THERMOCHEMISTRY
Energy, Heat and Units of Energy
Thermochemistry or energetics deals with the energy changes that accompany physical and chemical processes.
Energy
• Energy is what we use when we perform work or other activities.
• It can exist in different forms such as heat, electricity, kinetic (to cause motion), potential (due to position or chemical composition of a substance) etc.
• Example of a KE is a car in motion and that of PE includes a boulder rolling down a hill or a city water tank on top of a platform
• We use energy when we walk, talk, climb, run, think, exercise emotions, eat, think etc
• When we are tired, it indicates that we do not have enough energy in our system to do any work
• Sources of energy: varies but includes the food we eat, fossils, fuel etc
• Energy can be converted from one form to another (Law of conservation of energy)