CAIE IGCSE Chemistry Energy in Bond Breaking and Making

Practise explaining reaction energy changes by comparing energy absorbed to break reactant bonds with energy released when product bonds form.

Exam points

state that breaking bonds absorbs energy while forming bonds releases energy
classify a reaction as exothermic when bond formation releases the greater amount
classify a reaction as endothermic when breaking reactant bonds requires more energy

[Maximum number: 1]

Chloroethene $\left(\mathrm{CH}_{2}=\mathrm{CHCl}\right)$ can be manufactured from 1,2-dichloroethane $\left(\mathrm{CH}_{2} \mathrm{ClCH}_{2} \mathrm{Cl}\right)$ .
The equation can be represented as shown.

Figure for Question 5.1.7—Bond breaking is an endothermic question 1 — CAIE IGCSE Chemistry

Deduce whether the energy change for this reaction is exothermic or endothermic.

Give a reason for your answer.

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5.1.7—Bond breaking is an endothermic question 1