L18S08 IdealGases_Compressibility

L18S08 IdealGases_Compressibility - Chem1A L20:...

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Unformatted text preview: Chem1A L20: "Ideal Gases,Compressibility, Abs. Temp." Molecular Orbitals: Polyatomics Orbitals: C sp Summary 2 180 3 120 Steric Number Bond Angle Hybridization C sp2 sp3 L18-14 C UC Regents 4 109 2001 A.Pines,M.Kubinec,UCB L18-1 ChemQuiz 17.4 Which molecular orbital in benzene formed from the atomic orbitals shown has the highest energy? energy? A) B) C) L18-2 2001 A.Pines,M.Kubinec,UCB Previously 2001 A.Pines,M.Kubinec,UCB L18-4 A.Pines,M.Kubinec,UCB 1 Chem1A L20: "Ideal Gases,Compressibility, Abs. Temp." d-Orbital Hybridization Shape SN: 5 Hybrids Orbitals 90 90 Examples dsp3 trigonal bipyramidal 120 120 :I F F F F S F F F .. F F Xe F F .. F L18-5 : F SN: 6 d2sp3 d sp octahedral 2001 A.Pines,M.Kubinec,UCB 90 90 90 90 dsp3 Orbitals to Form bonds in PCl5 Molecule dsp3 Trigonal bypyramidal : :I F F 2001 A.Pines,M.Kubinec,UCB F L18-6 Ideal Gas, Boyle, Constant T P Isothermal Compression, Expansion P C Summary PV=const PV= T2 T1 P const P= V T2 Compressibility =- 1 V V P B A C A B A L19-6 T1 V A.Pines,M.Kubinec,UCB V L14-2 UC Regents 1 A V Effect of T, Charles, Gay-Lussac GayV PV=nRT piV=niRT Gas 2 Gas 1 The Constants and Variables PV=nRT PV=nRT PV=nRT PV=nRT V=nRT PV=nR P = pressure in atmospheres Vm(STP)=22.4L V = volume in liters n = number of moles R = 0.08206 atm L K-1 mol-1 (8.314 J K-1 mol-1) T = absolute temperature in Kelvins UC Regents L19-10 T(K) = T(C ) + 273.15 STP = 1 atm, 273 K atm, T L14-5 A.Pines,M.Kubinec,UCB A.Pines,M.Kubinec,UCB 2 Chem1A L20: "Ideal Gases,Compressibility, Abs. Temp." Torecellian Barometer Pressure = force/area 1 standard atmosphere = 1 atm = 760 mm Hg = 760 torr = 101,325 Pa 2001 A.Pines,M.Kubinec,UCB L18-8 Ideal Gas, Boyle, Constant T P C PV=const PV= P const P= V T1 B A T1 V 2001 A.Pines,M.Kubinec,UCB V L18-9 1 Ideal Gas, Boyle, Constant T P PV=const PV= T2 T1 P const P= V T2 T1 1 V 2001 A.Pines,M.Kubinec,UCB V L18-10 A.Pines,M.Kubinec,UCB 3 Chem1A L20: "Ideal Gases,Compressibility, Abs. Temp." Isothermal Compression, Expansion P C B A A C A B A L18-11 Compressibility =- 1 V V V P V 2001 A.Pines,M.Kubinec,UCB ChemQuiz 18.1 Diving Which isothermal ascent poses the gravest danger if breath is held? A) 10m 0m 2001 A.Pines,M.Kubinec,UCB 0m 1 atm 10 m 2 atm B) 20m 10m C) 50m 30m L18-12 Effect of T, Charles, Gay-Lussac GayV PV=nRT piV=niRT Gas 2 Gas 1 T(K) = T(C ) + 273.15 T( STP = 1 atm, 273 K atm, T L18-14 2001 A.Pines,M.Kubinec,UCB A.Pines,M.Kubinec,UCB 4 Chem1A L20: "Ideal Gases,Compressibility, Abs. Temp." The Constants and Variables PV=nR PV=nRT PV=nRT PV=nRT PV=nRT V=nRT P = pressure in atmospheres Vm(STP)=22.4L V = volume in liters n = number of moles R = 0.08206 atm L K-1 mol-1 (8.314 J K-1 mol-1) T = absolute temperature in Kelvins 2001 A.Pines,M.Kubinec,UCB L18-15 Examples of T (K), Approach to Absolute Zero Sun Interior Sun Surface W Melt Point ~108 LN2 Boil Point ~104 LH2 Boil Point ~103 LHe Boil Point ~77 ~20 ~4 H2O Boil Point ~373 Dilution Fridge ~10-3 H2O Melt Point ~273 Laser Cooling ~10-6 CO2 Sublime Point ~195 Spin Temperature ~10-9 2001 A.Pines,M.Kubinec,UCB L18-16 ChemQuiz 18.2 An ideal gas in a 1 L balloon is heated from 100C to 200C 100 200 at 1 atm. What is the final atm. volume of the balloon? balloon? A) < 2 L 2001 A.Pines,M.Kubinec,UCB 1L 1 atm 100C 100 B) 2 L C) > 2 L L18-17 A.Pines,M.Kubinec,UCB 5 Chem1A L20: "Ideal Gases,Compressibility, Abs. Temp." ChemQuiz 18.3 CH4 (g) + 2 O2 (g) CO2 (g) + 2 H2O (g) A mixture of 1.0 atm of CH4, and 2.0 atm O2 react in a 1 L flask at constant high T. What happens to the total pressure ? 1A) increases 2001 A.Pines,M.Kubinec,UCB CH4 O2 B) same C) decreases L18-19 ChemQuiz 18.4 atoms occupies ~22 L One mole of sulfur ~22 L ~0.25 atm ~546 K at 0.25 atm, 546 K. atm, K. What is the molecular formula of the sulfur? sulfur? B) S2 A) S 2001 A.Pines,M.Kubinec,UCB C) S8 L18-21 Lecture Complete 2001 A.Pines,M.Kubinec,UCB L18-23 A.Pines,M.Kubinec,UCB 6 ...
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