Note:
IGCSE Chemistry Notes on The Experimental Techniques
- Cambridge IGCSE Chemistry Revision Notes prepared by Cambridge trained staff with rich experience.
Syllabus Objectives:
2.1 Measurement
CORE:
- Name appropriate apparatus for the
measurement of time, temperature, mass
and volume, including burettes, pipettes and
measuring cylinders
2.2 Purity
2.2.1 Criteria of purity
Core
- Demonstrate knowledge and understanding of
paper chromatography
- Interpret simple chromatograms
- Identify substances and assess their purity from
melting point and boiling point information
- Understand the importance of purity in
substances in everyday life, e.g. foodstuffs and
drugs
Supplement
- Interpret simple chromatograms, including the
use of Rf
values
- Outline how chromatography techniques can
be applied to colourless substances by exposing
chromatograms to substances called locating
agents. (Knowledge of specific locating agents is
not required.)
2.2.2 Methods of purification
Core
- Describe and explain methods of purification
by the use of a suitable solvent, filtration,
crystallization and distillation (including use of
a fractionating column). (Refer to the fractional
distillation of petroleum in section 14.2 and
products of fermentation in section 14.6.)
- Suggest suitable purification techniques, given
information about the substances involved