heat transfer physical change law of conservation of mass law of conservation of energy
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: A substance with a mass of 10 g is heated to produce two new substances. The mass of the first new substance is 9.3 g and the mass of the second new substance is 0.7 g. Which of the following is best demonstrated by this example?
Possibilities:
- heat transfer
- physical change
- law of conservation of mass
- law of conservation of energy

law of conservation of mass