Dealing with topics ranging from atomic structures to reactions and an introduction to the mole, Book 1 includes worked examples along with practice problems that focus students on the mechanics of the numbers behind the concepts. The activities are suited to a variety of uses, including both individual and collaborative work. Model answers to most practice problems are also supplied. The essential message of this series is: don’t stress the numbers – they can help rather than hinder students’ understanding of chemistry. When used correctly, the measurements students take during an experiment bridge the gap between what they experiment with and the current consensus on how chemicals work.