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5.1 Exothermic and endothermic reactions

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Question 27

Hydrogen reacts with chlorine to form hydrogen chloride:

H2+Cl2→2HCl \text{H}_2 + \text{Cl}_2 \rightarrow 2\text{HCl} H2​+Cl2​→2HCl
BondBond energy in kJ/mol
H-H436
Cl-Cl243
H-Cl432

Calculate the overall energy change for this reaction and state whether it is exothermic or endothermic.

[3]
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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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