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SS1: CHEMISTRY - 1ST TERM

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  1. Introduction to Chemistry and Laboratory Apparatus | Week 1
    5 Topics
    |
    1 Quiz
  2. Nature of Matter | Week 2
    3 Topics
    |
    1 Quiz
  3. Separation Techniques I | Week 3
    1 Topic
  4. Separation Techniques II | Week 4
    5 Topics
    |
    1 Quiz
  5. Particulate Nature of Matter I | Week 5
    5 Topics
    |
    1 Quiz
  6. Particulate Nature of Matter II | Week 6
    9 Topics
    |
    1 Quiz
  7. Symbols, Formulae & Oxidation Number | Week 7
    7 Topics
    |
    1 Quiz
  8. Laws of Chemical Combination | Week 8
    4 Topics
    |
    1 Quiz
  9. Chemical Equation & Chemical Combination (Chemical Bonding) I | Week 9
    4 Topics
    |
    1 Quiz
  10. Chemical Combination (Chemical Bonding) II | Week 10
    4 Topics
    |
    1 Quiz
  11. Chemical Combination (Chemical Bonding) III & Shapes of Covalent Molecules | Week 11
    3 Topics
    |
    1 Quiz



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Topic Content:

  • Writing Chemical Formulae
  • Oxidation Numbers of Some Elements
  • Formulae Containing Radicals
  • Acid Radicals
  • Oxidation Numbers of Radicals

Compounds are made up of molecules and the formula of a molecule of a compound is combined in correct proportions or valencies.

A chemical formula is defined as a collection of chemical symbol that is used to show the elements present in any compound and its proportion.

Writing Chemical Formulae:

In writing chemical formulae, valency, which can be regarded as oxidation numbers, will be considered. 

Valency is the combining power of an element.

The metals exhibit positive valency (oxidation number) because they give out electrons while non-metals exhibit negative valency (oxidation number) because they accept electrons.

Oxidation Numbers of Some Elements:

 

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