WAEC Chemistry 2014 Theory — Question 6

Question 6 of 38 from the West African Examinations Council (WAEC) Chemistry 2014 Theory paper, with the correct answer and a full explanation.

1(e). Name the type of energy change that occurs in each of the following processes: (i) I₂(s)→I₂(g); (ii) Cl+e⁻→Cl⁻(g)

Model answer

(i) I₂(s)→I₂(g): Enthalpy/latent heat of sublimation (energy absorbed — endothermic). (ii) Cl+e⁻→Cl⁻(g): Electron affinity (energy released — exothermic).

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