dioxide + water
c. hexane + oxygen → carbon dioxide + water
3.
a. Incomplete combustion produces more soot than complete combustion.
b. Soot is unburned carbon.
c. Complete combustion releases more thermal energy than incomplete combustion
d. Carbon monoxide is a poisonous gas.
e. Complete combustion does not produce poisonous carbon monoxide.
© www.teachitscience.co.uk 2016
25926
Page 2 of 2