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class VII

Key Concepts

substances, elements, solution, mixtures, states of matter, solid, liquid, gases

essential questions

1. How do pure substances and mixtures compare?
2.How can matter be classified?
3. How is matter classified?
4. How can mixtures be separated?


  1. What is suspension?
  2. How do we separate mixtures? Name 10 methods of separating mixtures.
  3. Define Mixture. Give 2 examples.
  4. Define immiscible liquids.
  5. Define miscible liquids.
  6. Define distillation.
  7. Give two examples of: a) Liquid+ Liquid mixture  b) Solid + Solid mixture  c) solid + liquid mixture
  8. Give 4 examples of non metallic elements
  9. Define Metalloids. Give 2 examples.
  10. Define elements. Give 2 examples


  1. Write the difference between : a) homogenous mixtures and heterogeneous mixtures   b) Solution and Alloy  c) Suspension and Emulsion
  2. What are emulsion paints? How are they formed?
  3. What is sublimation? Explain with diagram.
  4. What is distillation? Explain with diagram.
  5. How is fractional distillation different from gravity separation?
  6. How are element and compounds different from each other?
  7. What is a mixture?
  8. Write the differences between elements, compounds and mixture.
  9. Why sugar solution in water is called a mixture?


  1. A beverage company wants to ensure that every bottle of soft drink that comes out of bottling plant tastes same. Can you suggest a method which can help them do that? Also give reasons for the process you have suggested.
  2. There is milk kept in 3 different beakers. Bojoho wants to know which is pure and hos not been adulterated. How will he test it?
  3. Why do we use the process of fractional distillation to separate petroleum products? Why gravity separation cannot be used here?


  1. In what category will you classify emulsion paints into elements, compounds or mixtures? Give reasons.


  1. Naphthalene balls: Dry ice :: Sugar solution : salt solution

Find the analogy or relationship between the two.