This bundle of PowerPoints covers IBDP Chemistry R1.1 Measuring Enthalpy Changes for first examination 2025, giving students a clear, structured introduction to energy transfer, exothermic and endothermic processes, and calorimetry. It is designed to help students build a strong conceptual and calculation-based foundation in energetics, moving from basic energy ideas to the practical measurement of enthalpy change.

In this topic, students learn how energy is transferred during physical and chemical changes and how these transfers can be measured. The bundle begins by developing the ideas of system and surroundings, the law of conservation of energy, and the difference between heat and temperature. It then moves on to classify reactions as exothermic or endothermic, using temperature changes and energy profile diagrams to explain the direction of energy transfer. Finally, students apply these ideas quantitatively through enthalpy, thermochemical equations, and calorimetry, using Q = mcΔT and related mole calculations to determine enthalpy changes from experimental data.

This fully editable bundle includes 3 PowerPoint (.pptx) lessons: Lesson 1 Energy Transfer in Chemical Reactions, Lesson 2 Exothermic and Endothermic Reactions, and Lesson 3 Enthalpy and Heat Transfers. Across these lessons, students encounter key ideas such as the first law of thermodynamics, chemical potential energy, standard enthalpy change, thermochemical equations, specific heat capacity, and sources of error in calorimetry experiments. The resource also includes practical discussion of coffee cup, metal and bomb calorimeters, assumptions used in aqueous calorimetry, and why heat loss affects accuracy.

The bundle includes retrieval starters, keyword definitions, worked explanations, real-world examples, calculation practice and questions with answers. It is ideal for first teaching, revision, or building a full energetics 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 calorimetry and ΔH calculations, and enhanced practice tasks aligned to IB assessment objectives.