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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)ΔH_1
(ii) ΔH_3
(b) Write an expression, for ΔH_3 in terms of ΔH_1 and ΔH_2

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