Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Reactions of the halogens
19 practice questions
Practice questions
1–8 of 8 · Easy
Question 1
1 mark · Easy
Answer and see the solution →State the physical state of bromine at room temperature.
Question 2
3 marks · Easy
Answer and see the solution →This question is about halogen reactions.
(a)[1 mark]Describe what happens when chlorine reacts with sodium metal.
(b)[1 mark]Name the compound formed in this reaction.
(c)[1 mark]Explain why sodium reacts with chlorine instead of iodine in terms of halogen reactivity.
Question 3
2 marks · Easy
Answer and see the solution →Explain, in terms of reactivity, why iron reacts more rapidly with chlorine than with bromine.
Question 4
3 marks · Easy
Answer and see the solution →The table below shows information about the appearance and melting points of chlorine, bromine, and iodine. Some data is missing.
Halogen Properties Halogen Colour at room temperature Physical state at room temperature Melting point (°C) Chlorine Pale green Gas -101 Bromine Liquid -7 Iodine Grey-black 114 (a)[2 marks]Complete the table: (i) the colour of bromine at room temperature, and (ii) the physical state of iodine at room temperature.
(b)[1 mark]Based on the table, describe the trend in melting points down the group.
Question 5
1 mark · Easy
Answer and see the solution →State whether bromine can displace iodine from potassium iodide solution. Give your answer as 'yes' or 'no'.
Question 6
3 marks · Easy
Answer and see the solution →The properties of the halogens are shown in the list below.
(a)[1 mark]Name the halogen that is a pale green gas at room temperature.
(b)[1 mark]State the colour of solid iodine.
(c)[1 mark]Describe the electrical conductivity of the halogens at room temperature.
Question 7
2 marks · Easy
Answer and see the solution →A sample contains equal volumes of chlorine and bromine at room temperature. Chlorine is a green gas and bromine is a red-brown liquid under these conditions. Calculate the total number of different physical states present in the sample, and state the color for each state.
Question 8
2 marks · Easy
Answer and see the solution →A student adds chlorine to a solution containing sodium bromide. The student starts with 0.100 mol of sodium bromide. After the reaction, all the bromide ions have reacted. Calculate the maximum number of moles of bromine that could be formed, and explain your reasoning.