Description
A clear, ready-to-teach lesson pack designed to introduce KS3 students to the particle model of matter and the behaviour of solids, liquids and gases. The lessons help students understand how scientists use particle models to explain everyday phenomena such as diffusion, dissolving and changes of state.

This resource contains six fully editable PowerPoint lessons that build understanding step-by-step, moving from observing the properties of matter to using the particle model to explain real-world processes.

The sequence develops students’ thinking from observable properties → creating simple models → the scientific particle model → diffusion → changes of state → applying the model to everyday situations.

What’s included
• 6 fully editable PowerPoint lessons
• Starter retrieval questions
• Key vocabulary slides
• Clear explanations of scientific ideas
• Knowledge-check activities with answers
• Opportunities for discussion and modelling activities

Topics covered
• Observing the properties of solids, liquids and gases
• Developing simple models to explain matter
• The particle model of solids, liquids and gases
• Particle movement and energy
• Diffusion in liquids and gases
• Changes of state (melting, freezing, evaporation and condensation)
• Applying the particle model to everyday situations

Suitable for
• KS3 Science
• KS3 Chemistry
• Foundation GCSE preparation

Ideal for teachers looking for clear, structured lessons to introduce the particle model and build understanding of matter and changes of state.