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5.1 Exothermic and endothermic reactions

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Question 5
F

Four reactions were carried out in a polystyrene cup. The table shows the results.

Table: The starting temperature and the final temperature of the mixture for four different reactions carried out in a polystyrene cup

ReactionStarting temperature in ∘C^\circ\text{C}∘CFinal temperature in ∘C^\circ\text{C}∘C
W21.018.5
X20.526.0
Y21.534.0
Z20.012.5

Which reaction takes in the most energy from the surroundings?

[1]
A

Reaction W, because its temperature falls by 2.5 ∘C2.5\ ^\circ\text{C}2.5 ∘C

B

Reaction X, because its temperature rises by 5.5 ∘C5.5\ ^\circ\text{C}5.5 ∘C

C

Reaction Y, because its temperature rises by 12.5 ∘C12.5\ ^\circ\text{C}12.5 ∘C

D

Reaction Z, because its temperature falls by 7.5 ∘C7.5\ ^\circ\text{C}7.5 ∘C

Markscheme

5.1 Exothermic and endothermic reactions Questions

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

39 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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