Multiple Choice
During the combustion of gasoline in a car engine, which of the following chemical components is most commonly released in the exhaust?
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3. Chemical Reactions
Combustion Analysis
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When fossil fuels, which are primarily hydrocarbons, are burned during combustion analysis, what substance do they react with?
A
Oxygen (O_2)
B
Nitrogen (N_2)
C
Carbon dioxide (CO_2)
D
Water (H_2O)
Verified step by step guidance1
Understand that combustion is a chemical reaction where a substance reacts with a gas to produce heat and new products.
Recall that hydrocarbons are compounds made of carbon and hydrogen atoms, and when they burn, they typically react with oxygen.
Recognize that oxygen (O\_2) is the reactant that combines with hydrocarbons during combustion to form carbon dioxide (CO\_2) and water (H\_2O).
Note that nitrogen (N\_2), carbon dioxide (CO\_2), and water (H\_2O) are not reactants in the combustion process but can be products or present in the environment.
Conclude that the substance hydrocarbons react with during combustion is oxygen (O\_2).
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