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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
    |
    1 Quiz
  6. Particulate Nature of Matter II | Week 6
    9Topics
    |
    1 Quiz
  7. Symbols, Formulae & Oxidation Number | Week 7
    7Topics
    |
    1 Quiz
  8. Laws of Chemical Combination | Week 8
    4Topics
    |
    1 Quiz
  9. Chemical Equation & Chemical Combination (Chemical Bonding) I | Week 9
    4Topics
    |
    1 Quiz
  10. Chemical Combination (Chemical Bonding) II | Week 10
    4Topics
    |
    1 Quiz
  11. Chemical Combination (Chemical Bonding) III & Shapes of Covalent Molecules | Week 11
    3Topics
    |
    1 Quiz
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1. Write down the symbol of Elements or radicals

2. Write the Oxidation numbers above and to the right of the symbol or radical

3. Now write the symbols again, reversing the Oxidation numbers and writing the numbers (but not 1) below and to the right of the symbol. Omit the signs.

Let us apply these rules in writing the Chemical formula of sodium tetraoxosulphate(IV)

Rule INa SO4
Rule IINa+SO42-
Rule IIINa2SO4

= Na2SO4

Example II

 Write down the molecular formula of the following 

1. Sodium trioxonitrate(V)

2. Iron(iii) Chloride

3. Calcium Oxide

4. Potassium tetraoxosulphate(VI)

1. Sodium trioxonitrate(V)

Rule INaNO3
Rule IINa+ \( \scriptsize \searrow \)\( \scriptsize \swarrow\) NO3
Rule IIINaNO3

= NaNO3

2. Iron(III) Chloride

Rule IFeCl
Rule IIFe3+\( \scriptsize \searrow \)\( \scriptsize \swarrow\)Cl
Rule IIIFeCl3

= FeCl3

3. Calcium Oxide

Rule ICaO
Rule IICa\( \scriptsize \searrow \)\( \scriptsize \swarrow\)O
Rule IIICaO

=CaO

4. Potassium tetraoxosulphate(VI)

Rule IKSO4
Rule IIK+\( \scriptsize \searrow \)\( \scriptsize \swarrow\)SO42- 
Rule IIIK2SO4

= K2SO4

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