False, they are all different because they help you know different things.
During the Physical changes
I think you forgot to attach a picture
5. 1 hydrogen, 1 Nitrogen, 3 oxygen
H2O is the chemical formula of water. It means that each molecule of water is made up of two hydrogen atoms, indicated by the letter H, and a single oxygen atom, represented by the O. Water is a chemical substance with no smell, taste, or color.
