How Fast? The Rate of Chemical Change
Collision theory, factors affecting rate, and rate equations.
R2.2.1 Rate of Reaction
Change in concentration per unit time, determining rates from graphs.
→R2.2.2 Collision Theory
Sufficient energy, proper orientation and collision geometry.
→R2.2.3 Factors Affecting Rate
Pressure, concentration, surface area, temperature and catalysts.
→R2.2.4 Activation Energy
Maxwell–Boltzmann energy distribution curves and Eₐ.
→R2.2.5 Catalysts
Alternative reaction pathways, energy profiles and Maxwell–Boltzmann.
→HL EXTENSION
R2.2.6 Reaction Mechanisms
Elementary steps, intermediates and the rate-determining step.
→R2.2.7 Energy Profiles
Activation energy and transition states in multistep reactions.
→R2.2.8 Molecularity
Unimolecular, bimolecular and termolecular elementary steps.
→R2.2.9 Rate Equations
Deducing rate equations from experimental data.
→R2.2.10 Order of Reaction
Graphical representations of zero, first and second order.
→R2.2.11 The Rate Constant
Temperature dependence and units of k.
→R2.2.12 The Arrhenius Equation
Temperature dependence of k to determine activation energy.
→R2.2.13 The Arrhenius Factor
Frequency of collisions with proper orientations.
→Exam Practice
MCQs, data analysis & structured questions with mark schemes.
Flashcards
Review key definitions and concepts with interactive flashcards.