Asha 's mother asked her daughter Asha to boil the milk and after some time , she told Usha , Asha 's sister to add little curd in the same luke warm milk . Nextday, their father while teaching"Transformation of matter " to his daughters wanted to relate the given activity . so he asked them - " what type of changewas involved in the activities performed by you yesterday ?" Predict the answer given by them and justify.

Asha 's mother asked her daughter Asha to boil the milk and after some

1.	Asha 's mother asked her daughter Asha to boil the milk and after some time , she told Usha , Asha 's sister to add little curd in the same luke warm milk . Nextday, their father while teaching"Transformation of matter " to his daughters wanted to relate the given activity . so he asked them - " what type of changewas involved in the activities performed by you yesterday ?" Predict the answer given by them and justify.
Answer» Solution :During boiling of milk , the FAT PARTICLES being lighter than water RISE up when some amount of water vaporises . Thislayer of fat becomes thick and forms a COATING over milk is a physical change . Curdling of milk invloves partial conversion of lactose sugar into lactic acid . Since there is change in molecular composition , curdling of milk is a chemical change.