lec2 - Announcements Lab starts Monday ! Discussion has...

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1 Announcements • Lab starts Monday !!! • Discussion has also already started !!! • CR0 section see head TA Afram after class • drop + re–add = disaster • Head TA office hours: W 11–12 Chem 159 Last Time • First Law of Thermodynamics Δ U = q + w – heat emitted q heat + heat absorbed – work delivered w work + work accepted • Know q and w calculate Δ U Heat q • Unit of heat: calorie – 1 cal = amount of energy required to heat 1 g of H 2 O by 1 ° C • Standard S.I. Unit: Joule – 1 cal = 4.184 J • Different materials heat differently
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2 Basis for Comparison • Heat capacity = heat supplied / temp. rise c p = • Officially: heat required to raise T by 1 ° C • Units: J / ° C or J / K • Poor measure: Extensive property q Δ T Better Estimates • Molar heat Capacity: C p C p = • Specific heat Capacity: C sp C sp = • Both C p and C sp are intensive properties q n Δ T q m Δ T J mol ° C J g ° C Uses of C p and C sp •C p and C sp are tabulated – calculate heat q = nC p Δ T= mC sp Δ T
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This note was uploaded on 04/23/2008 for the course CHEM 2B taught by Professor Clemens during the Winter '08 term at UC Davis.

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lec2 - Announcements Lab starts Monday ! Discussion has...

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