AS (Specification 1421) Consists of 3 units. Unit 1 (33.3%) Covers atomic structure, bonding roles calculations, the Periodic Table and some organic chemistry. It is assessed by 1.25 hour exam. Unit 2 (46.6%) Covers energy changes in chemical reatcions, factors affecting rate of reaction reversable reactions, groups 2 & 7 of the Periodic Table. The extraction of metals and more organic chemistry. It assesed by a 1.75 hour written exam. Unit 3 (20%) Is devoted to practical work and includes an investigative skills assignment (ISA) and practical skills assessment (PSA).

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