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C1.5.3 Ethanol

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, 6

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Mark scheme- Foundation

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Q Answer Extra Information Mark (a) 6

oxygen11

(b) (i) Heating the hydrocarbon to a high temperatureThe presence of a catalyst

11

(b) (ii) All bonds correctFour C-H bonds and one C=C bond

1

(b)(iii) Water Accept hydrogen oxide/steamAllow H2O

1

( c)(i) Carbon dioxide Allow CO2 1

( c) (ii) By filtering/decanting/centrifuging ( to remove the yeast)(fractional) distillation (to separate ethanol from water)

Ignore sievingAccept a description of (fractional) distillation

1

1

Total 9

HigherC1 June 12, 7

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Mark scheme- Higher

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Q Answer Extra Information Mark (a) C2H4

A correct other answer and balanced

eg C4H10

11

(b) Bubbling/fizzing/frothing/effervescence

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

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