Question

Give reasons :--
i) Curdling of milk is a chemical change.
ii) Rotation of fan is a periodic change
. Iii ) Burning of cooking gas is a fast change.​

Answer 1

Answer:

1 . IT IS A CHEMICAL CHANGE BECAUSE AFTER CONVERTING INTO CURD IT WILL NOT CHANGE INTO MILK

2. IT IS A PERIODIC CHANGE BECAUSE IT MOVE PERIOD BY PERIOD...

3. BURNING OF COOKING GAS IS A FAST CHANGE BECAUSE HEATING AND STEEL IS GOOD CONDUCTOR OF ELECTRICITY