A knowledge organiser on the A-Level Chemistry Topic 4: Groups 2 and 7 Chemistry. Including the chemistry and equations they need to know (reactions of group 2 with oxygen, water, acid etc, thermal decomposition of the group 1 & 2 carbonates/nitrates, halogen chemistry including trends, disproportion reactions in hot & cold alkali, reducing agents with reactions of sulfuric acid, oxidising agents (displacement reactions) etc. Also includes information on the qualitative tests of halides, sulfates, carbonates and also flame testing of cations and identification of the ammonium ion. A comprehensive revision organiser that the students can use to make their revision notes from. Relevant for the new 2015 A-Level Edexcel syllabus.