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R1.4 Entropy, HL (IBDP Chemistry)

R1.4 Entropy, HL (IBDP Chemistry)

Subject: Chemistry

Age range: 16+

Resource type: Lesson (complete)

Last updated

15 May 2026

pptx, 12.89 MB
pptx, 12.89 MB

This PowerPoint lesson covers entropy and disorder for IBDP Chemistry (first examination 2025), helping students understand energy dispersal and predict entropy changes in physical and chemical processes. It provides a clear, structured approach to both conceptual understanding and calculation of standard entropy changes.

Entropy (S) is a measure of the disorder or randomness of particles in a system, as well as how energy is distributed. Systems with higher entropy have particles that are more spread out and more freely moving. This lesson supports students in linking entropy to states of matter, showing that entropy generally increases from solid to liquid to gas, and in applying this understanding to predict whether a process leads to an increase or decrease in entropy .

This fully editable PowerPoint (.pptx) is designed for teaching, revision or flipped learning within the IB Diploma Programme. Students are guided through entropy changes in physical processes (such as melting, evaporation and dissolving) and chemical reactions, with particular emphasis on the role of gas molecules in determining entropy changes. The lesson also introduces standard entropy values and shows how to calculate standard entropy change (ΔS°) using tabulated data .

The resource includes:
• Retrieval starter activity linking to prior energy topics
• Clear definitions of key terms such as entropy, thermodynamics and standard entropy
• Explanation of entropy in different states of matter
• Predicting entropy changes in physical and chemical processes
• Role of gas molecules in determining ΔS
• Calculation of ΔS° using standard entropy values
• Worked examples and practice questions with answers

This lesson is ideal for developing a strong foundation in thermodynamics and preparing students for exam-style questions involving entropy, spontaneity and Gibbs free energy.

File type included:
• Editable PowerPoint (.pptx)

Last updated: 2026 – improved explanations of entropy concepts, added clearer calculation examples, and enhanced practice questions aligned to IB 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 R1 What Drives Chemical Reactions? SL & HL (IBDP Chemistry)

This bundle of PowerPoints covers IBDP Chemistry R1: What drives chemical reactions? for first examination 2025, including both SL and HL content across energy transfer, enthalpy changes, fuels, entropy and Gibbs energy. It is designed to give teachers and students a complete, well-sequenced set of lessons for teaching the full R1 topic from core foundations through to Higher Level thermodynamics. In IBDP Chemistry, this topic explores the energetic and thermodynamic ideas that explain why reactions happen and whether they are feasible. Students begin with the basics of energy transfer in chemical reactions, including conservation of energy, system and surroundings, exothermic and endothermic processes, and calorimetry. They then move into bond breaking and forming, Hess’s law, and HL extensions such as standard enthalpy changes of combustion and formation and Born–Haber cycles. The topic also connects chemistry to real-world energy use through lessons on combustion reactions, incomplete combustion, fossil fuels, biofuels and fuel cells. The bundle also includes the full HL R1.4 section on entropy and spontaneity, helping students understand how disorder, enthalpy and temperature combine to determine whether a process is spontaneous. These lessons cover entropy, Gibbs energy and spontaneous changes, and Gibbs energy and equilibrium, making the resource especially useful for deeper HL teaching and revision. This fully editable bundle includes 15 PowerPoint (.pptx) lessons with retrieval starters, key word definitions, clear explanations, worked examples, calculation practice and questions with answers. It is ideal for first teaching, revision, cover lessons or building a full unit sequence aligned to the IBDP Chemistry specification for first examination 2025. File types included: editable PowerPoint (.pptx) files. Last updated: 2026 – improved sequencing, refined explanations, and enhanced practice tasks across SL and HL energetics and thermodynamics content.

£20.00
Bundle

BUNDLE R1.4 Entropy and Spontaneity HL Only Content (IBDP Chemistry)

This bundle of 3 PowerPoints covers IBDP Chemistry HL R1.4 Entropy and Spontaneity for first examination 2025, including entropy changes, Gibbs energy, spontaneity and the link between Gibbs energy and equilibrium. It provides a clear, carefully sequenced set of lessons that helps students move from core thermodynamic ideas to the higher-level calculations and interpretations required for IB exam success. Entropy and spontaneity are central ideas in thermodynamics. Entropy is a measure of disorder and energy dispersal in a system, and students need to understand how physical and chemical changes can increase or decrease entropy. This bundle helps students predict entropy changes, calculate standard entropy change, ΔS°, and then build on this understanding using Gibbs energy, ΔG, to decide whether reactions are spontaneous under given conditions. It also develops the important idea that spontaneity depends on the balance between enthalpy, entropy and temperature, not just whether a reaction is exothermic. The bundle includes 3 editable PowerPoint (.pptx) lessons: Lesson 1: Entropy – predicting entropy changes in physical and chemical processes and calculating ΔS° from standard entropy values. Lesson 2: HL Gibbs Energy and Spontaneous Changes – applying ΔG° = ΔH° − TΔS°, interpreting the sign of ΔG, and determining the temperature at which a reaction becomes spontaneous. Lesson 3: HL Gibbs Energy and Equilibrium – using ΔG = ΔG° + RT lnQ and ΔG° = −RT lnK to link thermodynamics with equilibrium and reaction direction. Across the bundle, students are supported with retrieval starters, clear keyword definitions, step-by-step explanations, worked calculations, conceptual examples and practice questions with answers. This makes the resource ideal for first teaching, revision, or building a complete HL thermodynamics sequence for IB Chemistry. File types included: editable PowerPoint (.pptx) files. Last updated: 2026 – improved sequencing, clearer Gibbs energy calculations, and enhanced practice tasks aligned to the IB Chemistry specification for first examination 2025.

£4.00

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