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Unit Overview: Particles in physical and chemical changes

National Curriculum

  • Know that some materials will dissolve in liquid to form a solution, and describe how to recover a substance from a solution
  • Use knowledge of solids, liquids and gases to decide how mixtures might be separated, including through filtering, sieving and evaporating
  • Give reasons, based on evidence from comparative and fair tests, for the particular uses of everyday materials, including metals, wood and plastic
  • Demonstrate that dissolving, mixing and changes of state are reversible changes
  • Explain that some changes result in the formation of new materials, and that this kind of change is not usually reversible, including changes associated with burning and the action of acid on bicarbonate of soda

Lessons:

6 lessons

What happens to particles during dissolving?

In this lesson, we will learn what happens to particles during dissolving. We will investigate what happens when we mix water with salt, sugar and sand. For this lesson you will need a pencil and a piece of paper. If you would like to take part in the practical you will also need a glass of water and some sugar and salt. If you do not have these things then you can still take part in the lesson by watching the teacher's demonstration.

  • 2 Quizzes
  • 32m Video
  • Presentation(PPT)
  • Transcript

How can we tell a chemical reaction has taken place?

In this lesson, we will learn about the difference between physical changes and chemical reactions. We will learn about the particles in both of these types of change and the signs to look out for in a chemical reaction. You will need a pencil, a ruler and a piece of paper for this lesson. If you have baking soda and vinegar then you will need that for an investigation too, but don't worry you can still take part without these things.

  • 2 Quizzes
  • 33m Video
  • Presentation(PPT)
  • Transcript