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This video starts by reviewing the structure of common carboxylic acids and alcohols then introduces dicarboxylic acids and diols. Examples are shown of how diacarboxylic acids and diols can form polyesters. The video finishes with a brief outline of the common uses of polyesters and also some of the drawbacks in using polyesters. More more help and information on condensation polymers visit: https://www.science-revision.co.uk/po... More information and help on addition polymerisation visit: https://www.science-revision.co.uk/po...

This video is aimed at gcse chemistry students (triple science), it introduces fuel cells and explains how a hydrogen-oxygen fuel cell works. The video also gives some common ues for fuel cells and compares their use as a source of electrical energy with batteries. For more information on fuel cells visit: https://www.science-revision.co.uk/fuel_cells.html For general help with gcse chemistry visit: https://www.science-revision.co.uk/index.html