Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
The Halogens
86 practice questions
Topics covered
Practice questions
21–30 of 35 · Normal
Question 21
1 mark · Normal
Answer and check →Which statement correctly explains why chlorine acts as an oxidising agent in its reaction with bromide ions?
- A.It loses electrons and is oxidised itself.
- B.It gives electrons to bromide ions.
- C.It gains electrons and is reduced.
- D.It forms a brown solution.
Question 22
2 marks · Normal
Answer and see the solution →Complete the ionic equation for the reaction between bromine and sodium iodide solution. Include state symbols.
Question 23
4 marks · Normal
Answer and see the solution →Two students discuss the reaction between chlorine and potassium iodide solution.
(a)[2 marks]Write the ionic equation for this reaction, including state symbols.
(b)[2 marks]Explain, using the meanings of oxidation and reduction, which substance is oxidised and which is reduced in this reaction.
Question 24
3 marks · Normal
Answer and see the solution →Chlorine gas is bubbled through a solution of sodium iodide. Write the balanced ionic equation for this reaction. Show, with working, the steps you use to remove spectator ions from the full ionic equation.
Question 25
2 marks · Normal
Answer and see the solution →State two trends that occur when you go down Group 7 (the halogens) in the Periodic Table.
Question 26
4 marks · Normal
Answer and see the solution →This question is about electrons and halogen reactivity.
(a)[1 mark]State the charge on the ion formed when a chlorine atom gains an electron.
(b)[3 marks]Explain, in terms of electron arrangement, why chlorine is more reactive than bromine.
Question 27
3 marks · Normal
Answer and see the solution →Explain why astatine is less reactive than bromine, in terms of atomic structure and electronic configuration.
Question 28
4 marks · Normal
Answer and see the solution →The table shows some properties of Group 7 elements.
Element Colour at room temperature State at room temperature Melting point (°C) Chlorine Green Gas -101 Bromine Red-brown Liquid -7 Iodine Dark grey Solid 114 (a)[2 marks]Predict the appearance and physical state of astatine at room temperature.
(b)[2 marks]Suggest a melting point for astatine, based on the trend in the table.
Question 29
1 mark · Normal
Answer and check →Which statement best explains why chlorine is more reactive than bromine?
- A.Chlorine has a higher nuclear charge than bromine.
- B.Chlorine has a smaller atomic radius, so its outer electrons are more strongly attracted to the nucleus.
- C.Chlorine forms positive ions more easily than bromine.
- D.Chlorine has more energy levels than bromine.
Question 30
2 marks · Normal
Answer and see the solution →State what you would observe if chlorine water is added to a solution of sodium iodide. Explain your answer.