IB-Chemistry
Reactivity 2
IB Chemistry lessons and exam-style practice covering stoichiometry, reaction rates and equilibrium.
Lessons in this unit
Work through the topics in order.
R-2.1.1 Balancing chemical equations
Learn how to balance chemical equations by adjusting stoichiometric coefficients while conserving atoms of each element.
R-2.1.2 Equations and ratio calculations
IB Chemistry SL lesson covering mole ratios and calculations involving reacting masses, volumes and solution concentrations.
R-2.1.3 Limiting reactant and theoretical yield
IB Chemistry SL lesson covering limiting and excess reactants, theoretical yield and experimental yield.
R-2.1.4 Percentage yield
IB Chemistry SL lesson covering theoretical and experimental yield, limiting reactants and percentage yield calculations.
R-2.1.5 Atom economy
IB Chemistry SL lesson covering atom economy, stoichiometric calculations and the relationship between atom economy and industrial waste.
R-2.2.1 Rate of reaction
IB Chemistry SL lesson covering rates of reaction and calculations from concentration, volume or mass against time graphs.
R-2.2.11 The Rate Constant and Units of k
Explore the rate constant, k, its dependence on temperature, and how its units are determined from the overall reaction order while solving rate equation problems.
R-2.2.12 & 2.2.13 Arrhenius Equation and Activation Energy
Explore the Arrhenius equation, analyse its linear graphical form, calculate activation energy from rate constants and temperature, and understand the significance of the Arrhenius factor.
R-2.2.2 & 2.2.3 Collision theory and factors affecting rates
IB Chemistry SL lesson covering collision theory and the effects of pressure, concentration, surface area, temperature and catalysts on reaction rate.
R-2.2.4 & 2.2.5 Activation energy and catalysts
IB Chemistry SL lesson covering activation energy, catalysts, Maxwell–Boltzmann distributions and alternative reaction pathways.
R-2.2.6 & 2.2.7 & 2.2.8 Reaction Mechanisms, Energy Profiles and Molecularity
Explore multistep reaction mechanisms, intermediates and transition states, identify the rate-determining step using energy profiles, and interpret the molecularity of elementary steps.
R-2.2.9 & 2.2.10 Rate Equations and Reaction Order
Learn how to deduce rate equations from experimental data, determine individual and overall reaction orders, and analyse graphs for zero-, first- and second-order reactions.
R-2.3.1 Dynamic equilibrium
IB Chemistry SL lesson covering dynamic equilibrium, closed systems and the characteristics of physical and chemical systems at equilibrium.
R-2.3.2 & 2.3.3 Equilibrium constant and interpretation
IB Chemistry SL lesson covering equilibrium constant expressions, the magnitude of K, temperature dependence and reverse reactions.
R-2.3.4 Les Chatellier principle
IB Chemistry SL lesson covering Le Châtelier’s principle and the effects of concentration, temperature and pressure on equilibrium.
R-2.3.5 Reaction Quotient and Predicting Equilibrium Direction
Learn how to calculate the reaction quotient, Q, from non-equilibrium concentrations and use it to predict the direction a reaction will proceed to reach equilibrium.
R-2.3.6 & 2.3.7 Equilibrium Law, Equilibrium Constant and Gibbs Energy
Use the equilibrium law to calculate equilibrium concentrations and explore how the equilibrium constant and Gibbs energy can be used to predict the position of equilibrium.