Question Constellation Sign up for free AQA · GCSE · Chemistry · Higher
Bicycle chain rust prevention
Bicycle chains are made from an alloy of iron. Bicycle chains rust without protection. Paint is not used to protect bicycle chains from rusting.
Suggest how bicycle chains can be protected from rusting.
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Marking points
- 1 Suggests an accepted protection: grease, oil, galvanising, or using stainless steel.
Full-mark answer
Coat the bicycle chain with grease or oil to keep out water and oxygen.
Why this answer loses marks
Cover the bicycle chain with paint.
The prompt rules out paint; a moving chain needs another protection method such as a grease or oil barrier.