Fluorine, chlorine, bromine and iodine are elements in Group 7 of the Periodic Table.
Which element has the highest boiling point?
Which element is a red-brown liquid at room temperature?
Which element is a pale yellow gas at room temperature?
Bromine reacts with hydrogen to form hydrogen bromide. The equation for the reaction is:
H2(g)+Br2(g)→2HBr(g) \text{H}_2(\text{g}) + \text{Br}_2(\text{g}) \rightarrow 2\text{HBr}(\text{g}) H2(g)+Br2(g)→2HBr(g)The table shows some average bond energies:
| Bond | Average bond energy in kJ/mol |
|---|---|
| H−H\text{H}-\text{H}H−H | 436 |
| Br−Br\text{Br}-\text{Br}Br−Br | 193 |
| H−Br\text{H}-\text{Br}H−Br | 366 |
Use the values in the table to calculate the enthalpy change for the reaction between hydrogen and bromine.
33 exam-style questions on Edexcel IGCSE Chemistry Group 7 (halogens) – chlorine, bromine and iodine. Each one has a worked solution and a mark scheme showing where the marks go.