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Chemical reactions practice questions

Practise mixed syllabus-aligned questions for Chemical reactions. Aligned to OCR Gcse Chemistry A Gateway.

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A student investigates two different chemical reactions to classify them as endothermic or exothermic. Reaction A: Magnesium powder is added to dilute hydrochloric acid. The student feels the test tube get warm. Reaction B: Barium hydroxide is mixed with ammonium chloride. The student observes a significant drop in temperature. (a) For each reaction, state whether it is endothermic or exothermic. (b) Explain your reasoning for each classification based on the observations. [4 marks]

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