Reversible reactions in a sealed container
2 marks · HardState two essential features that define a sealed container in the context of reversible reactions.
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Also accept: the reaction mixture is closed to the surroundings; nothing enters or exits the container
Common mistakes: Saying 'air cannot enter' without stating substances in general.; Ignoring 'no substances added' or only mentioning one aspect.
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Marking points
B1 · 1 mark · States that no substances can escape from the container.
B2 · 1 mark · States that no substances can be added to the container.
Worked solution
A sealed container means:
1. No substances can escape from the reaction mixture.
2. No substances can be added to the reaction mixture.