If matter were destroyed, then it would not be conserved. "Conservation" means that the amount of mass doesn't change.
The law of conservation of mass/matter states that mass/matter cannot be created or destroyed in chemical or physical changes.
The best example of the law of conservation of matter is complete combustion. If you were to burn something of known mass in a closed system, the system would have the same mass before and after combustion occurs.
Law of Conservation of mass(atomic mass). As mass can be considered relative to energy, therefore Law of Conservation is also correct but Law of conservation of mass is is much more accurate because here mass is a much more accurate term that is required here. Here, since, we are balancing molecules, then we require atomic or molecular mass.
In both cases, something is conserved - it doesn't change over time.Also, mass and energy are equivalent. If something has energy, it has mass, and vice versa.
The mass of reactants is equal to the mass of products.
The law of conservation of mass/matter states that mass/matter cannot be created or destroyed in chemical or physical changes.
The law of conservation of mass, which states that in a closed system, mass is neither created nor destroyed, it can only change form. This means that in a chemical reaction that takes place in a closed system, the mass of the reactants equals the mass of the products.
A citation from Wikipedia:"The law of conservation of mass, also known as principle of mass/matter conservation is that the mass of a closed system (in the sense of a completely isolated system) will remain constant over time."For more details see the link bellow.
The best example of the law of conservation of matter is complete combustion. If you were to burn something of known mass in a closed system, the system would have the same mass before and after combustion occurs.
During chemical processes in a closed system the mass remain constant.
It may also be known as the law conservation of mass; and it states that the total mass of materials present after a chemical reaction is the same as the total mass before the reaction. This law is the basis for Dalton's postulate 3.
Answer the question...
Dalton's 2nd atomic theory law is that matter cannot be created nor destroyed. But consider the burning of a coal in oxygen, it appears that matter has been destroyed bcoz de mass of ash obtained at de end of burning is far less than the mass of coal and oxygen b4 burning. Eistein derived an expression 2 de interconversion of matter nd energy gven by E=mc(square), wia c is de velocity of light nd E energy and m is de mass. The theory has now been put in the form of law called de LAW OF CONSERVATION OF MASS or de law of indestructibility of matter. THE LAW OF CONSERVATION OF MASS STATES THAT MATTER CAN NIETHER BE CREATED NOR DESTROYED IN THE COURSE OF CHEMICAL REACTION.
There is the law of conservation of mass, and the law of conservation of energy. All three state: (Mass/Matter/Energy) cannot be created or destroyed, simply transferred.
the law of conservation of matter (or mass)
Chemical processes do not create or destroy mass, a principle known as conservation of mass.
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.