PhysicsandMathsTutor.com 1 1. Propene ALLOW prop-1-ene DO NOT ALLOW prop-2-ene [1] 2. (i) —CH 2 CHCl— + 2½O 2 → 2CO 2 + H 2 O + HCl 1 (ii) Alkali OR base OR carbonate ALLOW correct formula of or named carbonate OR alkali OR base Correct name and wrong formula does not score 1 [2] 3. Any two marks from the following: Develop photodegradable polymers Develop biodegradable polymers OR develop compostable polymers Develop techniques for cracking polymers OR develop use as a chemical feedstock Develop ways of making polymers from plant-based substances OR reduce the need to use finite raw materials such as crude oil Designing processes with high atom economy OR reduce waste products during manufacture Develop ways of sorting AND recycling polymers [2]
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PhysicsandMathsTutor.com 1
1. Propene
ALLOW prop-1-ene
DO NOT ALLOW prop-2-ene [1]
2. (i) —CH2CHCl— + 2½O2 → 2CO2 + H2O + HCl1
(ii) Alkali OR base OR carbonate
ALLOW correct formula of or named carbonate
OR alkali OR base
Correct name and wrong formula does not score 1
[2]
3. Any two marks from the following:
Develop photodegradable polymers
Develop biodegradable polymers
OR develop compostable polymers
Develop techniques for cracking polymers
OR develop use as a chemical feedstock
Develop ways of making polymers from plant-based substances
OR reduce the need to use finite raw materials such as crude oil
Designing processes with high atom economy
OR reduce waste products during manufacture
Develop ways of sorting AND recycling polymers[2]
PhysicsandMathsTutor.com 2
4.
H
H H
H C C C3
H
CH3
H
Br H
H C C C3
H
CH3
H
H Br
H C C C3
H
CH3
H
Br Br
H C C C3
H
CH3H
H
CC
CH3
CH3
HBr
Br2H
2
+
one mark for each correct structure
ALLOW skeletal formula OR displayed formulae
IGNORE molecular formulae
IF two answers given e.g. name and structure then both must be
correct to be given a mark
ALLOW methylpropane OR (CH3)3CH
ALLOW 1, 2-dibromo-methylpropane OR
CH2BrCBr(CH3)2
ALLOW 1-bromo-methylpropane OR CH2 Br CH (CH3)2
ALLOW 2-bromo-methylpropane OR CH3 CBr (CH3)2
ALLOW ecf if wrong carbon skeleton is used in all of the
structures mark first structure wrong and then apply ecf for the
rest
[4]
PhysicsandMathsTutor.com 3
5. curly arrow from double bond to Brδ+
and curly arrow from Br—
Br bond pair to Brδ–
in 1st step
curly arrow in 2nd step from bromide ion
correct dipole shown on Br2
correct carbocation shown
H H
H
C C C C
CH3
CH3
CH3
CH3
H
Br
Br
Br
Br
Curly arrow must start from the double bond and not a carbon
atom, other curly arrow must start from Br—Br bond
ALLOW curly arrow from any part of bromide ion
The bromide ion does not need to show a lone pair
Dipole must be partial charge and not full charge
Carbocation needs a full charge and not a partial charge
(charges do not need to be surrounded by a circle)
ALLOW carbocation on carbon 1 where electrophile
attacks carbon 2 i.e. +CH2CBr(CH3)2
[4]
6. (i)
H
C
H F
H
H
H H
C C C
FFree bonds at bond ends must be present
ALLOW minor slip e.g. missing one hydrogen and left as a
stick
ALLOW more than two repeat units but must be a whole
number of repeat units
IGNORE brackets, use of numbers and n in the drawn structure
1
PhysicsandMathsTutor.com 4
(ii)
H
C
F
H
H
C
ALLOW skeletal formula
ALLOW CH2CHF
1
[2]
7. Any two from:
separation into types and recycling OR sort plastics, melt and
remould
combustion for energy generation
used for cracking OR feedstock for plastics or chemicals