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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:

  • Discovery of Electron
  • Cathode Rays
  • Discovery of Proton
  • Discovery of Neutron
  • Millikan Oil-drop Experiment
  • Rutherford’s Atom

Discovery of Electron:

In 1897, J. J. Thompson produced experimental evidence for the existence of sub-particles known as electrons in the atom of every element (using the Cathode Ray Experiment).

He showed that when a high electrical potential was applied at very low pressure (about 0.001 mm Hg) on a glass tube using a cathode ray tube, the rays were observed to be emitted from the negative electrode (cathode) to the positive electrode (anode).

The rays were also found to be deflected by magnetic and electric fields. Since they emanated from the cathode to the anode, they were called cathode rays. It was then concluded that they must be of opposite charge for them to deflect towards the positive electrode, hence, they must be negatively charged particle electrons.

Cathode Rays:

Cathode rays are streams of negatively charged particles moving in straight lines with high velocities from the Cathode to the Anode.

Properties of Cathode Rays:

1. The rays are emitted at right angles to the electrodes.

 

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