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Chapter- 3 Atoms and Molecules

3.3 What is a molecule
3.4 Writing chemical formulae
3.5 Molecular mass
Chapter- Structure of The Atom
4.1 Charged particles in matter
4.2 The structure of an atom

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Chapter- Work and Energy

10.2 - Energy
10.3 - Rate of doing work
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Chapter- 12 Improvement in Food Resources

12.1 Improvement in Crop Yields
12.1.1 Crop Variety Improvement
12.1.2 Crop Production Management
12.1.3 Crop Protection Management

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