Question

How does the Law of Conservation of Mass relate to changes in physical state? How does it relate to chemical changes?

Answer 1

The law of conversation of mass states that you cant create or destroy matter.By applying these to chemical changes, it implies that the left hand side of the reaction must balance with the right hand side of the reaction equation as you can neither create nor destroy atoms. this gives us a powerful tool to predict chemical reactions and the overall stoichiometrey
 of chemical reactions