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Unformatted text preview: 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. = 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...
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