This chapter will describe how to symbolize chemical reactions using chemical equations, how to classify some common chemical reactions by identifying patterns of reactivity, and how to determine the quantitative relations between the amounts of substances involved in chemical reactions—that is, the reaction stoichiometry . 4.1: Writing and Balancing Chemical Equations Chemical equations are symbolic representations of chemical and physical changes. Formulas for the substances undergoing the change (reactants) and substances generated by the change (products) are separated by an arrow and preceded by integer coefficients indicating their relative numbers. Balanced equations are those whose coefficients result in equal numbers of atoms for each element in the reactants and products. 4.2: Reaction Stoichiometry A balanced chemical equation may be used to describe a reaction’s stoichiometry (the relationships between amounts of reactants and products). Coefficients from the equation are used to derive stoichiometric factors that subsequently may be used for computations relating reactant and product masses, molar amounts, and other quantitative properties. 4.3: Classifying Chemical Reactions - Precipitation Reactions Chemical reactions are classified according to similar patterns of behavior. This section will help you to differentiate between the different types of reactions which we commonly see in CHEM 145. You will also learn to write balanced equations for single and double replacement reactions. 4.4: Classifying Chemical Reactions - Acid Base Reactions Chemical reactions are classified according to similar patterns of behavior. This section will help you to differentiate between the different types of reactions which we commonly see in CHEM 145. You will also learn to write balanced equations for single and double replacement reactions. 4.5: Classifying Chemical Reactions - Combustion Reactions Chemical reactions are classified according to similar patterns of behavior. This section will help you to differentiate between the different types of reactions which we commonly see in CHEM 145. You will also learn to write balanced equations for single and double replacement reactions. 4.E: Stoichiometry of Chemical Reactions- Homework End of chapter homework problems for Chapter \(\PageIndex{1}\).