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5038 w06 ir 3 .pdf

Original filename: 5038_w06_ir_3.pdf
Title: Microsoft Word - LIBS_TASK SCORD 11_5038_03CI 2006.doc
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General Certificate of Education Ordinary Level



Paper 3 Practical Test
October/November 2006

1 hour 15 minutes

Great care should be taken to ensure that any confidential information given
does not reach the candidates either directly or indirectly.
These instructions give details of the apparatus reagents and specimens required by each candidate for
each experiment in this paper. A summary of the questions that will be presented to candidates is
included, where appropriate, to allow the teacher to test the apparatus appropriately. No access to the
question paper is permitted in advance of the examination.
It is assumed that the ordinary apparatus of a science laboratory will be available, including a supply of
purified water (distilled or deionised).
If arrangements are made for different sessions for different groups of candidates, care must be taken to
ensure that the different groups of candidates are effectively isolated so that no information passes
between them.
All specimens should carry only the code letters and numbers as indicated and their identity
should not be revealed to the candidates.
Supervisors should ensure that all specimens have the correct identity attached to the specimen and that
these are not removed during the examination.
Supervisors are advised to remind candidates that all substances in the examination should be treated
with caution. Pipette fillers and safety goggles should be used where necessary.
In accordance with COSHH (Control of Substances Hazardous to Health) Regulations, operative in the
UK, a hazard appraisal of the examination has been carried out.
The following codes are used where relevant
C = corrosive substance

F = highly flammable substance

H = harmful or irritating substance

O = oxidising substance
T = toxic substance

If you have any problems or queries regarding these Instructions, please contact CIE
by e-mail
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 2 printed pages.
IB06 11_5038_03CI/3RP
© UCLES 2006

[Turn over

All specimens/materials should carry only the letters/numbers as indicated and their identity should
not be revealed to candidates.
Supervisors should ensure that all specimens have the correct identity attached to the specimen and
that these are not removed or altered during the examination.
Specimens and apparatus should be provided as follows.
Question 1
Each candidate should have access to:

deionised water labelled AS1 (approx 20 ml/candidate);
a source of 1M hydrochloric acid labelled AS2 (approx 20 ml/candidate. The sample should
turn Universal Indicator orange/red;
a source of 0.01M hydrochloric acid labelled AS3 (approx 20 ml/candidate). The sample
should turn Universal Indicator yellow;
Universal Indicator solution or Universal Indicator paper. Whichever is used should be stated
on the Supervisor’s report;
three clean test tubes;

Question 2

a piece of thin card larger than 100 mm x 160 mm;
300 mm ruler;
200 mm adhesive tape;
a pin;
a retort stand;
a plumb line of between 150 mm and 250 mm, labelled plumb line.

Question 3

a mixture of albumin (or any other soluble protein) and starch in a ratio of 1:10 labelled AS4.
Each Candidate will require approx. 3 spatulae of the mixture;
iodine solution labelled iodine solution (approx 1 ml/candidate);
Benedict’s solution labelled Benedict’s solution (approx 5 ml/candidate);
1M sodium hydroxide solution labelled sodium hydroxide (approx 5 ml/candidate);
1M copper sulphate solution labelled copper sulphate (approx 5 ml/candidate);
three clean test tubes;
a source of heat for warming the test tubes.

The supervisor’s report is to be filled in on the back page of the first candidates’s script. Please
ensure that this is done.

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

© UCLES 2006


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