1. Law of Conservation of Mass: Matter is neither created nor destroyed in a chemical reaction.

2. Law of Conservation of Energy: Energy can neither be created nor destroyed, but it can be converted from one form to another.

3. Law of Definite Proportions: A given compound always contains the same elements combined in the same proportions by mass.

4. Law of Multiple Proportions: When two elements form more than one compound, the masses of one element that combine with a fixed mass of the other element are in a ratio of small whole numbers.

5. Avogadro's Law: Equal volumes of all gases, at the same temperature and pressure, contain an equal number of molecules.

6. Charles' Law: The volume of a gas is directly proportional to its absolute temperature when pressure is held constant.

7. Gay-Lussac's Law: The pressure exerted by a given quantity of gas is directly proportional to its absolute temperature when volume is held constant.