Group 7 elements (halogens) react with halides in solution.
Chlorine reacts with potassium bromide to form potassium chloride and bromine.
Cl2(aq)+2KBr(aq)→2KCl(aq)+Br2(aq)\text{Cl}_2(\text{aq}) + 2\text{KBr}(\text{aq}) \rightarrow 2\text{KCl}(\text{aq}) + \text{Br}_2(\text{aq})Cl2(aq)+2KBr(aq)→2KCl(aq)+Br2(aq)
Describe what you would observe in the reaction.
This is the half equation that shows what happens to chlorine. Cl2+2e−→2Cl−\text{Cl}_2 + 2\text{e}^- \rightarrow 2\text{Cl}^-Cl2+2e−→2Cl− Explain why this half equation shows reduction.
Write the balanced half equation for the reaction of the bromide ions.
Chlorine displaces bromine from potassium bromide because chlorine is more reactive than bromine. Explain why chlorine is more reactive than bromine.
The diagram shows the mass spectrum for a compound containing chlorine.
State the relative molecular mass of the heavier molecular ion of this compound.
Instrumental methods of analysis, such as mass spectrometry, have advantages over simple chemical methods of analysis. State two advantages of instrumental methods of analysis.