Rock salt - separating mixtures

Separating Mixtures: Rock Salt
This resource is a fully structured Year 8 lesson on separating mixtures using rock salt, designed to build strong conceptual understanding and practical skills.
Students learn what a mixture is, how rock salt can be separated, and why each separation method works, with a clear focus on physical properties such as solubility and boiling point. The lesson includes sequenced learning objectives, retrieval-based Do Now tasks, confidence-based checks, discussion prompts, and a 6-mark question with a mark scheme and model answer to stretch higher-attaining students.
The lesson supports:
clear Intent, Implementation and Impact
knowledge-first teaching with embedded Know & Show checks
structured scientific explanations, not just procedural steps
preparation for Chemistry while remaining accessible to Key Stage 3 learners
Included:
Clear learning objectives
Tier 3 vocabulary definitions
Step-by-step separation method (grinding, dissolving, filtration, evaporation)
Explanation of why each method works
Discussion statements and exit ticket questions
6-mark exam-style question with mark scheme and model answer
Suitable for:
Science | Chemistry |
This resource is ideal for teachers looking for a high-quality, classroom-ready lesson that balances practical science, deep thinking, and exam skill development.