I have heard that the Pearson AS Chemistry textbook has a number of errors that seem to have escaped the QA process. They are aware of some specific issues and are planning a free reprint for those already using it. However, if you have noticed any errors, please can you let them (Pearson) know via their custoimer services department. We know the periodic table has errors and some electron structures are wrong. No prizes for finding them but hopefully new books on the way!