07 Nov 2024
🧫🧪👨🏻🔬 Mr Mikhaiel’s Year 7 Science students are currently engaged with the concept of mixtures and developing important practical skills in science! The unit on mixtures is a great opportunity for students to explore the different types of mixtures and the methods used to separate them.
Sand, Salt, and Iron Filings Separation: In this activity, students are using the combination of magnetic separation (to remove iron filings), filtration (to separate sand from the salt solution), and evaporation (to recover salt from the filtered solution). These methods allow them to physically manipulate the components and observe how different techniques work for different substances.
After each separation technique, students could discuss and record their observations about why each method works, including the properties of the materials involved (e.g., magnetism, solubility, particle size). Students could brainstorm real-world examples where these techniques are used. For example, how are water and oil separated in cooking? How do we purify salt from seawater?
As an extension, students investigate how to separate more complex mixtures and some other materials (e.g., plastic beads, sugar, etc.), using the techniques they’ve learned. Students could investigate which solutes dissolve in different solvents (e.g., does sugar dissolve in cold water vs. hot water?) and measure the rate of dissolving.