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The Supervisor’s attention is drawn to the form on page 7 which must be completed and returned with

the scripts.

If you have any problems or queries regarding these Instructions, please contact CIE

by e-mail: [email protected],

by phone: +44 1223 553554,

by fax +44 1223 553558,

stating the Centre number, the nature of the query and the syllabus number quoted above.

This document consists of 8 pr inted pages.

[Turn over IB14 11_9701_33CI/4RP

© UCLES 2014

* 6 1 0 3 9 8

4 4 8 3 *

CHEMISTRY 9701/33

Paper 3 Advanced Practical Skills 1 October/November 2014

CONFIDENTIAL INSTRUCTIONS

Great care should be taken to ensure that any confidential information given does not reach the

candidates either directly or indirectly.

Cambridge International Examinations

Cambridge International Advanced Subsidiary and Advanced Level

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Safety

Supervisors are advised to remind candidates that all substances in the examination should be treatedwith caution.

Only those tests described in the question paper should be attempted. Please also see under ‘Apparatus’on the use of pipette fillers, safety goggles and plastic gloves.

In accordance with COSHH (Control of Substances Hazardous to Health) Regulations, operative in theUK, a hazard appraisal of the examination has been carried out.

Attention is drawn in particular, to certain materials used in the examination. The following codes areused where relevant.

C corrosive substance F highly flammable substance H harmful or irritating substance O oxidising substance T toxic substance N dangerous for the environment

The attention of Supervisors is drawn to any local regulations relating to safety and first-aid.

‘Hazard Data Sheets’, relating to materials used in this examination, should be available from yourchemical supplier.

Before the Examination

1 Access to the question paper is NOT permitted in advance of the examination.

2 Preparation of materials

Where quantities are specified for each candidate, they are suf ficient for the experiments describedin the question paper to be completed.

In preparing materials, the bulk quantity for each substance should be increased by 25% as spare material should be available to cover accidental loss. More material may be supplied ifrequested by candidates, without penalty.

All solutions should be bulked and mixed thoroughly before use to ensure uniformity.

Every effort should be made to keep the concentrations accurate to within one part in two hundredof those specified.

Supervisors are asked to carry out any confirmatory tests given on page 4 to ensure thematerials supplied are appropriate.

If the concentrations differ slightly from those specified, the Examiners will make the necessaryallowance. They should be informed of the exact concentrations.

3 Labelling of materials

Materials must be labelled as specified in these instructions. Materials with an FA code numbershould be so labelled without the identities being included on the label. Where appropriate theidentity of an FA coded chemical is given in the question paper itself.

4 Identity of materials

It should be noted that descriptions of solutions given in the question paper may not correspondexactly with the specifications in these Instructions. The candidates must assume thedescriptions given in the question paper.

5 Size of group

In view of the dif ficulty of the preparation of large quantities of solution of uniform concentration,it is recommended that the maximum number of candidates per group be 30 and that separatesupplies of solutions be prepared for each group.

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Apparatus

1 In addition to the fittings ordinarily contained in a chemical laboratory, the apparatus and materials

specified below will be necessary.

2 Pipette fillers (or equivalent safety devices), safety goggles and disposable gloves should be used

where necessary.

3 For each candidate

1 × 250 cm3 beaker

1 × 100 cm3 beaker, labelled waste

1 × foamed plastic (polystyrene) cup

1 × 25 cm3 measuring cylinder

1 × thermometer (–10 °C to +110 °C, at 1 °C)

1 × stop watch (sight of clock reading to 1 second)

1 × glass rod

1×

Bunsen burner 1 × heat proof mat

1 × test-tube holder

6 × test-tubes*

1 × hard-glass test-tube

3 × boiling tubes*

1 × test-tube rack

1 × spatula

1 × tripod and gauze

2 × teat/dropping pipettes

1 × wash bottle containing distilled water

paper towels

access to a balance weighing to at least 0.1 g

*Candidates are expected to rinse and re-use test-tubes and boiling tubes where possible.

Additional tubes should be available.

Where access to a balance is limited, candidates should be directed to start the practical

examination on different questions. (See p56 of the 2014 Syllabus for balance : candidate ratio.)

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C h e m i c a l s R e q u i r e d

1

I t i s

e s p e c i a l l y i m p o r t a n t t h a t g r e

a t c a r e i s t a k e n t h a t t h e c o n fi d

e n t i a l i n f o r m a t i o n g i v e n b e l o w

d o e s n o t r e a c h t h e c a n d i d a t e s

e i t h e r d i r e c t l y o r

i n d i r e c t l y .

