This book examines the effect of using molecular models on students' understanding of structure and chemical bonding in selected high schools in Kenya.The study is a published thesis submitted in partial fulfilment of the requirements for the award of the degree of Master of Science in Science education of Masinde Muliro University of Science nd technology, Kenya.In a nutshell, the study found that using molecular models in classroom instruction significantly promoted students' understanding of structure and bonding, an otherwise abstract topic in chemistry. The study recommended integration of novel information technology approaches- particularly computer-based ones- in classroom instruction. Further, science teachers are encouraged to carefully consider, select and use instructional approaches that cna be described as "non-traditional". It is hoped that readers will find this book thought-provoking and that it will prompt a review of approaches to teaching other abstract topicsin chemistry.