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R2.2 The Rate Expression & its Experimental Determination, HL (IBDP Chemistry)

R2.2 The Rate Expression & its Experimental Determination, HL (IBDP Chemistry)

Subject: Chemistry

Age range: 16+

Resource type: Lesson (complete)

Last updated

12 May 2026

pptx, 1.72 MB
pptx, 1.72 MB

This PowerPoint lesson covers the rate expression and its experimental determination for IBDP Chemistry HL (first examination 2025), helping students deduce rate laws from experimental data. It provides a clear, step-by-step introduction to how chemists determine the effect of reactant concentration on reaction rate and how reaction orders are identified.

A rate expression (or rate law) is a mathematical relationship showing how the rate of a reaction depends on the concentration of its reactants. In a general form such as rate ∝ [A]ᵃ[B]ᵇ, the powers show the order of reaction with respect to each reactant. This lesson helps students understand what it means for a reactant to be zero order, first order or second order, and why these powers cannot simply be predicted from the balanced equation but must be determined experimentally.

This fully editable PowerPoint (.pptx) is designed for HL teaching, revision or flipped learning within the IB Diploma Programme. The lesson introduces the basic meaning of rate expressions and then develops the initial rates method, where the concentration of one reactant is changed while the other is kept constant. Students learn how to compare changes in concentration with changes in initial rate in order to deduce reaction order and write the full rate law. The resource includes clear examples showing how doubling, tripling or quadrupling concentration affects rate depending on whether the reaction is first, second or zero order in that reactant.

The lesson includes a retrieval starter, keyword definitions, worked explanations, summary tables and practice opportunities to help students build confidence in analysing data and constructing rate expressions. It is especially useful for preparing students for IB exam questions involving kinetics, reaction orders and experimental determination of rate laws.

File type included: editable PowerPoint (.pptx)
Last updated: 2026 – improved explanation of reaction order, clearer support for the initial rates method, and enhanced practice tasks aligned to IB HL assessment objectives.

Get this resource as part of a bundle and save up to 33%

A bundle is a package of resources grouped together to teach a particular topic, or a series of lessons, in one place.

Bundle

BUNDLE R2.2 How Fast? The Rate of Chemical Change, HL Content Only (IBDP Chemistry)

This bundle of PowerPoints covers IBDP Chemistry HL R2.2 How Fast? The Rate of Chemical Change for first examination 2025, focusing entirely on the Higher Level content with no SL lessons included. It is designed to help students move beyond the core ideas of collision theory and reaction rate into the more advanced kinetic models, calculations and mechanistic reasoning required at HL. In this part of the course, students develop a deeper understanding of how and why reactions happen at different speeds by studying reaction pathways in detail. The bundle explores reaction mechanisms, energy profiles, molecularity, rate expressions, orders of reaction, and the Arrhenius equation. These ideas allow students to connect observable rate data to particle-level explanations, identify the rate-determining step, recognise intermediates and transition states, and explain how temperature and activation energy influence the rate constant, k. This fully editable bundle includes 5 PowerPoint (.pptx) lessons: HL Reaction Mechanisms, HL Energy Profiles and Molecularity, HL The Rate Expression and its Experimental Determination, HL Orders of Reaction and Reaction Mechanism, and HL Arrhenius Equation. Across these lessons, students learn how to evaluate proposed mechanisms, deduce rate equations from experimental data, analyse zero-, first- and second-order behaviour, determine the units of k, interpret Arrhenius plots, and calculate activation energy and the Arrhenius factor from experimental results. The bundle includes retrieval starters, key word definitions, worked explanations, graph analysis, data interpretation and practice questions with answers. It is ideal for first teaching, revision, or building a complete HL kinetics sequence aligned to the IBDP Chemistry specification for first examination 2025. File types included: editable PowerPoint (.pptx) files. Last updated: 2026 – improved sequencing, clearer support for rate law and Arrhenius calculations, and enhanced practice tasks aligned to IB HL assessment objectives.

£6.70

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