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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:

  • Meaning of Covalent Bonding
  • Formation of Chlorine molecule (Cl2)
  • Formation of Hydrogen molecule (H2)
  • Formation of Oxygen molecule (O2)
  • Formation of Nitrogen Molecule (N2)
  • Formation of Water Molecule (H2O)
  • Formation of Ammonia (NH3)
  • Formation of Methane (CH4)
  •  Formation of Carbon (IV) Oxide (CO2)
  • Types of Covalent Bonds (Non-Polar Covalent Bond, Polar Covalent Bond)
  • Factors that Determine Covalent Bonds
  • Characteristic Properties of Covalent Compounds

Covalency is the sharing of electrons between the atoms of non-metals. A covalent bond is formed when two atoms of non-metal contribute electron(s) equivalent to their valency for sharing.

After the bonding, both atoms will attain a stable octet or duplet structure of rare gases. Electrons are not transferred because the atoms involved are electron acceptors. The pair of electrons shared is known as the shared pair of electrons.

Diatomic molecules are formed by covalent bonding. e.g. Cl2, H2, N2, O2. In Chlorine molecules, only one electron is used in forming a covalent bond. The other six electrons form three lone pairs of electrons.

Formation of Chlorine molecule (Cl2):

Cl - Cl (Single Covalent bond)

Formation of Hydrogen molecule (H2):

 

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