Five techniques, and one decision that picks between them. Seven lessons, seven labs, a chapter map, and thirty questions.
Chapter 3 told you that the constituents of a mixture keep their own physical properties. This chapter turns that into a tool: if two substances differ in some property, that difference is a handle you can grab to pull them apart.
Magnetic or not → magnet. Different particle sizes → filtration. A dissolved solid you want → evaporation. A liquid you want → distillation. Different solubilities → chromatography.
You will only ever be asked to memorise five techniques. What earns the marks is choosing the right one, in the right order, and saying why.
This is scoped for G3. The reverse-osmosis detail the textbook marks optional for G2 is core here — and it is exactly the part Section 4.3 is built on.
Iron filings from sulfur, and iron from scrap metal in a Singapore scrapyard.
Start → Lesson 3Residue and filtrate, pores and particle sizes — and the one mixture filtration cannot touch.
Start → Lesson 4Getting the dissolved solid back. Salt pans, dried ikan bilis, and what you lose.
Start → Lesson 5Boiling and condensation. The distillate, the water cycle, and the solar still.
Start → Lesson 6Substances that dissolve to different extents. Watch an ink spot separate into four.
Start →Every definition, the decision table, all five techniques with their applications, and the water facts.
Open → PracticeLabel the apparatus, sort the techniques, plan a multi-step separation — every wrong answer explains itself.
Practice → Challenging · Lvl 2Twenty harder questions with the options set deliberately close together — only correct reasoning separates them.
Take it on →