Plant Oils And Their Uses Worksheet With Answers - George Pindar School Page 6
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36(ii)
The colour of bromine water is orange.
What is seen when bromine water is shaken with:
an unsaturated fat ........................................................................................................
a saturated fat? ............................................................................................................
(2)
(iii)
Unsaturated vegetable oils can be hardened to make them useful as spreads. Describe
how unsaturated vegetable oils are hardened.
.....................................................................................................................................
.....................................................................................................................................
.....................................................................................................................................
.....................................................................................................................................
(2)
(Total 5 marks)
Q5.
Margarine is manufactured using ‘hard’ plant oils. A margarine company tested several plant
oils to determine their hardness for use in its margarine.
In the test iodine solution was used to find the iodine value. The units are grams of iodine that
react with 100 g of oil.
Plant oils with lower iodine values are harder and are less unsaturated.
Plant oil
Melting point in °C
Iodine value
Coconut
25
10
Palm
35
54
Olive
–6
81
Castor
–18
85
Peanut
3
93
Rapeseed
–10
98
Sunflower
–17
125
Soya bean
–16
130
Page 6 of 36
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