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Ch.7 Notes - Chapter 7 Thermochemistry CH4(g 2O2(g CO2(g...

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Chapter 7 Thermochemistry CH 4 (g) + 2O 2 (g) CO 2 (g) + 2H 2 O(g) + energy Source of energy (802 kJ) heat, light, mechanical work, electrical energy Chemical Energy ----> heat, light, work, etc (reactant bonds) Thermochemistry – study of heat changes accompanying chemical and physical processes Other examples: HCl(aq) + NaOH(aq) NaCl(aq) + H 2 O(l) + heat 2H 2 (g) + O 2 (g) 2H 2 O(g) + heat MgSO 4 (s) + H 2 O(l) MgSO 4 (aq) + heat [hot pack] Heat + NH 4 NO 3 (s) + H 2 O(l) NH 4 NO 3 (aq) [cold pack] Energy(light) + 6CO 2 (g) + 6H 2 O(l) C 6 H 12 O 6 (s) [photosynthesis] Law of Conservation of Energy (first law of thermodynamics) – Energy is not created or destroyed in chemical reactions, it can be converted Energy and Units Energy – capacity to do work Kinetic Energy – energy associated with the motion of an object K.E. = ½ MV 2 (SI UNITS: Joules, kg, m/s) Potential Energy- sum of the kinetic energy and potential energy of the particles making upo a substance Units: calorie- heat required to raise the temperature of one gram of water one degree Celsius (from 14.5 to 15.5 o C) 1 kilocalorie – 1 kcal = 1000 cal
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