Which of these statements best describes the law of conservation of mass a) when a physical or a chemical change occurs, matter is not created or destroyed b) when a physical or a chemical change occurs, matter is created but not destroyed c) when a physical or a chemical change occurs, matter can be created and destroyed d) when a physical or a chemical change occurs, matter can be created but not destroyed

The statement which best describes the law of conservation of mass is A) when a physical or a chemical change occurs, matter is not created or destroyed. The law states that matter cannot be created or destroyed by ordinary chemical or physical changes, which means that the mass of all the components of a chemical reaction can be measured before and after the change in order prove that the mass is constant. So, keep in mind that the mass of participating products is always the same as the mass of all the reactants.

What do you mean by that? like the contents? the thc level?