This question is about halogens and halides.
At room temperature bromine is
A a pale yellow gas B a grey solid C a red-brown liquid D a purple gas
Sodium reacts with bromine to form sodium bromide. Balance the equation for this reaction:
…Na+…Br2→…NaBr \dots\text{Na} + \dots\text{Br}_2 \rightarrow \dots\text{NaBr} …Na+…Br2→…NaBrA student carries out some experiments to investigate displacement reactions. She adds halogen solutions to halide solutions and observes whether a reaction occurs. The table shows her results.
| Halide solution | iodine added | bromine added | chlorine added |
|---|---|---|---|
| lithium chloride | no reaction | no reaction | (not done) |
| potassium bromide | no reaction | (not done) | reaction occurs |
| sodium iodide | (not done) | reaction occurs | reaction occurs |
Explain why the student did not perform the three experiments marked '(not done)'.
Explain why there was no reaction when bromine solution was added to lithium chloride solution.
The student writes this word equation for one of the reactions:
bromine+sodium iodide→sodium bromine+iodine \text{bromine} + \text{sodium iodide} \rightarrow \text{sodium bromine} + \text{iodine} bromine+sodium iodide→sodium bromine+iodineThe name of one of the substances is incorrect. Write the correct name of this substance.
Complete and balance the chemical equation for the reaction when chlorine solution is added to potassium bromide solution:
Cl2+…KBr→…⋯+…… \text{Cl}_2 + \dots\text{KBr} \rightarrow \dots\dots + \dots\dots Cl2+…KBr→…⋯+……State the meaning of the term redox.
The ionic equation for another reaction is:
Br2+2I−→2Br−+I2 \text{Br}_2 + 2\text{I}^- \rightarrow 2\text{Br}^- + \text{I}_2 Br2+2I−→2Br−+I2Explain which species is reduced in this reaction.
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.