2/26/09 11:27 AM Energy is the ablility to do work Law of conservation of energy 1st law of thermodynamics energy cannot be created nor destroyed, but can be converted from one form to another Types of Energy Kinetic Energy (kE, Ek) energy of motion Ek=1/2 mv^2 where m=mass and v=velocity Translational, vibrational, rotational Thermal energy of gasses (Ch. 10) Potential Energy (PE, U) Energy of composition or position Gravitational PE = Ug=mah m = mass a = 9.8m/s^2 h = height Elastic PE Elastic = 1/2Kx^2 K = constent X = displacement from equilibrium position Rest mass Energy (E=mc^2) Chemical Energy Breaking or forming chemical bonds Heat energy Transfer is associated with the different motions of matter. Flows rom a body of higher temp to one at a lower temp when placed in thermal contact Units of Heat Energy Joule(J)=SI unit of energy calorie(cal)=4.184J Calorie = 1000cal = 1kcal 4.184J in 1cal 1000cal in 1Cal Calorimetry Measurement of heat flow performed with a calorimeter Heat = specific heat * mass of sample * DT Q=Csp*m*DT Chem 113 ? Chapter 5 intro 2/26/09 11:27 AM 2/26/09 11:27 AM
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