O-LevelChemistryRates of Reaction5070/11 · May/June 2012 · Q161 Mark

The combustion of methane is exothermic. The equation is given below. CH4 + 2O2 → CO2 + 2H2O What can be deduced from the fact that the reaction is exothermic?

AFewer bonds are broken than are made.

BLess energy is involved in breaking bonds than is involved in making bonds.

CMore bonds are broken than are made.

DMore energy is involved in breaking bonds than is involved in making bonds.

✓ Correct answer

B: Less energy is involved in breaking bonds than is involved in making bonds.

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2012 Paper 1 Variant 1, question 16.

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