Hydrogen reacts with chlorine to form hydrogen chloride.
H2+Cl2→2HCl\text{H}_2 + \text{Cl}_2 \rightarrow 2\text{HCl}H2+Cl2→2HCl
| Bond | Bond energy in kJ/mol |
|---|---|
| H-H\text{H-H}H-H | 436 |
| Cl-Cl\text{Cl-Cl}Cl-Cl | 243 |
| H-Cl\text{H-Cl}H-Cl | 432 |
Calculate the overall energy change for this reaction.
Use your answer to part (a) to explain whether the reaction is exothermic or endothermic.
85 exam-style questions on AQA GCSE Chemistry 5.1 Exothermic and endothermic reactions, covering 5.1.1 Energy transfer during exothermic and endothermic reactions, 5.1.2 Reaction profiles, and 5.1.3 The energy change of reactions. Each one has a worked solution and a mark scheme showing where the marks go.