2

P a r t i c u l a r r e q u i r e m e n t s

h a z a r d

l a b e l

p e r

c a n d i d

a t e

i d e n t i t y

n o t e s

( h a z a r d s g i v e n i n t h i s c o l u m n a r e f o r t h e r a w m

a t e r i a l s )

[ H ]

F A 1

4 0 c m

3

1 . 0 m o l d m – 3 s u l f u r i c a c i d

S e e p r e p a r a t i o n i n s t r u c t i o n s o n p a g e 5 9 o f t h e 2 0 1 4 s y l l a b u s .

[ F ]

F A 2

0 . 2 0

g

m a g n e s i u m p o w d e r

0 . 2 0 ± 0 . 0 2 g m a g n e s i u m

p o w d e r [ F ] p e r c a n d i d a t e i n a s t o p p e r e d

t u b e .

N o t e : F A 4 a n d F A 5 a r e a l s o 0 . 2 0 ± 0 . 0 2 g m a g n e s i u m

p o w d e r p e r

c a n d i d a t e .

[ H ]

F A 3

7 0 c m

3

1 . 0 m o l d m – 3 c o p p e r ( I I ) s u l f a t e

D i s s o l v e 2 4 9 . 6 g o f C u S

O 4 . 5 H 2 O [ H

] [ N ] i n e a c h d m 3 o

f s o l u t i o n .

[ F ]

F A 4

0 . 2 0

g


0 . 2 0 ± 0 . 0 2 g m a g n e s i u m


t u b e .

[ F ]

F A 5

0 . 2 0

g


0 . 2 0 ± 0 . 0 2 g m a g n e s i u m


t u b e .

[ O ] [ H ]

F A 6

1 g

s o d i u m n

i t r a t e

A p p r o x i m a t e l y 1 g o f N a

N O 3

[ O ] [ H ] s h o u l d b e p r o v i d e d

f o r e a c h

c a n d i d a t e .

[ H ] [ N ]

F A 7

1 0 c m

3

0 . 0 5 m o l d m – 3 s

i l v e r n i t r a t e

S e e i d e n t i t y d e t a i l s a n d

p r e p a r a t i o n i n s t r u c t i o n s o n p a g e 5 9 o f t h e

2 0 1 4 s y l l a b u s .

S h o u l d b e p r o v i d e d i n a

t e s t - t u b e f o r e a c h c a n d i d a t e a

n d k e p t o u t t h e

l i g h t u n t i l 1 h o u r b e f o r e

t h e e x a m i n a t i o n .

F A 8

1 g

z i n c c a r b o n a t e o r b a s i c z

i n c

c a r b o n a t e

A p p r o x i m a t e l y 1 g o f Z n

C O 3

o r Z n C O 3 . Z n ( O H ) 2 s h o u l d

b e p r o v i d e d

f o r e a c h c a n d i d a t e . A n y

b a s i c z i n c c a r b o n a t e c o n t a i n i n

g Z n C O 3

i s

s u i t a b l e .

g l u c o s e

1 g

g l u c o s e

A p p r o x i m a t e l y 1 g o f g l u

c o s e s h o u l d b e p r o v i d e d f o r e a c h c a n d i d a t e .

S o m e s u p p l i e r s w i l l r e f e

r t o t h i s a s D - G l u c o s e o r D e x t r o s e .

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3

T h e

r e a g e n t s b e l o w

s h o u l d a l s o b e p r o v i d e d . U n l e s s o t h e r w i s e

s t a t e d , e a c h c a n d i d a t e s h o u l d r e q u i r e n o m o r e t h a n 1 0 c m

3 o

f a n y o f t h e s e

r e a g e n t s . I f n e c e s s a r y , t h e y m a y b

e m a d e a v a i l a b l e f r o m a c o m m

u n a l s u p p l y : h o w e v e r , t h e a t t e n t i o n o f t h e I n v i g i l a t o r s s h o u l d

b e d r a w n t o t h e

f a c t

t h a t s u c h a n a r r a n g e m e n t m a y l e a d t o c o n t a m i n a t i o n o f r e a g e n t s a n d e n h a n c e t h e o p p o r t u n

i t y f o r m a l p r a c t i c e b e t w e e n c a

n d i d a t e s .

h a z a r d

l a b e l

p e r c a n d i d a t e

i d e n t i t y

n o t e s

[ H ]

d i l u t e h y d r o c h l o r i c a c i d

S e e

i d e n t i t y d e t a i l s a n d p r e p a r a t i o n

i n s t r u c t i o n s o n p a g e s 5 9 a n d 6 0 o f t h e 2 0 1 4

s y l l a b u s .

