Revision of material changes

05.06.2020
07:34:31
Dear students, good morning
Today's revision topic : material changes
Pg.no : 108 to 110
The important points are
1.physical change :
* No new substance formed
* Reversible or irreversible reaction
* Temporary change
Example : melting of water and chocolate
Boiling of water etc
2 , chemical change :
* New substance are formed
* Irreversible reaction
* Permanent change
Example : burning of coal , rusting , curdling of milk etc..
For better understanding of concepts watch the below videos