CHY 103 Lecture Notes - Lecture 9: Thermal Energy, Thermodynamics, Enthalpy
Document Summary
Before we begin our study of thermochemistry we should review some basic physics terms. Mechanical: energy of motion for macroscale objects, e. g. , baseball. Thermal energy: energy of motion for nanoscale objects, e. g. , atoms, molecules, ions. Electrical: energy of motion of electrons through a conductor. Gravitational: energy an object has by virtue of its position in a gravitational field. Electrostatic: energy charged particles have because of their attraction or repulsion of each other. Chemical: energy resulting from attractions and repulsions among electrons and atomic nuclei in molecules. The standard unit of energy is the ____________, represented by j. One joule does represent very much energy, and so kilojoules (kj) is often used. Another common unit is the ____________ (cal) which was originally defined as the amount of energy required to raise the temperature of 1 g of water by 1 c but is now defined in terms of joules.
