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R2.3 Physical Equilibrium (IBDP Chemistry)

R2.3 Physical Equilibrium (IBDP Chemistry)

Subject: Chemistry

Age range: 16+

Resource type: Lesson (complete)

Last updated

10 May 2026

pptx, 5.22 MB
pptx, 5.22 MB

This PowerPoint lesson covers physical equilibrium for IBDP Chemistry (first examination 2025) and gives students a clear introduction to one of the key ideas needed for understanding reversible processes. It is designed to help students recognise the features of a physical system at equilibrium and explain why equilibrium is dynamic rather than static.

Physical equilibrium occurs during a physical change when the rate of the forward process is equal to the rate of the reverse process. In other words, particles continue to move between states, but there is no overall change in the observable properties of the system. This lesson helps students understand equilibrium through accessible examples such as water evaporating and condensing in open and closed systems and iodine subliming and depositing in a sealed container. These examples make the concept of dynamic equilibrium easier to visualise and explain.

This fully editable PowerPoint (.pptx) is ideal for classroom teaching, revision or flipped learning in the IB Diploma Programme. The lesson introduces key terms such as physical equilibrium, closed system, dynamic equilibrium and macroscopic property, then develops the idea that a closed system is required for equilibrium to be established. Students are guided to understand why equilibrium cannot be reached in an open system when matter escapes, and why at equilibrium the system appears unchanged even though particles are still changing state continuously.

The resource includes a retrieval starter activity, clear definitions, step-by-step explanations, real-world and laboratory-based examples, and opportunities for students to connect particle behaviour with visible observations such as constant water level or constant iodine colour. It is especially useful for helping students build strong conceptual foundations before moving on to chemical equilibrium.

File type included: editable PowerPoint (.pptx)
Last updated: 2026 – improved explanations of dynamic equilibrium, strengthened closed-system examples, and refined lesson flow to align with IB Chemistry first examination 2025.

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 How Much, How Fast and How Far? SL Content Only (IBDP Chemistry)

This bundle of PowerPoints covers IBDP Chemistry SL R2: How Much, How Fast and How Far? for first examination 2025, bringing together quantitative chemistry, kinetics and equilibrium in one structured teaching resource. It is designed to help students build secure understanding across the whole SL R2 topic, from writing equations and calculating yields to explaining reaction rates and predicting equilibrium changes. In IBDP Chemistry, this area of the course focuses on three linked ideas: how much chemical change occurs, how fast it happens, and how far a reversible reaction proceeds before reaching equilibrium. This bundle supports students in mastering those ideas step by step. The lessons move from stoichiometry and reacting ratios, through collision theory and Maxwell–Boltzmann distributions, to physical and chemical equilibrium, Kc and Le Châtelier’s principle. This makes the bundle ideal for teaching the full SL R2 topic in a coherent sequence rather than as isolated lessons. The bundle includes 11 editable PowerPoint (.pptx) lessons: R2.1 Chemical Equations, Reacting Ratios, Limiting and Excess Reactants, Theoretical and Percentage Yield, and Atom Economy. R2.2 Rate of Reaction, Factors Affecting the Rate of Reaction, and Maxwell–Boltzmann Distribution Curves. R2.3 Physical Equilibrium, Chemical Equilibrium, The Equilibrium Constant Kc and Magnitude of Kc, and Le Châtelier’s Principle. Across the bundle, students are supported with retrieval starters, key word definitions, worked examples, calculations, graph interpretation, particle-level explanations, and practice questions with answers. The resources are suitable for first teaching, revision, cover lessons or flipped learning, and they align closely with the IBDP Chemistry specification for first examination 2025. File types included: editable PowerPoint (.pptx) files. Last updated: 2026 – refined lesson sequencing, improved clarity of calculations and explanations, and enhanced practice tasks across stoichiometry, kinetics and equilibrium.

£14.80
Bundle

BUNDLE R2.3 How Far? The Extent of Chemical Change, SL Content Only (IBDP Chemistry)

This bundle of PowerPoints covers IBDP Chemistry SL R2.3 How Far? The Extent of Chemical Change for first examination 2025, including physical equilibrium, chemical equilibrium, the equilibrium constant Kc, and Le Châtelier’s principle. It provides a clear, carefully sequenced set of lessons that help students move from the basic idea of dynamic equilibrium to quantitative equilibrium expressions and prediction of equilibrium shifts. The extent of chemical change describes how far a reversible process or reaction proceeds before equilibrium is established. In this topic, students learn that equilibrium is a dynamic state reached in a closed system, where forward and reverse processes continue at equal rates and macroscopic properties remain constant. The bundle begins with physical equilibrium, using familiar examples such as evaporation and condensation and iodine sublimation, before moving into chemical equilibrium in reversible reactions such as the Haber process. This gives students a strong conceptual foundation before introducing calculations and prediction. The bundle includes 4 editable PowerPoint (.pptx) lessons. Lesson 1: Physical Equilibrium explains dynamic equilibrium in physical systems and the importance of a closed system. Lesson 2: Chemical Equilibrium develops the same ideas for reversible chemical reactions and introduces equilibrium graphs and homogeneous systems. Lesson 3: The Equilibrium Constant Kc and Magnitude of Kc teaches students how to write Kc expressions, calculate Kc from equilibrium concentrations, and relate the size of Kc to the composition of the equilibrium mixture. Lesson 4: Le Châtelier’s Principle helps students predict and explain the effect of changing concentration, pressure, temperature and catalysts on equilibrium systems. Across the bundle, students are supported with retrieval starters, key definitions, worked examples, graph interpretation, equilibrium calculations, and practice questions with answers. This resource is ideal for first teaching, revision, or planning a complete SL equilibrium sequence aligned to the IBDP Chemistry 2025 specification. File types included: editable PowerPoint (.pptx) files. Last updated: 2026 – improved sequencing, clearer support for Kc calculations and equilibrium shifts, and enhanced practice tasks aligned to IB assessment objectives.

£5.35

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