|About the Book|
The vision to write a book that will support students studying chemistry at the AS level, came to the author while teaching the Cambridge International A & AS Level Chemistry Syllabus for 13 years. The very first topic in the syllabus is calledMoreThe vision to write a book that will support students studying chemistry at the AS level, came to the author while teaching the Cambridge International A & AS Level Chemistry Syllabus for 13 years. The very first topic in the syllabus is called Atoms, molecules and stoichiometry. The academic year does not allow teachers to spend much time on this topic, with the result that many students with various academic backgrounds are obliged to proceed with topic two without having mastered topic one of the syllabus. The book is therefore written in a Teach Yourself format to help students master this important topic needed for writing examinations on theory as well as advanced practical skills papers.A study of stoichiometry (quantitative chemical relationships) in chemical reactions requires that the student should become very attentive to units of measurement and significant figures reported in calculations. These topics are treated in Chapter 1. Sloppiness in this respect will result in lost marks come examination time.The author is convinced that before a student could sensibly proceed with a study of stoichiometry, that he/she must have a solid foundation in the topics presented in Chapter 2. The quantitative relationships given by a chemical formula or a balanced chemical equation and stoichiometric coefficients are explained. The components of atoms, the Periodic Table and ionic compounds and the naming of inorganic compounds are revisited.In Chapter 3 the student will be introduced to the mole, which is the S.I unit for counting things. The importance of using a balanced chemical equation in doing stoichiometric calculations is stressed. The balancing of inorganic and combustion reactions are therefore important topics studied in this chapter. The importance of a balanced chemical equation is studied through stoichiometric mass calculations, limiting reactions, theoretical yield and percentage yield of chemical reactions. The mathematical approach to all calculations done in this book is based on dimensional analysis. The concept of equivalencies and conversion factors derived from equivalencies as explained in Chapter 2 is stressed throughout the book. Conversion factors are used to convert measurements having laboratory S.I. units such as gram substance to mole substance. Dimensional analysis is a very powerful calculation method used in stoichiometry and the method is extensively used in calculations regarding the making up of solutions, reactions in solution and acid-base reactions. The chapter is concluded with a discussion of chemical reactions in the gas phase and redox reactions.