Cambridge IGCSE Combined Science practice
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At a glance
4
Paper
4
Marks
Topic
Exothermic and endothermic reactions
Exam-style question
Understanding energy changes in reactions.
Description
Consider the following reactions: A + B → C (exothermic) and D + E → F (endothermic).
Compare the energy changes in the two reactions described above.
Aim for approximately 4 distinct marking points.
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Diagram Description
The diagram shows the energy levels of reactants and products, with a clear indication of activation energy and the energy change for the reaction.
Analyse the reaction pathway diagram provided, focusing on the energy changes involved in the reaction.
Aim for approximately 3 distinct marking points.