Multiple Choice
Which term refers to the minimum temperature at which a substance will undergo sustained combustion?
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3. Chemical Reactions
Combustion Analysis
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When a hydrocarbon undergoes combustion in air, which component of air reacts directly with the hydrocarbon?
A
Argon (Ar)
B
Oxygen (O_2)
C
Nitrogen (N_2)
D
Carbon dioxide (CO_2)
Verified step by step guidance1
Understand that combustion is a chemical reaction where a substance reacts with oxygen to produce heat and usually light.
Recall that air is composed mainly of nitrogen (N_2) and oxygen (O_2), with small amounts of other gases like argon (Ar) and carbon dioxide (CO_2).
Identify that in combustion reactions, the hydrocarbon reacts specifically with oxygen (O_2) to form carbon dioxide (CO_2) and water (H_2O).
Recognize that nitrogen (N_2) and argon (Ar) are generally inert under combustion conditions and do not react directly with the hydrocarbon.
Conclude that the component of air that reacts directly with the hydrocarbon during combustion is oxygen (O_2).
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