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Form 4 Energy Changes in Chemical and Physical Processes Questions and Answers

Sulphur burns in air to form sulphur (IV) oxide. A simple energy level diagram for the reaction is given below. Study the diagram and answer the questions that follow.

(a)What do the following represent?
(i)Δ $H_1$
(ii) Δ $H_3$
(b) Write an expression, for Δ $H_3$ in terms of Δ $H_1$ and Δ $H_2$

(3m 47s)

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