Transcript PPT C1 1 .6.1& 2

C1.6.1 Vegetable Oils
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outcomes using questions from past AQA GCSE examinations
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Foundation Tier C1 June 12, 5
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Mark Scheme - Foundation
Q
Answer
(a)(i)
Olive oil does not dissolve in water
(a)(ii)
(the mustard is) an emulsifier
(b)(i)
Double
1
(b)(ii)
Add bromine water- turns colourless
1
(c)(i)
Because the (olive)
trees/plants/crops/leaves/fruit
absorb/use carbon dioxide
Allow carbon for carbon dioxide
Allow carbon dioxide is used in
photosynthesis
1
(c)(ii)
Any one from
•Olive oil is a food
•Olives are slow growing
•Olives require a lot of land
•Not enough olive trees/oil
•Olive oil dense/viscous/high boiling
point
Ignore habitats
Ignore gives off carbon dioxide
1
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Extra Information
Mark
1
Accept an emulsion has been formed
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1
Higher C1 June 12, 6
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Mark Scheme - Higher
Q
Answer
Extra Information
Mark
(a)(i
)
Olive oil does not dissolve in water
Accept olive oil and water are
immiscible
Allow there is no emulsifier
Ignore mustard
Ignore do not mix/different densities
1
(a)(i
i)
(the mustard is) an emulsifier or an
emulsion forms or a suspension of oil in
vinegar/.water forms or visa versa
The molecules have a ‘head’/hydrophilic
end which dissolves in/attracted to oil
accept because an emulsifier is
added
1
Accept diagram drawn showing this
1
1
(b)
Test Add bromine water
Result turns colourless
Allow iodine (solution)
Allow orange colour
disappears/decolourises
Ignore clear
1
1
(c)
(olive oil is reacted with) hydrogen using a
nickel catalyst (at a temperature of about
60oC
Accept hydrogenated
Allow 50-120oC
Ignore hot/heat
1
1
1
Total
9
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