Explain how thermal decomposition supports this AQA GCSE Chemistry objective: identify thermal decomposition and the reaction of citric acid with sodium hydrogencarbonate as examples of endothermic reactions.

A strong answer should state the relevant chemistry idea, explain how it applies in Energy transfer during exothermic and endothermic reactions, and finish by linking back to Exothermic and endothermic reactions.

This answer is correct because it directly supports the approved learning objective: Identify thermal decomposition and the reaction of citric acid with sodium hydrogencarbonate as examples of endothermic reactions. It stays inside Energy transfer during exothermic and endothermic reactions, uses thermal decomposition as the revision focus, and gives the Chemistry reasoning needed for an exam-style response.