AQA · Chemistry · 8462
GCSE Chemistry: Energy changes and reversible reactions
The rate and extent of chemical change · AQA GCSE Chemistry (8462), specification point 4.6.2.2. Cards are generated from the exam board's own specification for "Energy changes and reversible reactions", and every card links back to the page it came from. Specification © AQA — used with attribution.
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In a reversible reaction, if the forward reaction is exothermic, what is the reverse reaction?
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Endothermic.
If a reversible reaction is exothermic in one direction, it is ? in the opposite direction.
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endothermic
How does the energy absorbed in the endothermic direction of a reversible reaction compare with the energy released in the exothermic direction?
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They are equal — the same amount of energy is transferred in each direction.
In a reversible reaction, the ? amount of energy is transferred in the forward direction as in the reverse direction.
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same
The forward direction of a reversible reaction releases 50 kJ of energy. How much energy does the reverse direction absorb?
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50 kJ — the reverse direction transfers the same amount of energy, but is endothermic.
Why must the reverse of an exothermic reversible reaction be endothermic?
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Energy is conserved: the energy released to the surroundings when products form must be taken back in to turn the products into reactants again.
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