This question is about halogens and halides.
At room temperature bromine is
A a pale green gas B a grey crystalline solid C a red-brown liquid D a purple gas
Sodium reacts with bromine to form sodium bromide. Balance the equation for this reaction: \
\dots\text{Na} + \dots\text{Br}_2 \rightarrow \dots\text{NaBr}{\char"24}$A student carries out some experiments to investigate displacement reactions. She adds aqueous halogen solutions to aqueous halide solutions and observes whether a reaction occurs. The table shows her results.
| Halide solution | chlorine water added | bromine water added | iodine solution added |
|---|---|---|---|
| potassium chloride | (not done) | no reaction | no reaction |
| potassium bromide | reaction occurs | (not done) | no reaction |
| potassium iodide | reaction occurs | reaction occurs | (not done) |
Explain why the student did not perform the three experiments marked '(not done)'.
Explain why there was no reaction when bromine water was added to potassium chloride solution.
The student writes this word equation for one of the reactions: \
\text{chlorine} + \text{potassium iodide} \rightarrow \text{potassium chlorine} + \text{iodine}{\char"24}$ The 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 bromine water is added to potassium iodide solution: \
\text{Br}_2 + \dots\text{KI} \rightarrow \dots\dots + \dots\dots{\char"24}$State the meaning of the term reduction in terms of electron transfer.
The ionic equation for another reaction is: \
\text{Br}_2 + 2\text{I}^- \rightarrow 2\text{Br}^- + \text{I}_2{\char"24}$ Explain, in terms of electrons, which species is the oxidising agent 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.