Briefly describe each of the following ideas or methods: (a) law of conservation of energy; (b) bomb calorimetry; (c) function of state; (d) enthalpy diagram; (e) Hess's law.

a) Law of conservation of energy: energy cannot be created or destroyed but only changed from one form to another. b) Bomb Calorimetry: A method where a reaction is carried out inside a sealed bomb with known volume and the heat of the reaction is determined by observing the temperature change of water surrounding the bomb. c) Function of state: A property of a system that depends only on the current state, not the path taken to get to that state. d) Enthalpy Diagram: A graph that shows energy levels of reactants and products in a chemical reaction and the energy difference represents the enthalpy change. e) Hess's law: The total enthalpy change in a reaction is the same, irrespective of the number of steps in that reaction.