How does the Law of Conservation of Mass (Matter) apply to physical and chemical changes?

The way matter behaves folows the Law of Conservation of Matter. That is during a chemical change, there is no detectable increase or decrease in the quantity of matter. For example, when calcium is exposed to dry air,it unites \with oxygen . So if you weigh the calcium oxide produced, it will have a greater mass than the original piece of metal. But...


if you consider the mass of oxygen in the air with the metal, then your final mass will be equal to the mass of calcium and oxygen.





With a physical change, there is a change in one or more properties but no change in the chemical composition of the stuff involved. So a physical change does not involve a change of one kind of matter into another.For example, water if solid liquid or gas still has the same chemical compositionHow does the Law of Conservation of Mass (Matter) apply to physical and chemical changes?
when u have a chemical change it losses mass,so then u loss it

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