Combustion is a reaction in which a substance reacts with:
Nitrogen
Hydrogen
Oxygen
Chlorine
A
Hydrogen
B
Nitrogen
C
Oxygen
D
Chlorine
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Solution
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Combustion is a chemical process where substance reacts with Oxygen to give off a lot of heat. So combustion reactions involve molecular oxygen O2.
When wood burns, it must do so in the presence of O2.
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