This PowerPoint lesson covers the Arrhenius equation for IBDP Chemistry HL (first examination 2025), helping students understand how temperature affects the rate constant and how activation energy can be determined from experimental data. It provides a clear, structured explanation of one of the most important mathematical relationships in chemical kinetics and is ideal for building both conceptual understanding and exam confidence.
The Arrhenius equation links the rate constant, k, to temperature, T, activation energy, Eₐ, and the Arrhenius factor, A. It explains why reactions usually happen faster at higher temperatures and why reactions with lower activation energies are generally faster. This lesson helps students understand that the rate constant is not fixed for all conditions, but changes mainly with temperature and activation energy, making it a key idea for explaining differences in reaction speed.
This fully editable PowerPoint (.pptx) is designed for HL teaching, revision or flipped learning within the IB Diploma Programme. The lesson introduces the meaning of each term in the Arrhenius equation, explains what the Arrhenius factor represents in terms of collision frequency and orientation, and shows how the exponential term relates to the fraction of particles with enough energy to react. Students are then guided through the linear form of the Arrhenius equation, the construction and interpretation of an Arrhenius plot, and the use of the graph’s gradient and intercept to determine activation energy and A. The resource also includes the two-temperature form of the equation, allowing activation energy to be calculated directly from two values of k without plotting a graph.
The lesson includes a retrieval starter, key definitions, worked explanations, graph analysis, unit reminders and practice questions with answers. It is especially useful for preparing students for IB exam questions involving kinetics calculations, Arrhenius plots and the interpretation of temperature effects on reaction rate.
File type included: editable PowerPoint (.pptx)
Last updated: 2026 – improved graph interpretation, clearer support for activation energy calculations, and enhanced practice tasks aligned to IB HL assessment objectives.
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BUNDLE R2 How Much, How Fast and How Far? SL & HL (IBDP Chemistry)
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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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