What is a chemical change and give example?

Answer 1

During a chemical change the molecules of reactants are transformed in molecules of products.
Example: burning of methane gas in a burner.

Answer 2

A chemical change is a process that results in the formation of new substances with different chemical properties. For example, when iron rusts, it undergoes a chemical change as it reacts with oxygen to form iron oxide, a new substance with different properties than pure iron.

Answer 3

A chemical change is something that permanently alters the substance. It cannot be reversed.

For example, frying an egg

Answer 4

Burning of coal is good example .