Multiple Choice
1. When a candle burns, which two substances primarily react with each other during the combustion process?
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3. Chemical Reactions
Combustion Analysis
Multiple Choice
In a combustion analysis, what substance must methane (CH_4) be combined with to undergo a complete combustion reaction?
A
N_2 (nitrogen gas)
B
H_2O (water)
C
CO_2 (carbon dioxide)
D
O_2 (oxygen gas)
Verified step by step guidance1
Understand that a combustion reaction involves a hydrocarbon (like methane, CH_4) reacting with a substance that allows it to burn completely, producing carbon dioxide (CO_2) and water (H_2O).
Recall that for complete combustion, the hydrocarbon must react with oxygen gas, O_2, because oxygen supports the burning process and combines with carbon and hydrogen atoms in methane.
Write the general form of the complete combustion reaction for methane: \(\mathrm{CH_4 + O_2 \rightarrow CO_2 + H_2O}\).
Recognize that nitrogen gas (N_2) does not react in combustion but is often present in air; water (H_2O) and carbon dioxide (CO_2) are products, not reactants, in combustion.
Conclude that the substance methane must be combined with for complete combustion is oxygen gas, O_2.
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