[ C ]

d i l u t e n i t r i c a c i d

[ H ]

d i l u t e s u l f u r i c a c i d

[ H ]

a q u e o u s a m m o n i a

2 5 c m 3

[ C ]

a q u e o u s s o d i u m h

y d r o x i d e

2 5 c m 3

[ H ]

0 . 1 m o l d m –

3 b

a r i u m c

h l o r i d e

o r

0 . 1 m o l d m –

3 b

a r i u m n

i t r a

t e

[ H ] [ N ]

0 . 0

5 m o l d m –

3 s

i l v e r n i t r a t e

[ H ]

l i m e w a t e r

0 . 1 m o l d m –

3 p

o t a s s i u m i o d

i d e

[ H ] [ N ]

a c i d i fi e d a q u e o u s p o t a s s i

u m

m a n g a n a t e ( V I I )

M i x e q u a l v o l u m e s o f 0 . 0 2 m o l d m – 3 K

M n O 4

[ N ] a n d 1 . 0

m o l d m – 3 s u l f u r i c a c i d [ H ] .

4

T h e

f o l l o w i n g m a t e r i a l s a n d a p p a r a t u s s h o u l d b e a v a i l a b l e .

r e d a n d

b l u e l i t m u s p a p e r s , p l a i n fi l t e r

p a p e r s t r i p s f o r u s e w i t h a c i d i fi

e d m a n g a n a t e ( V I I ) , a l u m i n i u m

f o i l f o r t e s t i n g n i t r a t e / n i t r i t e , w

o o d e n s p l i n t s

a n d t h e

a p p a r a t u s n o r m a l l y u s e d i n t h

e C e n t r e f o r u s e w i t h l i m e w a t e r i n t e s t i n g f o r c a r b o n d i o x i d e

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Responsibilities of the Supervisor during the Examination

1 The Supervisor, or other competent chemist, must, out of sight of the candidates, carry out the

experiments in Question 1 and complete tables of readings on a spare copy of the question paper

which should be labelled ‘Supervisor’s Results’.

This should be done for:

each session held and each laboratory used in that session, and each set of solutions

supplied.

N.B. The question paper cover requests the candidate to fill in details of the examination

session and the laboratory used for the examination.

It is essential that each packet of scripts contains a copy of the applicable Supervisor’s

Results as the candidates’ work cannot be assessed accurately without such information.

2 The Supervisor must complete the Report Form on page 7 to show which candidates attended

each session. If all candidates took the examination in one session, please indicate this on the

Report Form. A copy of the Report Form must accompany each copy of the Supervisor’s Results

in order for the candidates’ work to be assessed accurately.

The Supervisor must give details on page 8 of any particular dif ficulties experienced by a candidate,

especially if the Examiner would be unable to discover this from the written answers.

After the Examination

Each envelope returned to Cambridge must contain the following items.

1 The scripts of those candidates specified on the bar code label provided.

2 A copy of the Supervisor’s Report relevant to the candidates in 1.

3 A copy of the Report Form, including details of any dif ficulties experienced by candidates (see

pages 7 and 8).

4 The Attendance Register.

5 A Seating Plan for each session/laboratory.

Failure to provide appropriate documentation in each envelope may cause candidates to be

penalised.

COLOUR-BLINDNESS

With regard to colour-blindness it is permissible to advise candidates who request assistance on

colours of, for example precipitates and solutions (especially titration end-points). Please include with

the scripts a note of the candidate numbers of such candidates.

Experience suggests that candidates who are red/green colour-blind – the most common form – do

not generally have significant dif

ficulty. Reporting such cases with the scripts removes the need for a‘Special Consideration’ application.

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9701/33

REPORT FORM

This form must be completed and sent to the Examiner in the envelope with the scripts.

Centre Number ..................................................... Name of Centre ......................................................

1 Supervisor’s Results

Please submit details of the readings obtained in Question 1 on a spare copy of the question

paper clearly marked ‘Supervisor’s Results’ and showing the Centre number and appropriate

session/laboratory number.

2 The candidate numbers of candidates attending each session were:

First Session Second Session

3 The Supervisor is required to give details overleaf of any dif ficulties experienced by particular

candidates, giving names and candidate numbers. These should include reference to:

(a) any general dif ficulties encountered in making preparation;

(b) dif ficulties due to faulty apparatus or materials;

(c) accidents to apparatus or materials;

(d) assistance with respect to colour-blindness.

Other cases of hardship, e.g. illness, temporary disability, should be reported direct to CIE on the

normal ‘Application for Special Consideration’ form.

4 A plan of work benches, giving details by candidate numbers of the places occupied by the

candidates for each experiment for each session, must be enclosed with the scripts.

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Report on any dif ficulties experienced by candidates.

Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every

reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included the

publisher will be pleased to make amends at the earliest possible opportunity.

Cambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University of Cambridge Local

Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge.

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