WAEC Chemistry 2025 Objective — Question 19
Question 19 of 50 from the West African Examinations Council (WAEC) Chemistry 2025 Objective paper, with the correct answer and a full explanation.
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In a chemical reaction, delta H is positive when
- A. delta H(products) > delta H(reactants)Correct
- B. delta H(products) < delta H(reactants)
- C. delta H(products) = delta H(reactants)
- D. delta H(products) = zero
Explanation
The change in enthalpy (delta H) is positive when the products have more enthalpy than the reactants. This indicates that the reaction is endothermic, meaning heat is absorbed during the reaction.
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