Plant Oils And Their Uses Worksheet With Answers - George Pindar School Page 31
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36Z the water can be run off / tapped off leaving the oil(s)
allow oil floats on water or they form two layers
1
(b)
(i)
incorrect reagent = 0 marks
add bromine water
1
(bromine water) is decolourised / goes colourless
ignore clear
if colour of bromine water given it must be yellow, orange,
red or brown
1
(ii)
any one from:
• to harden the oil
• to change the oil into a solid
• to make the oil into a spread
• to increase its melting point
ignore boiling point
1
(iii)
incorrect process = max 2
(olive oil is) reacted with hydrogen
accept hydrogenated
1
using a nickel catalyst
1
at a temperature of about 60 °C
allow 50°C to 160°C
if last two points not given allow ‘heat with a catalyst’ for 1 mark
1
[10]
M12.
(a)
(i)
in the presence of a nickel catalyst
1
at about 60 °C
allow 50 – 150 °C
1
(ii)
(no) because hydrogen adds to the unsaturated fat or (no) because hydrogen
reduces the number of (carbon–carbon) double bonds
accept (no) because hydrogen increases number of (carbon-
carbon) single bonds
1
Page 31 of 36
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