Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Organic Chemistry
785 practice questions
Topics covered
Practice questions
691–700 of 785
Question 691
3 marks · Normal
Answer and see the solution →A sample of poly(ethene) contains 250 repeat units. Each repeat unit has the formula -CH2CH2-.
Calculate the total number of carbon atoms and hydrogen atoms in the polymer chain.
Question 692
3 marks · Normal
Answer and see the solution →Poly(bromopropene) is made by the addition polymerisation of the monomer CH2=CHCH2Br.
Explain how you could deduce the structure of the monomer from the structure of the polymer poly(bromopropene).
Question 693
4 marks · Normal
Answer and see the solution →The table below shows information about several polymers and their monomer units.
(a)Polymer and monomer data Polymer Monomer formula poly(ethene) CH2=CH2 poly(chloroethene) CH2=CHCl poly(fluoroethene) CH2=CHF (i)[1 mark]State the feature common to all these monomers that enables them to undergo addition polymerisation.
(ii)[2 marks]Explain, with reference to the table, how the structure of the repeat unit of poly(chloroethene) is related to its monomer.
(iii)[1 mark]Name one use of poly(chloroethene).
Question 694
1 mark · Normal
Answer and check →Which structural change occurs when ethene polymerises to form poly(ethene)?
- A.The double bond between carbon atoms breaks to form single bonds
- B.A chlorine atom replaces one hydrogen atom
- C.The carbon chain becomes branched
- D.Two molecules combine with loss of water
Question 695
2 marks · Normal
Answer and see the solution →A student is given a sample of a polymer with the following repeat unit:
Give:
(a)[1 mark]the name of the polymer
(b)[1 mark]the formula of the monomer used to make this polymer
Question 696
4 marks · Normal
Answer and see the solution →The polymer poly(methylpropene) is formed from the monomer CH2=C(CH3)2.
(a)[1 mark]Draw the displayed formula of the monomer CH2=C(CH3)2.
(b)[2 marks]Show the displayed formula of the repeat unit of poly(methylpropene). Label the continuation bonds at each end.
(c)[1 mark]Explain why the repeat unit retains both methyl groups on the same carbon as in the monomer.
Question 697
2 marks · Hard
Answer and see the solution →The displayed formula below shows the repeat unit of a polymer formed by addition polymerisation.
State the name and molecular formula of the monomer that forms this polymer.
Question 698
5 marks · Hard
Answer and see the solution →A polymer contains the following repeat unit:
(a)[2 marks]Draw the displayed formula of the monomer used to make this polymer.
(b)[2 marks]Write the name and molecular formula of this monomer.
(c)[1 mark]Explain why the double bond in the monomer is important for the polymerisation reaction.
Question 699
2 marks · Hard
Answer and see the solution →The monomer CH2=CHCH2F can undergo addition polymerisation.
Write the formula for the repeat unit of the polymer formed and state its name.
Question 700
1 mark · Easy
Answer and see the solution →State why addition polymers such as poly(ethene) are considered non-biodegradable.