Mark Scheme (Results) June 2014 - Edexcel

Mark Scheme (Results)

June 2014

Pearson Edexcel Certificate

Chemistry (KCH0) Paper 2C

Pearson Edexcel International GCSE

Chemistry (4CH0) Paper 2C

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June 2014

Publications Code UG038305

All the material in this publication is copyright

? Pearson Education Ltd 2014

General Marking Guidance

? All candidates must receive the same treatment. Examiners must

mark the first candidate in exactly the same way as they mark

the last.

? Mark schemes should be applied positively. Candidates must be

rewarded for what they have shown they can do rather than

penalised for omissions.

? Examiners should mark according to the mark scheme not according

to their perception of where the grade boundaries may lie.

? There is no ceiling on achievement. All marks on the mark scheme

should be used appropriately.

? All the marks on the mark scheme are designed to be awarded.

Examiners should always award full marks if deserved, i.e. if

the answer matches the mark scheme. Examiners should also

be prepared to award zero marks if the candidate¡¯s response is

not worthy of credit according to the mark scheme.

? Where some judgement is required, mark schemes will provide the

principles by which marks will be awarded and exemplification

may be limited.

? When examiners are in doubt regarding the application of the

mark scheme to a candidate¡¯s response, the team leader must

be consulted.

? Crossed out work should be marked UNLESS the candidate has

replaced it with an alternative response.

Question

number

1

a

b

i

Answer

B

Notes

(2)

FR AND FG

FR and FG/they/colourings/dyes/spots/OWTTE

AND

line up/match/correspond with/travel same

distance(s) as / have same Rf values as

AND

SR and SG/safe colourings/red and green

colourings

Marks

1

Choice can be indicated by ticks or

other marks or Yes

M2 DEP on M1 correct or missing

Ignore references to FB unless incorrect

1

1

Ignore references to FR and FG

containing/being the same as SR and

SG

(Total for Question 1 = 3 marks)

Question

number

2

Answer

Notes

Marks

a

fractional distillation / fractionation

Ignore just distillation

Reject simple distillation

1

b

(they have) different boiling points/boiling

temperatures / boil at different temperatures

OR

ethanol has a lower boiling point (than water)

/water has a higher boiling point (than

ethanol))

Ignore references to melting point

Ignore references to condensing

Accept one boils at 78(?C), the other at

100(?C)

Accept ethanol boils/evaporates first

Ignore boils/evaporates faster

1

c

to keep the jacket full of water

/to make sure there is no air in the jacket

/to surround the whole tube

OR

(for B) not enough water in the condenser

/ water not in contact with tube for long

enough

/water runs straight out

Accept tube/condenser in place of jacket

Accept reverse arguments relating to B

Ignore references to rate of cooling or

condensing

Ignore so that more ethanol /vapour/gas

condenses / to make sure all the

ethanol/vapour/gas condenses

Ignore references to glass breaking

1

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