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SS1: PHYSICS – 3RD TERM

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  1. Production of Electric Current | Week 1
    6 Topics
    |
    1 Quiz
  2. Electric Current | Week 2
    5 Topics
    |
    1 Quiz
  3. Electrical Resistance of a Conductor | Week 3
    5 Topics
    |
    1 Quiz
  4. Particulate Nature of Matter | Week 4
    5 Topics
    |
    1 Quiz
  5. Crystalline and Non-crystalline Substances | Week 5
    3 Topics
    |
    1 Quiz
  6. Elastic Properties of Solids | Week 6 & 7
    4 Topics
    |
    1 Quiz
  7. Fluids at Rest & in Motion | Week 8 & 9
    6 Topics
    |
    1 Quiz
  8. Solar Collector
    3 Topics
    |
    1 Quiz



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A crystal or crystalline substance/solid is a solid material whose constituents (such as atoms, molecules, ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

A crystal can also be defined as a piece of solid matter in which the atoms or molecules or ions are arranged in a regular repeating pattern or lattice.

There are four types of crystals: Covalent ionic, metallic and molecular.

Sodium Chloride Crystal Structure e1653559483811


Covalent Crystals: are crystals whose atoms are connected with covalent bonds. Covalent bonds exist when atoms share electrons. These bonds are extremely strong and difficult to break and they have a high melting point e.g. gluing together beads with super glue, diamond.

Ionic Crystals: are crystals whose atoms are held together by ionic bonds with ionic bond. One atom is negative and the other positive and are arranged in a pattern based on the charges. They possess a high melting point e.g. table salt.

Molecular Crystals: Crystals formed from a weak bond called hydrogen bonds. The bonds are weak and have a lower melting point e.g. dry ice.

Metallic Crystals: are crystals made from metal elements. They sparkle with a lustrous shine and are extremely good conductors of heat and electricity e.g. copper wire, silver, gold, etc.

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