Physical and Chemical changes

Physical changes is a change only appearance of a substances. Changes in appearance include change in texture, shape, and size. A physical changes may or may not involve a change in state. No new materials are form in physical change. The example of physical change.


*Inflating the balloon  :         

  When we blow air into a balloon, its shape and size change. The material use to make the balloon does not change. It is still made from rubber. No new materials are formed.

 *Breaking glass: 

 When a drinking glass breaks, it turns into smaller pieces. Its shape and size is change. The material used to to make the drinking glass does not change. It is still made from the glass. No new materials are formed.

*Crumpled paper:


When you crumpled a paper, the form and size must also change to the original that you get.






Now we are going to go with the Chemical changes.
Chemical changes is one that involve a chemical reaction. New materials are formed in chemical changes. The color,odour, shape or structure is also change. The new materials formed cannot be changed back into the original formed. I have some examples that shows chemical changes such as:


*Baking a cake:


When we bake a cake we always need the ingredients that we need, for example flour, eggs, milk and other. Then, we mix them all together and it will become a cake, means when we bake a cake, we need so many new materials to mix.


*Burning candles:


Candle is source of light and heat, if it's cold or black out. It consist of solid, black of fuel, which made of wax, and a wick. Like wood, wax is mainly made up of carbon.






*Reaction of vinegar with bicarbonate of soda:


Bicarbonate of soda is a white powder that is used in baking. Vinegar is a colorless and weak acid that is used as a flavouring in cooking.










So if you want to do/test if it's true or not, such as the experiment above, you can try!