KS3 ~ Year 8 ~ Mixtures

This lesson is designed for the KS3 Year 8 Science course, specifically the C2 1.3 unit on ‘Separation Techniques.

More Biology, Chemistry and Physics resources can be found in my TES Shop: https://www.tes.com/teaching-resources/shop/SWiftScience

The lesson begins with a recap of particle arrangements in an element, compound and a mixture. Students will be asked to ‘Think > Pair > Share’ their ideas, drawing a diagram of the particle arrangement in each as an extra challenge. After a short discussion, the answers will be revealed so students can check their work.

The next task requires students to organise a set of statements into two columns - those statements describing a mixture or describing a compound. This task can then be self-assessed using the mark scheme provided once complete.

Students are now asked to ‘Think > Pair > Share’ their ideas about what the term ‘pure’ means. After a short class discussion, the definitions (along with examples) for pure and impure substances are provided. Students will now complete an investigation to test three different water samples for purity. Using a pH test and an evaporation test students need to decide which of the samples are pure and which are impure. Students will have the chance to report their findings to the rest of the classroom, explaining their thoughts on which samples were pure/impure.

Lastly, students will watch a video on chemical tests used to check the purity of a substance. Students will need to answer a set of questions whilst watching this video, the answers to which are included in the PowerPoint so students can self-assess their work once it is complete.

The plenary task requires students to spend a minute talking to the person next to them about what they have learned this lesson.

All resources are included at the end of the presentation, thanks for looking, if you have any questions please let me know in the comments section and any feedback would be appreciated