Why do you have to strike a match to start a fire burning? Why do some chemical reactions give off heat while other reactions absorb heat? Thermochemistry investigates energy and its relation to chemical reactions and processes. As you study Thermochemistry, you will learn how different forms of energy apply to Chemistry, such as Transferring Heat Energy: Exothermic and Endothermic and the Definition of Catalyst. You will learn about laws of energy that are important to the study of Thermochemistry: 1st Law: Conservation of Energy and 2nd Law: Entropy. After learning the laws of chemistry, you can slide across the spectrum and learn how calories affect the body in Units of Energy: Calorie and Joule. Did you know that Calories measure the energy in food? You will learn that and so much more in this fascinating topic!