Question

1. give an example of physical change that cannot be reversed?
2. what kind of change is object when Copper utensil appear to be greenish in colour ?







please give me the correct answer I give you 1000000 points ​

Answer 1

Answer 1

Egg being cracked or wood being ground into sawdust. ... For example, you cannot unbake a cake or unburn wood.

Answer 2

When a copper utensil is exposed to air or comes in contact with the same, a reaction takes place between copper,and gases and moisture present in the air which results in the formation of a mixture of copper compounds which imparts a green colour to the surface of the metal.