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Topics: Oxygen, Oxide, Chromatography Pages: 12 (1700 words) Published: April 19, 2013
Centre Number Surname Other Names Candidate Signature

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General Certificate of Secondary Education Higher Tier June 2012

1 2 3 4 5 6 7 TOTAL

Additional Science
Unit Chemistry C2

CH2HP

Chemistry

Unit Chemistry C2 Thursday 24 May 2012 9.00 am to 10.00 am

H

For this paper you must have:  a ruler  the Chemistry Data Sheet (enclosed). You may use a calculator.

Time allowed  1 hour Instructions  Use black ink or black ball-point pen.  Fill in the boxes at the top of this page.  Answer all questions.  You must answer the questions in the spaces provided. Do not write outside the box around each page or on blank pages.  Do all rough work in this book. Cross through any work you do not want to be marked. Information The marks for questions are shown in brackets.  The maximum mark for this paper is 60.  You are expected to use a calculator where appropriate.  You are reminded of the need for good English and clear presentation in your answers.  Question 2(a) should be answered in continuous prose. In this question you will be marked on your ability to: – use good English – organise information clearly – use specialist vocabulary where appropriate. 



Advice In all calculations, show clearly how you work out your answer.

(Jun12CH2HP01)

G/J84031

6/6/6/6

CH2HP

2 Answer all questions in the spaces provided.

Do not write outside the box

1

Icing on cakes is tested to check that safe colours were used when they were made.

Paper chromatography is one method of testing which colours are in cake icing. 1 (a) The diagram shows an experiment a student did. Lid

Container

Chromatography paper

Start line

Solvent Colouring from cake icing Safe food colours 1 (a) (i) Suggest why there is a lid on the container. ............................................................................................................................................ ............................................................................................................................................ (1 mark) 1 (a) (ii) The start line should be drawn in pencil not in ink. Suggest why. ............................................................................................................................................ ............................................................................................................................................ (1 mark)

(02)

G/J84031/Jun12/CH2HP

3 1 (b) The diagram shows the results of the paper chromatography experiment.

Do not write outside the box

Safe food colours

Colouring from cake icing

1 (b) (i)

How many different food colours were used in the colouring from the cake icing? ............................................ (1 mark)

1 (b) (ii) Is the cake icing safe to eat? Give a reason for your answer. ............................................................................................................................................ ............................................................................................................................................ (1 mark)

Question 1 continues on the next page

Turn over 

(03)

G/J84031/Jun12/CH2HP

4 1 (c) 1 (c) (i) Gas chromatography linked to mass spectroscopy is an example of an instrumental method. This method was used on a mixture of solvents. Give two advantages of gas chromatography compared with paper chromatography. ............................................................................................................................................ ...............................................................................................................................................
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