Question

Why does mass not change during a chemical reaction

Answer 1



Atoms are not created or destroyed in a chemical reaction, they are just rearranged from the reactants to form the products. ... But, if the chemical reaction happens in an open system (where air can get in and out), thenmass may appear to change

Answer 2

In a chemical change, the molecules in the reactants interact to form new substances. In a physical change, like a state change or dissolving, no new substance is formed. Explain that another way to say that no atoms are created or destroyed in a chemical reaction is to say, “Mass is conserved.”