Chapter+5 - 1 Thermochemistry Thermodynamics Study of...

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1 Thermochemistry Thermodynamics ˚ Study of energy and its transformations First law of thermodynamics ˚ Energy (of the universe) can neither be created nor destroyed Terms ˚ System ˚ Surroundings 2 Energy Capacity to do work or transfer heat ˚ Kinetic KE=(1/2)mv 2 ˚ Potential Stored energy Properties ˚ Extensive(depends on the amount of material) ˚ State Function 3 Internal Energy E = PE + KE E = q + w ˚ q is heat ˚ w is work = force x distance or –PV for a gas ˚ E = q - P V at constant pressure or q p = E + P V
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4 Energy Units Joule ˚ 1 J = 1 kg-m 2 /s 2 KE=(1/2)mv 2 =1/2(2 Kg)(1 m/s) 2 = 1 J ˚ 1 cal = 4.184 J Old cal= amount of energy to raise the temperature of 1 g of water from 14.5 o C to 15.5 o C Cal(large calorie)= 1 Kcal 5 Enthalpy, H H = H final -H initial = heat gained or lost by the system when a process occurs under constant pressure, q p ˚ Endothermic - H > 0 ˚ Exothermic -
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Chapter+5 - 1 Thermochemistry Thermodynamics Study of...

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