version 2.0 copyright © aqa and its licensors. all rights reserved. c1.6.1 vegetable oils
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Version 2.0 Copyright © AQA and its licensors. All rights reserved.
C1.6.1 Vegetable Oils
Using Exam pro items to support successful outcomes
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• Learners will be able to test their progress against learning outcomes using questions from past AQA GCSE examinations
Foundation Tier C1 June 12, 5
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Mark Scheme - Foundation
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Q Answer Extra Information Mark
(a)(i) Olive oil does not dissolve in water 1
(a)(ii) (the mustard is) an emulsifier Accept an emulsion has been formed 1
(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 dioxideAllow 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 habitatsIgnore gives off carbon dioxide
1
Higher C1 June 12, 6
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Copyright © AQA and its licensors. All rights reserved.
Mark Scheme - Higher
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Q Answer Extra Information Mark
(a)(i)
Olive oil does not dissolve in water Accept olive oil and water are immiscibleAllow there is no emulsifier Ignore mustardIgnore do not mix/different densities
1
(a)(ii)
(the mustard is) an emulsifier or an emulsion forms or a suspension of oil in vinegar/.water forms or visa versaThe molecules have a ‘head’/hydrophilic end which dissolves in/attracted to oil
accept because an emulsifier is added
Accept diagram drawn showing this
1
11
(b) Test Add bromine waterResult turns colourless
Allow iodine (solution)Allow orange colour disappears/decolourisesIgnore clear
11
(c) (olive oil is reacted with) hydrogen using a nickel catalyst (at a temperature of about 60oC
Accept hydrogenatedAllow 50-120oCIgnore hot/heat
111
Total 9