O-LevelChemistryRates of Reaction5070/11 · Oct/Nov 2019 · Q141 Mark

Which statement about exothermic and endothermic reactions is correct?

AIn an endothermic reaction, energy is used to break bonds but no energy is released when bonds form.

BIn an endothermic reaction, energy is released when bonds form but more energy is used to break bonds.

CIn an exothermic reaction, energy is released both by breaking and by forming bonds.

DIn an exothermic reaction, energy is released when bonds form but no energy is needed to break bonds.

✓ Correct answer

B: In an endothermic reaction, energy is released when bonds form but more energy is used to break bonds.

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2019 Paper 1 Variant 1, question 14.

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