Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
The Halogens
86 practice questions
Topics covered
Practice questions
81–86 of 86
Question 81
6 marks · Normal
Answer and see the solution →(a)[1 mark]State the physical state and color of chlorine at room temperature.
(b)[2 marks]Describe what you would observe when chlorine gas is bubbled through a solution of potassium iodide.
(c)[2 marks]Write a balanced chemical equation for the reaction in part b.
(d)[1 mark]Explain why this reaction happens in terms of the reactivity of the halogens.
Question 82
6 marks · Normal
Answer and see the solution →(a)[2 marks]Explain, with the aid of a balanced equation, what happens when sodium reacts with bromine.
(b)A student adds bromine water to a solution of potassium iodide in a test tube.
(i)[1 mark]State what you would observe.
(ii)[2 marks]Write a balanced equation for the reaction.
(iii)[1 mark]Explain why bromine can displace iodine in this reaction but not chlorine.
Question 83
6 marks · Normal
Answer and see the solution →A teacher wants to compare the reactivity of chlorine, bromine and iodine using displacement reactions with metal halide solutions.
(a)[2 marks]Chlorine is bubbled into a solution of potassium bromide. The solution turns orange. Explain why this colour change occurs. Include what is formed.
(b)[2 marks]A student adds bromine water to a solution of potassium chloride. No visible change is seen. Explain this observation, referring to relative reactivity.
(c)[2 marks]State and explain which halogen is the least reactive out of chlorine, bromine and iodine.
Question 84
7 marks · Hard
Answer and see the solution →This question is about the properties and reactions of halogens.
(a)[2 marks]State the physical state and colour of bromine and iodine at room temperature (20 °C).
(b)Aqueous chlorine is added to a solution containing potassium iodide. The solution changes colour.
(i)[2 marks]Write the ionic equation, including state symbols, for the reaction that takes place.
(ii)[2 marks]Explain why chlorine can displace iodine from potassium iodide solution but not the other way around.
(iii)[1 mark]Identify the oxidising agent and the substance that is reduced in this reaction.
Question 85
7 marks · Hard
Answer and see the solution →This question is about halogens and redox processes in their reactions.
(a)[2 marks]Describe the appearance and physical state of chlorine and iodine at room temperature.
(b)Bromine water is added to a solution of potassium iodide. The following reaction occurs:
(i)[2 marks]In terms of oxidation and reduction, explain which species is reduced and which is oxidised in the reaction.
(ii)[3 marks]State the colour change that is observed during this reaction. Explain the reason for this change.
Question 86
8 marks · Hard
Answer and see the solution →This question is about the reactions between halogens and halide ions.
(a)[2 marks]Chlorine water is added to a solution of sodium bromide.
Write the ionic equation for the reaction that takes place.
(b)[2 marks]Explain why chlorine is able to displace bromine from sodium bromide solution but not the other way around.
(c)The reaction between chlorine and sodium bromide is a redox reaction.
For this reaction:
(i)[2 marks]Identify which species is oxidised and which is reduced.
(ii)[2 marks]Use your knowledge of electron transfer to explain your answer to part (c)(i).