ExpertEasy1 markShort Answer
AQA GCSE · Question 02.3 · Chemistry of the atmosphere
Oxygen is needed to burn fuels. Name the source of the oxygen needed to burn fuels.
Oxygen is needed to burn fuels. Name the source of the oxygen needed to burn fuels.
How to approach this question
Think about where the oxygen for everyday combustion processes (like burning wood, gas stoves, or fuel in a car) comes from. What surrounds us that is rich in oxygen?
Full Answer
The air / atmosphere
Combustion (burning) is a chemical reaction between a fuel and an oxidant, usually oxygen, to produce heat. The most readily available source of oxygen on Earth is the air that makes up our atmosphere. The air is approximately 21% oxygen.
Common mistakes
✗ Naming a specific gas like "oxygen" instead of its source.
✗ Naming an incorrect source like "water" or "plants".
Practice the full AQA GCSE Chemistry Foundation Tier Paper 2
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