To support his claim, Lavoisier decomposed water into oxygen and inflammable air. The Law of Conservation of Mass dates from Antoine Lavoisier's discovery that mass is neither created nor destroyed in chemical reactions.
In other words, the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction. Atoms can be combined with other atoms to form molecules. Matter is anything that has mass and takes up space. Matter can change form through physical and chemical changes, but through any of these changes, matter is conserved. The same amount of matter exists before and after the change—none is created or destroyed.
Matter can neither be created nor destroyed. This is the law of conservation of matter mass. The amount of water matter stayed the same, but the volume just changed a bit.
We are really using the Law of Conservation of Mass-Energy. No, matter is not created or destroyed. However atoms can change the composition of their sub atomic particles. If a atom of uranium is ' split ' it will lose neutrons from the molecule, but they aren't destroyed. We now understand why matter is conserved -- atoms are neither created nor destroyed in a chemical reaction.
Hydrogen atoms in a H 2 molecule can combine with oxygen atoms in an O 2 molecule to form H 2 O, for example. But the number of hydrogen and oxygen atoms before and after the reaction is the same. The total mass of the products of a reaction therefore must be the same as the total mass of the reactants. Furthermore notice how apt Lavoisier's new names are: "Oxygen" makes acid his new theory ; "Azote" without life, does not support respiration ; "Hydrogen" creates water upon oxidation.
His theory had trouble with the root or radical, or base of the acid of sea salt, muriatic acid. The following table named the "compound radicals" , the bases combining several elements which upon oxidation would yield complex acids.
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