Reversible reactions in a sealed container

2 marks · Normal

State what is meant by a sealed container in the context of reversible reactions. Give two essential features.

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Also accept: No substances can escape or be added; only heat may enter or leave; The container is shut so that reactants and products cannot escape; only energy can be exchanged

Common mistakes: Saying the container is airtight without mentioning no substances enter or leave; Thinking a sealed container allows gases to escape

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Marking points

B1 · 1 mark · States that no substances are added or escape from the container

B2 · 1 mark · Mentions that the system is closed for matter but energy (heat) can still enter or leave

Worked solution

A sealed container in reversible reactions means that:

1. No substances (reactants or products) are added to or leave the container.

2. Only energy in the form of heat can be exchanged with the surroundings.