During combustion, what happens to oxygen and carbon dioxide?

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Prepare for the WJEC GCSE Chemistry Exam with multiple choice questions and detailed explanations. Enhance your knowledge and boost your confidence. Get exam-ready today!

Multiple Choice

During combustion, what happens to oxygen and carbon dioxide?

Explanation:
During combustion, a fuel reacts with oxygen to form energy, carbon dioxide, and water. Oxygen is a reactant, so its amount in the surroundings decreases as the reaction proceeds. Carbon dioxide is a product, so its amount increases. That means oxygen goes down while carbon dioxide goes up, which is exactly what happens in a complete combustion reaction. The other possibilities would imply oxygen increasing or CO2 decreasing, which doesn’t happen because you’re consuming O2 and producing CO2.

During combustion, a fuel reacts with oxygen to form energy, carbon dioxide, and water. Oxygen is a reactant, so its amount in the surroundings decreases as the reaction proceeds. Carbon dioxide is a product, so its amount increases. That means oxygen goes down while carbon dioxide goes up, which is exactly what happens in a complete combustion reaction. The other possibilities would imply oxygen increasing or CO2 decreasing, which doesn’t happen because you’re consuming O2 and producing CO2.

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