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Chapter_19 - Ch 19 Heat and First Law of Thermodynamics...

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Ch 19: Heat and First Law of Thermodynamics 1) Heat Q is a form of energy– in calories: J 186 . 4 cal 1 = Focus: Heat and Work 2) Internal energy U : ( ) RT n T Nk m N U B 2 3 2 3 2 2 1 v = = = 4) Calorimetry: 3) Specific heat c : T mc = Q Heat input to raise temperature by D T=T f -T i m = mass in kg c in kcal/kg/ o C * Note Q < 0 means heat output . Heat gain = Heat loss Q cold = - Q hot T f > T i cold T f < T i hot Gains heat Loses heat (monatomic gas)
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