Reversible reactions in a sealed container
2 marks · NormalState two reasons why no substances can escape from a sealed container during a reversible reaction.
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Also accept: The container is tightly closed / airtight; The container has no gaps or holes
Common mistakes: Only describing it is closed
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Marking points
B1 · 1 mark · Mentions airtight/tightly closed/no gaps
B2 · 1 mark · States that it prevents any gases or particles leaving
Worked solution
1. The container is tightly closed (airtight), so no reactants or products can escape.
2. There are no gaps or holes that would allow substances to leave during the reaction.