Question

Question:
What is chemical change ?
Give reason. and Why? ​

Answer 1

Answer:

Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.

Answer 2

Answer:

change in the composition or properties of a substance can be called as chemical change . we can determine that chemical change has been occur by seeing

change in colour

release of gas

change in temperature

most common example can be rusting of iron .