Thermochemistry

Thermochemistry: When a chemical reaction occurs, energy, in the form of heat is either released or absorbed by the reaction (studying energy involved in chemical reactions)

Energy:

• A measure of the abitlity of an object or system to work on another object or system

SI units = J = (kgm^2)/s^2

Another common unit: calorie (food) -→ 1 cal = 4.184 J

Energy types:

• Kinetic Energy
  • heat
• Potential Energy
  • elastic
  • gravitational
  • chemical
  • electrical/magnetic
• Solar Energy
  • the ultimate source of Energy on Earth comes from the Sun
• Mechanical Energy
  • Em = Ep + Ek

Law of Conservation of Energy

• All energy in the universe is constant
  • Change in Energy of Universe = 0

Energy cannot be created or destroyed, it can change forms or be transferred.