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This Nuffield 13 - 16 module is one for the start of the three-year programme. This B unit provided enough material for six double periods in the third year of secondary school (year nine). The teachers’ guide included six worksheets to supplement the students’ booklet.

1. How to sort things out
2. Some ways of classifying are better than others
3. Particles and properties
4. Looking for evidence
5. Diffusion supports the particle theory
6. How small are particles?
7. Final questions

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