Question

Birla public school
Change around us
Q1) A bowl of dough and A roll out routine is a physical change ?
Q2) Making of paper aeroplane from a paper is it a chemical change. Why ?
Q3) Burning of a candle is chemical change or physical change or both. How?
Q4) I think coating of a plaster from plaster of Paris is applied over the bandage on a fracture bone. it becomes hard on drying to keep the fracture bone immobilised . can the changes in reversed?
Q5) A bag of cement lying in the open get where due to rain during the night the next day the sun shines bright. Do you think the changes,which you have occurred in the cement can be reversed?

Answer 1

1 = true
2 = no,because it doesn’t change its chemical composition