From diamonds to dynamite everything involves a chemical reaction. This unit introduces you to the concepts and principles that underpin chemistry at the molecular level. Everyday experiences are used to help you to understand the more complex issues. This study unit is just one of many that can be found on LearningSpace, part of OpenLearn, a collection of open educational resources from The Open University. Published in ePub 2.0.1 format, some feature such as audio, video and linked PDF are not supported by all ePub readers.