Answer: A chemical reaction occurs when some substances change chemically to other substances. Chemical reactions are represented by chemical equations. Consider a simple chemical reaction, the burning of methane. In this reaction, methane (CH4) combines with oxygen (O2) in the air and produces carbon dioxide (CO2) and water vapor (H2O). The reaction is represented by the following chemical equation:
CH4 + 2O2 → CO2 + 2H2O
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