The physical or chemical form of matter can be changed.
Mattermattermatter
The conservation of matter.
If matter were destroyed, then it would not be conserved. "Conservation" means that the amount of mass doesn't change.
Law of Conservation of Mass
Matter
You are confusing the law of conservation of matter/mass with the law of conservation of energy. The law of conservation of matter/mass states that in a closed system matter is neither created nor destroyed. During a chemical reaction matter is rearranged, it doesn't change forms (energy can change forms). The atoms in the products are the same atoms that were in the reactants.
Law of Conservation of Matter.
mass cannot change quanity if it is not added or removed
The Conservation of Matter and the Conservation of Momentum are the consequence of the Conservation of Energy.
Matter
Matter
matter