Plant Oils And Their Uses Worksheet With Answers - George Pindar School Page 34
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36M15.
(a)
(i)
water and oil do not mix / are immiscible
ignore density
1
or
don’t dissolve each other
ignore emulsifier alone
1
(ii)
any two from:
•
emulsifier
•
forms an emulsion
accept description of an emulsion
•
holds the two components together
accept stops them separating / they mix
allow bonds / binds for holds
•
by lowering the surface tension
accept a description of how an emulsifier works for two
marks
eg ‘tadpole’ diagram or dispersal of oil drops
2
(b)
(i)
(because they contain) a double (carbon carbon) bond
accept unsaturated
ignore poly or mono
1
(ii)
results suggest sunflower oil is best
or
‘the one that took the least time’
1
because (sunflower oil) has the highest amount of unsaturation /
most double bonds / least saturated
ignore uses up I
most quickly
2
second mark is dependent on first
1
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