The article contains sections titled: 1. Introduction 2. Fundamentals 2.1. Chemical Rates 2.2. Relative Degree of Conversion 2.3. Selectivity and Yield 3. Microkinetics 3.1. Elementary Reactions 3.1.1. Fundamentals 3.1.2. Influence of Temperature 3.1.3. Influence of Concentration 3.2. Chemical Equilibria 3.3. Complex Reaction Schemes 3.3.1. Fundamentals 3.3.2. Polymerization Reactions 3.3.2.1. Conversion-Time Curve 3.3.2.2. Radical Intermediates Concentration 3.3.3. Heterogeneous Catalytic Reactions 3.3.3.1. Monomolecular Reactions 3.3.3.2. Bimolecular Reactions 3.3.4. Biochemical Reactions 4. Macrokinetics: Single-Phase Systems 4.1. Introduction 4.2. Macromixing 4.2.1. Residence-Time Distribution (RTD) 4.2.2. Batch Reactor (BR) 4.2.3. Plug-Flow Reactor (PFR) 4.2.4. Continuous, Ideally Stirred Tank Reactor (CISTR) 4.3. Micromixing 4.4. Sequence of Mixing 5. Macrokinetics: Multiphase Systems—Part I: Mass Transfer without Reaction 5.1. Introduction 5.2. Penetration Models 5.3. Stagnant Film Model 5.4. Mass-Transfer Coefficients 6. Macrokinetics: Multi-phase Systems—Part II: Mass Transfer with Reaction 6.1. Mass Transfer with Reaction in Series 6.1.1. Introduction 6.1.2. Monomolecular First-Order Kinetics 6.1.3. Arbitrary Monomolecular Kinetics 6.1.4. Multiple Phases 6.1.5. Bimolecular Reactions 6.1.6. Case Study: Shrinking Core Model 6.1.7. Selectivities of Multiple Reactions 6.1.7.1. Introduction 6.1.7.2. Parallel Reactions 6.1.7.3. Consecutive Reactions 6.1.7.4. Complex Reaction Schemes 6.2. Mass Transfer with Simultaneous Reaction 6.2.1. Introduction 6.2.2. Reaction of Gases in Porous Solids 6.2.2.1. Introduction 6.2.2.2. Monomolecular First-Order Kinetics 6.2.2.3. Monomolecular Arbitrary Kinetics 6.2.2.4. Bimolecular Reactions 6.2.2.5. Anisotropic Catalyst Pellets 6.2.3. Reactions of Gases in Liquids—Part I: Gaseous Reactants Only 6.2.3.1. Introduction 6.2.3.2. Higbie Penetration Model 6.2.3.3. Surface Renewal Model 6.2.3.4. Stagnant Film Model 6.2.3.5. Comparison of Models for First-Order Kinetics 6.2.3.6. Comparison of Hatta Numbers with Thiele Moduli 6.2.3.7. Hatta Numbers for Arbitrary Kinetics 6.2.3.8. Case Study: Ideally Mixed Gas-Liquid Reactors 6.2.3.9. Selectivities of Multiple Reactions 6.2.4. Reactions of Gases in Liquids—Part II: Reactants from both the Gas and the Liquid 6.2.4.1. Introduction 6.2.4.2. Slow Reaction 6.2.4.3. Fast Reaction 6.2.4.4. Instantaneous Reaction 6.2.4.5. Van Krevelen-Hoftijzer Approximation 6.2.4.6. Arbitrary Kinetics 6.2.4.7. Selectivities of Multiple Reactions 6.3. Combination of Simultaneous and Series Mass Transfer and Reaction 7. Macrokinetics: Multiphase Systems—Part III: Mass and Heat Transfer with Reaction 7.1. Introduction 7.2. Mass and Heat Transfer with Reaction in Series 7.2.1. Particle Mass and Heat Balances 7.2.2. Particle Multiplicity 7.3. Mass and Heat Transfer with Simultaneous Reaction 7.3.1. Frank-Kamenetzki Approximation 7.3.2. Thiele Moduli and Hatta Numbers 8. Acquisition of Reaction Kinetics 8.1. Reaction Rate Equations for Single-Phase Systems 8.1.1. Reaction Calorimeters 8.2 Reaction Rate Equations for Multiphase Systems 9. Multiscale Modeling