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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:

  • Balancing Chemical Equation
    • Rules for Balancing Chemical Equations

Chemical reactions can be represented by a chemical equation. The reactants are written on the left-hand side (L.H.S) of the equation while the products are on the right-hand side (R.H.S). 

\( \scriptsize \underset{L.H.S}{REACTANTS} \; \rightarrow \; \underset{R.H.S}{PRODUCTS} \)

Balancing Chemical Equation:

Equations must be balanced in order to agree with the law of conservation of mass which states that in an ordinary chemical reaction, matter can neither be created nor destroyed.

An unbalanced equation would imply that atoms have been created or destroyed. For example, when hydrogen reacts with oxygen to form water, the chemist writes the equation for the reaction as:

 

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