Reversible reactions in a sealed container
3 marks · EasyThis question is about sealed containers and reversible reactions.
State what a sealed container means in the context of a chemical reaction.
Give one reason why using a sealed container is important when studying reversible reactions.
Suggest one thing that is allowed to change in a sealed container during a reaction.
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(a) No substances can enter or leave the reaction mixture. · must show no substances in or out
(b) It prevents loss of reactants or products. · must show prevents escape or addition
(c) Heat/temperature can change. · must show heat, temperature
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · Defines sealed container as not allowing substances to enter or leave (or similar wording).
B1 (b) · 1 mark · Gives valid reason: prevents loss or gain of substances.
B1 (c) · 1 mark · Identifies heat/temperature as something that can change.
Worked solution
a) A sealed container is one where no substances may enter or leave the reaction mixture.
b) It is important so that none of the reactants or products escapes during a reversible reaction.
c) The amount of heat or temperature inside the container can change.