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SS1: CHEMISTRY - 1ST TERM

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  1. Introduction to Chemistry and Laboratory Apparatus | Week 1
    5Topics
    |
    1 Quiz
  2. Nature of Matter | Week 2
    3Topics
    |
    1 Quiz
  3. Separation Techniques I | Week 3
    1Topic
    |
    1 Quiz
  4. Separation Techniques II | Week 4
    5Topics
    |
    1 Quiz
  5. Particulate Nature of Matter I | Week 5
    5Topics
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    1 Quiz
  6. Particulate Nature of Matter II | Week 6
    9Topics
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    1 Quiz
  7. Symbols, Formulae & Oxidation Number | Week 7
    7Topics
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    1 Quiz
  8. Laws of Chemical Combination | Week 8
    4Topics
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    1 Quiz
  9. Chemical Equation & Chemical Combination (Chemical Bonding) I | Week 9
    4Topics
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    1 Quiz
  10. Chemical Combination (Chemical Bonding) II | Week 10
    4Topics
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    1 Quiz
  11. Chemical Combination (Chemical Bonding) III & Shapes of Covalent Molecules | Week 11
    3Topics
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    1 Quiz
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Sublimation is a phenomenon in which solid substances, when heated, changes directly to a gas, or a gas when cooled changes directly to solid without passing through the intermediate liquid state. Such solids are said to sublime.

Substances that sublimate are ammonium chloride, iodine, camphor, naphthalene, etc.

Sublimation

Procedure:

Place the mixture in an evaporating dish, cover it with an inverted funnel which has been blocked with cotton wool.

On heating, the ammonium chloride decomposes to give dense white fumes, which solidifies to give a white crystal, called sublimate, inside the inverted funnel, leaving sodium chloride in the dish as residue.

Iodine, camphor, naphthalene are purified by sublimation.

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