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