CHEM 1061 Chapter Notes - Chapter 6: Heat Capacity, Potential Energy, Exothermic Process
Document Summary
Potential energy is converted to kinetic energy. System: the part of the universe focused on. Sum of potential and kinetic energies of the system is called internal energy, e. Change in e is the difference between the internal energy after the change and the internal energy before the change. A change in the energy of a system must be accompanied by an equal and opposite change in the energy of the surroundings. Heat: thermal energy is the energy transferred as a result of a difference in temperature between the system and surroundings. Work: all other forms of energy transfer involve some type of work. Energy transferred into the system is positive because the system ends up with more energy. Energy transferred out from the system is negative because the system ends up with more energy. Enthalpy: a thermodynamic variable that relates directly to energy changes at constant pressure. A change in enthalpy ( h = e + p v)