Version 2.0 Copyright © AQA and its licensors. All rights reserved. C1.5.3 Ethanol.

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Version 2.0 Copyright © AQA and its licensors. All rights reserved. C1.5.3 Ethanol

Using Exam pro items to support successful outcomes Version 2.0 Copyright © AQA and its licensors. All rights reserved. Learners will be able to test their progress against learning outcomes using questions from past AQA GCSE examinations

Foundation tier C1 June 12, 6 Version 2.0 Copyright © AQA and its licensors. All rights reserved.

Mark scheme- Foundation Version 2.0 Copyright © AQA and its licensors. All rights reserved. QAnswerExtra InformationMark (a) 6 oxygen 1111 (b) (i)Heating the hydrocarbon to a high temperature The presence of a catalyst 1111 (b) (ii)All bonds correct Four C-H bonds and one C=C bond 1 (b)(iii)WaterAccept hydrogen oxide/steam Allow H 2 O 1 ( c)(i)Carbon dioxideAllow CO21 ( c) (ii)By filtering/decanting/centrifuging ( to remove the yeast) (fractional) distillation (to separate ethanol from water) Ignore sieving Accept a description of (fractional) distillation 1111 Total 9

HigherC1 June 12, 7 Version 2.0 Copyright © AQA and its licensors. All rights reserved.

Mark scheme- Higher Version 2.0 Copyright © AQA and its licensors. All rights reserved. QAnswerExtra InformationMark (a) C 2 H 4 A correct other answer and balanced eg C 4 H (b)Bubbling/fizzing/frothing/effervescenc e Ignore gas given off or solution goes cloudy 1 ( c)See next slide for detail 5 Total 8

Mark scheme- Higher c. Any 5 from the following. For full marks there must be advantages and disadvantages and their importance included Advantages Sugar cane/plants absorb carbon dioxide/photosynthesise Sugar cane/plants are renewable/sustainable Low energy process Disadvantages Large areas of land are needed Land could be used for food crops Slow process Ethanol is impure or contains 50% ethanol Batch process The crop yield/supply of ethanol is unreliable A justified conclusion Version 2.0 Copyright © AQA and its licensors. All rights reserved.