Chemistry · Oct / Nov 2025 · Paper 12 · Question 12
5070Exothermic and endothermic reactions
Which statement about reactions is correct?
- AA reaction in which the number of bonds broken equals the number of bonds formed always has an enthalpy change, ΔH = 0.
- BCombustion can be either exothermic or endothermic.
- CIn exothermic reactions, thermal energy is transferred to the surroundings, so the temperature of the surroundings increases.
- DThe activation energy, Ea, for a reaction is the minimum energy particles must have in order to collide.
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Correct answer: C. In exothermic reactions, thermal energy is transferred to the surroundings, so the temperature of the surroundings increases.
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