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5.1 Exothermic and endothermic reactions

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Question 29

A technician is testing two reactions as possible ways to warm a cold object. For each reaction, the temperature of the surroundings is recorded.

ReactionStarting temperatureTemperature after mixing
A19.0 ∘C19.0\ ^\circ\text{C}19.0 ∘CHighest: 26.0 ∘C26.0\ ^\circ\text{C}26.0 ∘C
B19.0 ∘C19.0\ ^\circ\text{C}19.0 ∘CLowest: 14.0 ∘C14.0\ ^\circ\text{C}14.0 ∘C

Which conclusion is correct?

[1]
A

Select reaction A; its products are at a lower energy than its reactants.

B

Select reaction A; its products are at a higher energy than its reactants.

C

Select reaction B; its products are at a lower energy than its reactants.

D

Select reaction B; its products are at a higher energy than its reactants.

Markscheme

5.1 Exothermic and endothermic reactions Questions

  1. GCSE
  2. /Chemistry
  3. /5.1 Exothermic and endothermic reactions

85 exam-style questions on AQA GCSE Chemistry 5.1 Exothermic and endothermic reactions, covering 5.1.1 Energy transfer during exothermic and endothermic reactions, 5.1.2 Reaction profiles, and 5.1.3 The energy change of reactions. Each one has a worked solution and a mark scheme showing where the marks go.

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