Multiple Choice
During combustion analysis, what happens to the atoms of a substance when it burns?
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3. Chemical Reactions
Combustion Analysis
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The complete combustion of which of the following substances produces only carbon dioxide and water?
A
SO2 (sulfur dioxide)
B
NH3 (ammonia)
C
C2H6 (ethane)
D
NaCl (sodium chloride)
Verified step by step guidance1
Understand that complete combustion of a substance means it reacts fully with oxygen to produce only carbon dioxide (CO\_2) and water (H\_2O).
Identify the types of elements present in each substance: SO\_2 contains sulfur and oxygen, NH\_3 contains nitrogen and hydrogen, C\_2H\_6 contains carbon and hydrogen, and NaCl contains sodium and chlorine.
Recall that complete combustion applies to hydrocarbons (compounds made of carbon and hydrogen) because they produce CO\_2 and H\_2O when burned completely.
Recognize that SO\_2 and NH\_3 contain elements other than carbon and hydrogen, so their combustion products will include other compounds besides CO\_2 and H\_2O.
Conclude that C\_2H\_6 (ethane), being a hydrocarbon, undergoes complete combustion to produce only carbon dioxide and water.
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