Download Syllabus Cambridge International A & AS Level Chemistry Syllabus code 9701

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5. Practical assessment
Expectations for each mark category (Paper 31/32)
Manipulation, measurement and observation
Successful collection of data and observations
Candidates should be able to:
•
set up apparatus correctly
•
follow instructions given in the form of written instructions or diagrams
•
use their apparatus to collect an appropriate quantity of data or observations, including subtle
differences in colour, solubility or quantity of materials
•
make measurements using pipettes, burettes, measuring cylinders, thermometers, and other
common laboratory apparatus.
Systematic analysis and a knowledge of traditional methods of separation will not be required. It will be
assumed that candidates will be familiar with
(i) the reactions of the following cations: NH4+, Mg2+, Al 3+, Ca2+, Cr3+, Mn2+, Fe2+, Fe3+, Cu2+, Zn2+, Ba2+,
Pb2+
(ii) the reactions of the following anions: CO32–, NO3–, NO2–, SO42–, SO32–, Cl –, Br–, I –, CrO42–
(iii) tests for the following gases: NH3, CO2, Cl 2, H2, O2, SO2, as detailed in the qualitative analysis
notes which will be included with the question paper and are reproduced at the end of the section.
The substances to be investigated may contain ions not included in the above list: in such cases,
candidates will not be expected to identify the ions but only to draw conclusions of a general nature.
Candidates should not attempt tests, other than those specified, on substances, except when it is
appropriate to test for a gas.
Exercises requiring a knowledge of simple organic reactions e.g. test-tube reactions indicating the
presence of unsaturated, alcoholic and carboxylic groups may also be set, but this would be for the
testing of observation skills and drawing general conclusions only.
A knowledge of the following volumetric determinations will be assumed: acids and alkalis using suitable
indicators; iron(II), ethanedioic acid (and its salts), by potassium manganate(VII); iodine and sodium
thiosulfate. Simple titrations involving other reagents may also be set but, where appropriate, sufficient
working details will be given.
Candidates should normally record burette readings to the nearest 0.05 cm3 and temperature readings to
the nearest 0.5 °C when using a thermometer calibrated in 1 °C intervals, and to the nearest 0.1 °C where
the interval is 0.2 °C.
Cambridge International A & AS Level Chemistry 9701. Examination in June and November 2012.
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