Topics 4 & 14

IB Chemistry: Topics 4 & 14

1. Representation of Lewis structuresSome years ago I was moderating assistant examiners as part of my role as Principal Examiner for Paper 2. I was surprised to find that an examiner based in the UK was marking correct Lewis structures wrong. The reason was not difficult to see. The answers had been written by a student from the European mainland where the accepted convention for depicting a pair of electrons is to...

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