Question

Samantha is explaining the following to her friend- 1. if 2 reactants undergo a chemical reaction then the mass of the product is not the same as the mass of the reactants as some of the products evaporate in the chemical reaction so the mass changes. 2. If she will procure a compound from different sources then the same compound will have different composition. Explain what Samantha is talking about and identify and state if she is correct.

Answer 1

Answer:

ANSWER

According to the law of conservation of mass, matter can neither be created nor destroyed, so the total quantity of matter, i.e., the total mass, before and after a change, remains the same. So, the mass of the substances, taken together, before and after a chemical change, will also remain same. From this, it can be concluded that any new substance formed during a chemical change is due to the rearrangement of the atoms of the original substance. The number of atoms of each kind remains the same, before and after the chemical change.