CIE iGCSE Co-Ordinated Science C11.7 Polymers Exam Style Questions Paper 3
Question
(a) Fig. 8.1 shows the separation of petroleum into useful fractions.
Only two fractions are shown.
(i) Petroleum is a fossil fuel.
State the name of one other fossil fuel.
(ii) State the name of the process shown in Fig. 8.1.
(iii) State the name of one fraction not shown in Fig. 8.1.
(iv) State one use for each of the fractions shown in Fig. 8.1.
refinery gas ……………………………………………………………………………..
diesel oil …………………………………………………………………………………..
(b) Cracking is a process that produces small alkene molecules from larger alkane molecules.
Ethane is an alkane.
Ethene is an alkene.
Fig. 8.2 shows the structure of ethane, C2H6.
Draw the structure of ethene, C2H4.
(c) Ethene is used to make a polymer.
(i) State the name of the polymer that is made from ethene.
(ii) State the type of polymerisation reaction that makes this polymer from ethene.
▶️Answer/Explanation
Ans : 8(a)(i) coal / natural gas ;
8(a)(ii) fractional distillation ;
8(a)(iii) gasoline / naphtha / bitumen ;
8(a)(iv) (bottled gas for) heating and cooking ;
fuel for diesel engines ;
8(b) 
carbon carbon double bond ;
all else correct ;
8(c)(i) poly(ethene) ;
8(c)(ii) addition (polymerisation) ;
Question
(a) The list below shows some chemical processes.
chlorination chromatography cracking
crystallisation decomposition
electrolysis fractional distillation polymerisation
Identify the process from the list that is used:
(i) in the treatment of drinking water
…………………………………………………………………………………………………………………….
(ii) to separate a mixture of dyes
…………………………………………………………………………………………………………………….
(iii) to extract aluminium from bauxite
…………………………………………………………………………………………………………………….
(iv) to produce long chain molecules from monomer units.
…………………………………………………………………………………………………………………….
(b) When dilute hydrochloric acid is added to aqueous sodium hydroxide, a neutralisation reaction occurs.
Fig. 2.1 shows apparatus used to investigate the change in pH as the acid is added.
(i) State the name of apparatus A.
…………………………………………………………………………………………………………………….
(ii) State the reading on the pH meter when the dilute hydrochloric acid exactly neutralises
the aqueous sodium hydroxide.
…………………………………………………………………………………………………………………….
(iii) State the two products of the reaction shown in Fig. 2.1.
1 ……………………………………………………………………………………………………………………….
2 ……………………………………………………………………………………………………………………….
(c) Describe what is observed when aqueous sodium hydroxide is added to blue copper(II) sulfate solution.
…………………………………………………………………………………………………………………………….
……………………………………………………………………………………………………………………………
▶️Answer/Explanation
Ans: 2(a)(i) chlorination ;
2(a)(ii) chromatography ;
2(a)(iii) electrolysis ;
2(a)(iv) polymerisation ;
2(b)(i) burette ;
2(b)(ii) 7 ;
2(b)(iii) sodium chloride ;
water ;
2(c) pale blue precipitate ;