Back to Course

SS1: CHEMISTRY - 1ST TERM

0% Complete
0/0 Steps
  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
Lesson Progress
0% Complete

Physical Change:

Physical change is one which is easily reversible and in which no new substance is formed, for example when a solid (ice) is heated, it melts to form a liquid (water), on cooling, the Liquid solidifies to ice again.

Other examples of Physical change;

1. Dissolution of common salt in water.

2. Melting of ice, candle wax, etc.

3. Freezing of liquid to solid.

4. Vaporisation of liquid e.g. water.

5. Liquefaction of gasses.

6. Sublimation of camphor, iodine.

7. Magnetisation of iron.

Chemical Change:

Chemical change is one which is not easily reversible and in which new substances are formed. For example, the burning of firewood. It changes to charcoal and ash. This is a chemical change as we cannot get back the firewood anymore. 

Other examples of chemical change:

1. Rusting of iron

2. Burning of any substance in air. e.g. coal, paper, magnesium ribbon,  wood, etc.

3. Dissolution of metal or limestone in acid

4. Electrolysis of a compound E.g. dilute H2SO4

5. Fermentation and decay of substances e.g Alcohol, Yoghurts

6. Slaking of lime i.e adding water to quicklime

7. Changes in an electrochemical cell.

Differences between Physical and Chemical Changes:

Physical ChangeChemical Change
1Easily reversibleNot easily reversible
2No new substances are formedNew substances are formed
3No change in massThere is a noticeable change in mass
4Not accompanied by a great heat changeUsually accompanied by great heat change
back-to-top
error: