Question

12. Why is cutting of vegetables a physical change, while cooking of vegetables is a chemical
change?
13. What are exothermic changes?​

Answer 1

Answer:

Q12.

Answer- It is so because while cutting we just cut vegetables into pieces and though it's physical shape and size change its chemical composition remains the same but while cooking of food we add masalas ,water and many other things which change both the physical state and chemical composition so it is a chemical change .

Q13.

Answer-An exothermic reaction is a "reaction for which the overall standard enthalpy change ΔH⚬ is negative." Exothermic reactions usually release heat and entail the replacement of weak bonds with stronger ones.

Hope it helps .

Explanation:

Answer 2

Answer:

AS PHYSICAL CHANGES ARE IRREVERSIBLE & HERE CUTTING OF VEGETABLES IS IRREVERSIBLE AS WE CANNOT REVERSE THIS PROCESS THEREFORE CUTTING OF VEGETABLE IS A PHYSICAL CHANGE ..

WHILE THE COOKING OF VEGETABLE IS A CHEMICAL CHANGE BECAUSE ,

its chemical composition remains the same but while cooking of food we add masalas ,water and many other things which change both the physical state and chemical composition so it is a chemical change .

Exothermic changes means the reaction in which heat is evolved which changes the temperature of its surroundings.