pptx, 1 MB
pptx, 1 MB

5 Lessons on changing materials.
Lesson 1:What are soluble and insoluble materials?
Lesson2:What and how can materials be separated?
Lesson 3:What are revisable and irreversible changes?
Lesson 4:What is oxidation and when and why does it happen?
Lesson 5:How are new materials formed?

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