Standard Grade Revision

1
Standard Grade Revision

• Unit 13

Q1. Some plastic bags are made from a synthetic
polymer called polythene. (a) What is
meant by the term synthetic? (b) Draw a
section of polythene showing three monomer units
joined together.        (c) Polythene is
not biodegradable. What is meant by
biodegradable?
Standard Grade Chemistry
2
Unit 13 Revision

• Q2 Ethene is used to make a variety of products.
  Some of these are shown below.

• Write the molecular formula for ethylene glycol.
• Name substance X.
• Poly(ethene) is a thermoplastic polymer.
• What is meant by the term
  thermoplastic?
• Name the process by which ethene is made from
  long chain
• hydrocarbon molecules.

(a) C2H6O2. (b) Water. (c) Softens on
heating. (d) Cracking.
Standard Grade Chemistry
3
Unit 13 Revision
Q3.
The handle of the cooking pot is made of a
polymer that does not melt when it gets hot. What
term is used to describe this type of polymer?
Thermosetting polymer.
Q4. Poly(ethene) is the most widely used polymer
in the word. 10 is used for pipes and 14
for films. Blow moulding uses 8 and
injection moulding another 28. Other uses
account for the remaining 40. Construct a
table with two headings to show all of this
information.
Standard Grade Chemistry
4
Unit 13 Revision.
Q4. Teflon is a brand name for the plastic
poly(tetrafluoroethene). (a) Name the type
of chemical reaction used to make plastics.
(b) Name the monomer used to make
poly(tetrafluoroethene).

• Polymerisation.
• (b) Tetrafluoroethene

Q5. The structure of part of a polyacrylonitrile
molecule is shown below.

• Draw the structural formula for the monomer used
  to make polyacrylonitrile.
• (b) Name the toxic gas produced when
  polyacrylonitrile burns.

Standard Grade Chemistry
5
Q6. Propene has the structural formula shown
below.          Propene quickly decolourises
bromine water, Br2(aq).  (a) (i) Name the type
of chemical reaction which takes place when
propene reacts with bromine
water. (ii) Draw the full structural
formula for the product of the reaction. (b)
Propene can be converted into the polymer,
poly(propene). Complete the diagram to
show how three propene molecules join to form
part of the polymer chain.
Standard Grade Chemistry
6
Unit 13 Revision.
Q. 7 Ethene is a starting material in the
manufacture of the polymer poly(vinylchloride),
PVC. (a) Name the process used to
make ethene from hydrocarbons obtained from crude
oil. (b) Part of a PVC polymer
molecule is shown below. H H H H H
H -C - C - C - C - C - C - Cl H Cl H
Cl H (i) Draw the structure
of the repeating unit in a PVC molecule.
(ii) Name a toxic gas produced when PVC
burns.
Standard Grade Chemistry
7
Unit 13 Revision.
Q8. When superglue sets a polymer is formed. The
polymer has the following structure. H
COOCH3 H
COOCH3 H COOCH3 C
C C
C C C
H CN
CN CN CN
CN (a) Draw the structural formula
for the monomer in superglue. (b)Name
two toxic gases given off when superglue burns.
Standard Grade Chemistry