This question is about halogens and halides.
At room temperature iodine is
A a purple gas B a grey solid C a red-brown liquid D a green gas
Lithium reacts with chlorine to form lithium chloride. Balance the equation for this reaction:
…Li+…Cl2→…LiCl \dots\text{Li} + \dots\text{Cl}_2 \rightarrow \dots\text{LiCl} …Li+…Cl2→…LiClA 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 | chlorine added | bromine added | iodine added |
|---|---|---|---|
| sodium chloride | (not done) | no reaction | no reaction |
| potassium bromide | reaction occurs | (not done) | no reaction |
| sodium iodide | reaction occurs | reaction occurs | (not done) |
Explain why the student did not perform the three experiments marked '(not done)'.
Explain why there was no reaction when iodine solution was added to potassium bromide solution.
The student writes this word equation for one of the reactions:
chlorine+potassium bromide→potassium chlorine+bromine \text{chlorine} + \text{potassium bromide} \rightarrow \text{potassium chlorine} + \text{bromine} chlorine+potassium bromide→potassium chlorine+bromineThe 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 sodium iodide solution:
Cl2+…NaI→…⋯+…… \text{Cl}_2 + \dots\text{NaI} \rightarrow \dots\dots + \dots\dots Cl2+…NaI→…⋯+……State the meaning of the term redox.
The ionic equation for another reaction is:
Cl2+2Br−→2Cl−+Br2 \text{Cl}_2 + 2\text{Br}^- \rightarrow 2\text{Cl}^- + \text{Br}_2 Cl2+2Br−→2Cl−+Br2Explain which species is oxidised 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.