Chapter 6 of chemistry likely covers Reaction Rate and Stoichiometry. Reaction rate is the measure of how fast or slow a chemical reaction takes place, and stoichiometry is the study of the quantitative relationships between reactants and products in a chemical reaction. In this chapter, you may learn how to calculate reaction rates, how to use stoichiometry to determine the amounts of reactants and products in a chemical reaction, and how to apply these concepts to various types of reactions. The chapter may also cover topics such as reaction mechanisms, factors that affect reaction rates, and collision theory.