Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Reactions of the halogens
19 practice questions
Practice questions
11–19 of 19
Question 11
3 marks · Normal
Answer and see the solution →Explain, in terms of group trends, why iodine does not displace chlorine from a solution of sodium chloride. Include reference to reactivity and position in the group.
Question 12
4 marks · Normal
Answer and see the solution →The table below shows the appearance of three halogens at room temperature. Some data is missing. Complete the table.
Appearance of halogens at room temperature Halogen Physical state Colour Chlorine green Bromine red-brown Iodine Write your answers for the missing physical states and colour.
Question 13
1 mark · Normal
Answer and check →Which statement correctly explains why potassium iodide reacts with chlorine water?
- A.Chlorine is less reactive than iodine, so it is displaced by iodine.
- B.Iodine is more reactive than chlorine, so it displaces chlorine from the solution.
- C.Chlorine is more reactive than iodine, so it displaces iodine from potassium iodide.
- D.Iodine forms a stronger bond with potassium, so it replaces chlorine.
Question 14
2 marks · Normal
Answer and see the solution →State the colour change you would observe when chlorine gas is bubbled through a solution of potassium iodide.
Question 15
3 marks · Normal
Answer and see the solution →The melting and boiling points of the halogens increase down the group.
Chlorine is a gas at room temperature (25 B0C) and boils at 76 B0C. Bromine is a liquid at room temperature and boils at 59 B0C. Iodine is a solid at room temperature and sublimes at 84 B0C.
(a)[2 marks]Use the information above to state the physical state (solid, liquid or gas) of each halogen at room temperature (7F25 B0C).
(b)[1 mark]Explain, using the relative molecular mass and forces present, why the melting and boiling points increase from chlorine to iodine.
Question 16
4 marks · Normal
Answer and see the solution →The halogens react with metals and can also displace each other from solutions of their salts.
(a)[1 mark]State what is meant by a displacement reaction involving the halogens.
(b)[1 mark]Write a word equation for the reaction between bromine and potassium iodide solution.
(c)[2 marks]Explain why chlorine can displace bromine from sodium bromide solution, but iodine cannot.
Question 17
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 18
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 19
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.