This GCSE Physics PowerPoint presentation provides a comprehensive and engaging lesson on changes of state, designed specifically for AQA GCSE Combined Science Physics. It covers how substances transition between solid, liquid, and gas, and explains how energy transfer and particle behavior are involved in each change of state. The resource also helps students interpret heating and cooling curves, describe the characteristics of pure substances, and understand key terms such as melting point and boiling point.
A change of state is a physical process in which a substance alters its form due to energy changes, without changing its chemical composition. This lesson covers melting, freezing, boiling, evaporation, condensation, sublimation, and deposition. It explains that during these changes, the temperature may remain constant as energy is used to break or form intermolecular bonds, and the mass of the substance is conserved throughout.
The presentation includes starter questions, interactive diagrams, and student tasks, such as labelling particle diagrams and completing heating curve graphs. Special attention is given to the difference between boiling and evaporation, the effect of impurities on melting/boiling points, and a practical investigation using stearic acid to produce a cooling curve.
Students are guided through the practical with a detailed method, risk assessment, data collection table, and graphing activity. There are also fill-in-the-gap tasks, extended questions with model answers, and critical thinking tasks, encouraging students to describe particle behavior at different stages of state changes.
The PowerPoint (.pptx) is fully editable, allowing teachers to adapt the lesson to suit the needs of their class.
Last updated: March 2025.
This is a high-quality, curriculum-aligned resource ideal for teachers and students wanting to build a strong understanding of changes of state in physics. Download now to enhance your lessons!
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