JSS 2: CHANGES IN MATTER

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Matter is anything that has mass and occupies space. Examples of matter include; Air, water, rocks, plants, animals, and even people. 
Matter is made up of one or more of the following: atoms, molecules, and ions. 
                STATES OF MATTER  
Matter exists in three different major states which are 
1. Solid state 
2. Liquid state  
3. Gaseous state 
            
                  CHANGES IN MATTER 
Changes in matter can be categorized into two namely,
1. Physical change 
2. Chemical change 
                       Physical changes 
A physical change is a change that can be easily reversed and no new substances are formed.
Examples of physical changes are 
1. Melting of solid to liquid 
2. Freezing of liquid to solid 
3. Vaporization of liquid to gas 
4. Liquefaction of gas to liquid 
5. Sublimation of solid to vapor 
6. Magnetization and demagnetization of iron rods etc.
                   Chemical changes 
A chemical change is a change that cannot be easily reversed and new substances are formed.
Examples of chemical changes are 
1. Rusting of iron 
2. Addition of water to quick lime(CaO) I.e. Slaking of lime
3. Dissolution of metals in acids
4. Dissolution of limestone in acids 
5. Fermentation of substances 
6. Burning of substances 
7. Changes in an electrochemical cell etc.

DIFFERENCES BETWEEN PHYSICAL AND CHEMICAL CHANGES 

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