Chemistry 9701 · AS & A Level · Chemical energetics

Chemical energetics — practice question

Several bond energy values are given below. These bond energy values are connected to the following four reactions: $\text{P: } \text{Br}_2 \rightarrow 2\text{Br}$ $\text{Q: } 2\text{Cl} \rightarrow \text{Cl}_2$ $\text{R: } \text{CH}_3 + \text{Cl} \rightarrow \text{CH}_3\text{Cl}$ $\text{S: } \text{CH}_4 \rightarrow \text{CH}_3 + \text{H}$ In what sequence should the enthalpy changes for these reactions be arranged, from the most negative to the most positive?

  • AP e Q e R e S
  • BQ e R e S e P
  • CR e Q e P e S
  • DS e P e Q e R

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