Nov_02 - Chapter 12 Heat, Work, and Energy Coffee Types of...

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Chapter 12 Heat, Work, and Energy
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Coffee
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Types of systems
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Heat and Temperature heat : an amount of energy transferred due to a temperature difference temperature : a reflection of the average kinetic energy in a system not the total energy q = C T C = heat capacity of system C depends on the the type and amount of substance(s) in the system
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Heat Capacity - example How much heat is transferred when 50 g of water is cooled from 55 ºC to 53 º C ? [molar heat capacity of water = 75.4 J mol -1 K -1 ] no .of mole of water = 50 / 18 = 2.78 mol q = n C T Δ q = 2.78 (75.4) (53 - 55) = - 420 J Note: negative sign means heat was lost
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Work Pressure-volume work (w) is calculated using: w = - P ex V P ex - external P against which system is working V - change in volume If V increases work is -ve, i.e, system loses energy by doing work. Note P V is equivalent to F d
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Internal Energy Internal energy (E or sometimes U) is the total energy in a system , both kinetic (motion) and potential (bonds) It is changed by the exchange of heat (q) or work (w) with the surroundings .
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Nov_02 - Chapter 12 Heat, Work, and Energy Coffee Types of...

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