Question 7:
Diagram 7.1 shows various use of synthetic rubber.
(b) State two characteristics of synthetic rubber which is used to make shoe soles. [2 marks]
Answer:
(a) Tyre
(b)
1. Heat resistant
2. Hard
3. Water resistant
(Choose any two)
(c)(i) Vulcanisation
(c)(ii)
Diagram 7.1 shows various use of synthetic rubber.
Diagram 7.1
(b) State two characteristics of synthetic rubber which is used to make shoe soles. [2 marks]
(c) Diagram 7.2 shows the formation of vulcanised rubber.
Diagram 7.2
(i) What is process R? [1 mark]
(ii) Draw the structure of vulcanised rubber in the space provided on Diagram 7.2. [1 mark]
(iii) State one function of sulphur in the formation of vulcanised rubber. [1 mark]
Answer:
(a) Tyre
(b)
1. Heat resistant
2. Hard
3. Water resistant
(Choose any two)
(c)(i) Vulcanisation
(c)(ii)
(c)(iii) To prevent rubber polymer from sliding with each other