This preview shows page 1. Sign up to view the full content.
Lecture outline for Friday, September 28, 2007 (Chem 100, section 2) a. Energy and Bond Making b. The Practical Science of Thermodynamics Developed in mid 1800’s (Mechanical design of Engines & Heat Pumps. No Perpetual motion machines.) Applied to Chemistry (J. Willard Gibbs; Which reactions will be spontaneous? Chemical efficiency?) c. Central Role of Energy in Thermodynamics Energy units are Joules (J = kg m 2 s –2 ). Energy transfer (work) = Force(N) × Distance(m) d. Energy categories • Kinetic: motion; Potential: everything else e. Chemists study Internal Energy. Internal Energy is an Entensive State Function State functions of substances or mixtures • are quantities (numbers with units) • measurable or derivable from measurements • values always the same for “same” chemical state • values are usually different for different states Extensive ( ∝ how much) vs. Intensive f. Kinetic Energy (energy of motion): E kin = 1 / 2 mv 2 : g. Potential Energy (stored energy): Gravitational, Spring, Electrical, Chemical Bond Energy
This is the end of the preview. Sign up to access the rest of the document.
This note was uploaded on 04/07/2008 for the course CHEM 100 taught by Professor Scarrow during the Fall '07 term at Haverford.
- Fall '07