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Click “Continue” to agree to Save My Exams’ and acknowledge that Save My Exams’ applies to you. 4 Separation & Purification. 2 Advanced Inorganic & Organic Chemistry Core Practicals. Revision notes on 4. A ligand is a molecule or ion that forms a co-ordinate bond with a transition metal by donating a pair of electrons to the bond. Revision notes for the Edexcel GCSE Chemistry syllabus, written by the Chemistry experts at Save My Exams. Dehydration is done by heating the alcohol with concentrated phosphoric acid. Revision notes for the Edexcel International AS Chemistry syllabus, written by the Chemistry experts at Save My Exams. H2O2 (aq) + 2I- (aq) + 2H+(aq) → I2 (aq) + 2H2O (l) 7. Some examples of percentage uncertainty An ion is an electrically charged atom or group of atoms formed by the loss or gain of electrons. 0. In other words, it is a measure of how disordered a system is. Analysis (A Level Only) 8. The methyl, CH 3+, fragment has a mass of 15. GCSE Past Papers. 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