How much, how fast and how far?: notes and practice questions

This topic covers using chemical equations to quantify the amount of chemical change. Chemical equations show the mole ratio of reactants and products, including state symbols.

This topic covers how the rate of a chemical reaction can be controlled. Reaction rate is the change in concentration of a reactant or product per unit time.

This topic covers the characteristics of dynamic equilibrium and how the equilibrium constant and Le Châtelier's principle are used to predict the extent and direction of reversible reactions. Dynamic equilibrium occurs in a closed system when forward and reverse reaction rates are equal.

This topic has no additional higher level content beyond the standard level material. All content for Reactivity 2.1, including chemical equations, mole ratios, limiting reactants, theoretical, experimental, and percentage yields, is covered by both Standard Level and Higher Level students.

This topic covers advanced reaction kinetics, including multistep mechanisms and the Arrhenius equation. The rate-determining step is the slowest elementary step in a reaction mechanism.

This topic extends the understanding of chemical equilibrium by introducing the reaction quotient and its relationship to the direction of a reaction. The reaction quotient, $Q$, is calculated using non-equilibrium concentrations to predict the direction a reaction will shift to reach equilibrium.