Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
The Halogens
86 practice questions
Topics covered
Practice questions
1–10 of 15 · Hard
Question 1
2 marks · Hard
Answer and see the solution →State the physical state and the colour of bromine at room temperature. Give one property of halogens that is the same for chlorine, bromine, and iodine.
Question 2
5 marks · Hard
Answer and see the solution →This question is about the reactivity of halogens and their displacement reactions.
(a)[1 mark]Write a balanced chemical equation for the reaction between bromine and potassium iodide solution.
(b)[2 marks]Explain why a reaction occurs between bromine and potassium iodide solution. Refer to the reactivity of the halogens in your answer.
(c)[1 mark]Describe what you would see during this reaction.
(d)[1 mark]Name the solution you would use to confirm the presence of iodine formed in this reaction. State the colour observed.
Question 3
2 marks · Hard
Answer and see the solution →A science teacher has three sealed containers, each holding one of the following halogens at room temperature (25°C):
(a)[1 mark]One container holds a halogen which is a red-brown liquid at room temperature. Name this halogen and state its physical state at room temperature.
(b)[1 mark]Another container holds a halogen that is a grey-black solid at room temperature. Name this halogen and state its colour at room temperature.
Question 4
2 marks · Hard
Answer and see the solution →Potassium bromide solution is added to separate solutions of chlorine and iodine. Describe what you would observe in each case, and explain why these observations are different.
Question 5
5 marks · Hard
Answer and see the solution →A student adds solutions of bromine and iodine to separate samples of potassium chloride and potassium iodide. The results are summarised below:
Summary of Observed Colour Changes Added halogen solution Potassium chloride solution Potassium iodide solution Bromine No change Brown colour appears Iodine No change No change Use the information and your knowledge of halogen reactivity to answer the following.
(a)[1 mark]Write a balanced chemical equation for the reaction that occurs when bromine solution is added to potassium iodide solution.
(b)[2 marks]Explain why there is no reaction when bromine solution is added to potassium chloride solution.
(c)[2 marks]Describe and explain the difference in the observations when bromine and iodine solutions are added to potassium iodide solution.
Question 6
2 marks · Hard
Answer and see the solution →State and explain the trend in the reactivity of chlorine, bromine and iodine as shown by their displacement reactions.
Question 7
2 marks · Hard
Answer and see the solution →Write the balanced ionic equation, including state symbols, for the reaction that occurs when chlorine gas is bubbled through a solution containing sodium bromide. Do not include spectator ions.
Question 8
5 marks · Hard
Answer and see the solution →Iodine solution is added to potassium chloride solution. No reaction is observed. Consider the redox processes involved in displacement reactions between halogens and halide ions.
(a)[2 marks]Explain, in terms of electron transfer, why iodine does not displace chloride ions from potassium chloride solution.
(b)[2 marks]A reaction does occur when bromine water is added to potassium iodide solution. State which species is oxidised and which is reduced in this reaction.
(c)[1 mark]Write the balanced ionic equation, including state symbols, for the reaction between bromine solution and iodide ions.
Question 9
2 marks · Hard
Answer and see the solution →Complete the ionic equation, including state symbols, for the reaction of fluorine gas with potassium bromide solution.
Question 10
2 marks · Hard
Answer and see the solution →Astatine is the halogen below iodine in Group 7. Predict the colour and state you would expect for astatine at room temperature, based on group trends.