Chemistry 008 Handout #3 Mrs. Harriet Smithline Spring 2005 Chapter 12 Review Guide (Lectures 1/25/05 and 1/27/05) Chemical Energetics I. Thermodynamics A. Will a rxn happen? Will it go to completion? Where will it stop? B. 3 types of energy (units of joules) 1. kinetic E k = 1/2 mv 2 2. potential 3. thermal E th = C tot T where C tot is the heat capacity ( J/K) E th = nC T where C is the molar heat capacity (J/mol . K) and n = moles = mass/Molar Mass C. First Law of Thermodynamics (3 ways to express) energy cannot be created or destroyed or total energy of the universe is constant or ∆ E universe = 0 in any process ( ∆ means final – initial) D. Universe = system + surroundings 1. Look at transfer across system/surroundings barrier 2. 2 main types of transfer a. Heat (q) energy transferred thermally ( if q >0 energy transferred into system ; expect temperature increase) b. Work (w) energy transferred by a force ( if w >0 work done on the system) II. Calculations A. ∆ E sys = q
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