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Grade 9 Ecology Practice Exam

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Which equation represents the combustion of carbon compounds?
Correct Answer:
Methane + Oxygen = Carbon Dioxide + Water + Energy
Explanation:
Combustion is the oxidation of a carbon-containing fuel that releases energy as heat (and often light). In a combustion reaction, a carbon compound reacts with oxygen to form carbon dioxide and water, with energy released to the surroundings. The best choice shows methane, a carbon compound, reacting with oxygen to produce carbon dioxide and water and includes energy released as a product. This explicit energy term signals the exothermic nature of combustion, which is a defining feature. The other options don’t fit as clearly: one shows a non-combustion process, another forms nitrogen oxides, and a glucose–oxygen equation, while it represents burning a carbon compound, doesn’t explicitly show the energy release in the presented form.

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