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In a chemical reaction, ΔH is positive when

Chemistry
WAEC 2025

In a chemical reaction, ΔH is positive when

  • A. ΔH\(_{product}\) > ΔH\(_{reactants}\)
  • B. ΔH\(_{product}\) < ΔH\(_{reactants}\)
  • C. ΔH\(_{product}\) = ΔH\(_{reactants}\)
  • D. ΔH\(_{product}\) = 0
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Correct Answer: Option A
Explanation

In a chemical reaction, ΔH(change in enthalpy) is positive when the reaction is endothermic, meaning the system absorbs heat from its surroundings. i.e ΔH\(_{product}\) must be greater than ΔH\(_{reactant}\).

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