Why is the total mass always conserved in a chemical reaction? be sure that your explanation includes the discussion of atoms and bonds.

Conservation of mass means that mass can not be created and even destroyed. This hold true with energy. During a chemical reaction, atoms were never created during the process. Also, during the process they were not destroyed. Atoms just change in form, connect to a different configuration or made into smaller or larger molecules but never created or destroyed. 

Answer) by studying proton collisions hope this : )

Ibelieve y y even though i've only taken chemistry for one year