Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Organic Chemistry
785 practice questions
Topics covered
Practice questions
671–680 of 785
Question 671
4 marks · Normal
Answer and see the solution →Poly(ethene) is made from ethene by addition polymerisation.
(a)[1 mark]Describe the conditions required for the polymerisation of ethene.
(b)[2 marks]Write the chemical equation, using displayed formulae, for the formation of poly(ethene) from ethene.
(c)[1 mark]Explain why nothing else is produced in this reaction.
Question 672
3 marks · Normal
Answer and see the solution →Explain why the preparation of addition polymers such as poly(ethene) does not produce any waste products. State one advantage and one disadvantage of this.
Question 673
4 marks · Normal
Answer and see the solution →The table below shows information about three addition polymers and the number of carbon atoms in their repeat units.
Polymer Monomer Number of C atoms in repeat unit Poly(ethene) ethene 2 Poly(propene) propene 3 Poly(chloroethene) chloroethene 2 (a)[1 mark]Which polymer in the table has a repeat unit containing the highest number of carbon atoms? Explain your answer.
(b)[2 marks]Draw the repeat unit for poly(propene).
(c)[1 mark]Name the monomer used to make poly(chloroethene).
Question 674
1 mark · Normal
Answer and check →Which statement about the preparation of poly(ethene) by addition polymerisation is correct?
- A.The monomers react and produce water as a by-product.
- B.The reaction requires a catalyst.
- C.The polymerisation uses up all atoms from the ethene monomers.
- D.It forms poly(ethene) and carbon dioxide.
Question 675
2 marks · Normal
Answer and see the solution →Give the name of the addition polymer formed from tetrafluoroethene, and draw its repeat unit using displayed formulae.
Question 676
4 marks · Normal
Answer and see the solution →Addition polymers such as poly(chloroethene) are made from small molecules called monomers.
(a)[1 mark]Name the type of reaction used to make poly(chloroethene).
(b)[1 mark]Describe the role of an initiator in the preparation of addition polymers.
(c)[1 mark]Draw the structure of chloroethene, the monomer used to make poly(chloroethene).
(d)[1 mark]State one use of poly(chloroethene).
Question 677
3 marks · Normal
Answer and see the solution →A monomer with the formula (chloroethene) undergoes addition polymerisation to form poly(chloroethene).
Calculate the relative molecular mass (Mr) of one repeat unit of poly(chloroethene).
Show your working, including the atomic masses you use, and draw the displayed formula of the repeat unit.
(a)[2 marks]Calculate the relative molecular mass (Mr) of one repeat unit of poly(chloroethene). Use these atomic masses: C = 12, H = 1, Cl = 35.5.
(b)[1 mark]Draw the displayed formula of one repeat unit of poly(chloroethene).
Question 678
2 marks · Hard
Answer and see the solution →The structure below shows part of a polymer chain.
State the name of the monomer used to make this polymer. Draw the displayed formula of the repeat unit for this polymer.
Question 679
5 marks · Hard
Answer and see the solution →Describe how poly(ethene) is prepared in the chemical industry.
(a)[1 mark]State the name and formula of the monomer used to make poly(ethene).
(b)[2 marks]Write the equation for the polymerisation reaction, using displayed formulae for both the monomer and the polymer's repeat unit, and including 'n' notation.
(c)[1 mark]State the type of reaction used to produce poly(ethene).
(d)[1 mark]Describe the essential conditions needed for this reaction.
Question 680
2 marks · Hard
Answer and see the solution →A student is given the displayed formula for the repeat unit of a polymer:
Deduce the structural formula of the monomer, and write its name.