L02S10_AtomicStruc+01-22-10 (1)

L02S10_AtomicStruc+01-22-10 (1) - L2 Chem 1A: "Atomic...

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Unformatted text preview: L2 Chem 1A: "Atomic Stucture, Mass Spectra" Chemical Reactions Summary 2H2 Energy Reactants Products Reaction Coordinate © 2001 UC Regents + O2 2H2O High Road (barrier) L1-4 Relative Atomic and Molecular Mass H 1.01 12C 2H2 + O2 2H2O Al 26.98 P 30.97 Fe 55.85 Pb 207.2 H2 2.02 O2 32.00 H2O 18.02 CO2 44.01 12.00 C 12.01 O 16.00 2 molecules + 1 molecule 2 moles + 1 mole 2 grams + 16 grams 2 molecules 2 moles 18 grams L2-1 © 2010 Pines,Kubinec, Nitsche UCB Stoichiometry Relationships between quantities of matter that participate in chemical reactions. 2H2 Energy + O2 2H2O Transition State High Road (barrier) Low Road (catalyst) Reactants Products Reaction Coordinate © 2010 Pines,Kubinec, Nitsche UCB L2-2 ChemQuiz© 2.1 After the reaction of 1 mole H2 and 2 moles O2 which species has the greatest number of moles? A) H2 © 2010 Pines,Kubinec, Nitsche UCB B) O2 C) H2O L2-3 ©2010 Pines,Kubinec,Nitsche, UCB 1 L2 Chem 1A: "Atomic Stucture, Mass Spectra" Mass Spectrometer Ionization - N Magnet Mass Spectrum Sample Acceleration S 1 H 2H 2, 1H 12C 16 O 13C 16O 2 1H 16O 18O 2 , 16O18O 12C16O 2 1H2H 3He , 13C16O 2 0 10 20 30 18O 2 40 50 L2-5 © 2000 A.Pines M.Kubinec UCB Relative Atomic and Molecular Mass H 1.01 12C Empirical and Molecular Formula Methane Ethylene CH 4 CH2 CH4 C2H8 C3H12 CH2 C2H4 C3H6 CH C2H2 C3H3 L2-5 L2-10 Al 26.98 P 30.97 Fe 55.85 Pb 207.2 H2 2.02 O2 32.00 H2O 18.02 CO2 44.01 L2-5 12.00 C 12.01 O 16.00 © 2000 A.Pines M.Kubinec UCB Acetylene CH © 2000 A.Pines M.Kubinec UCB © 2010 Pines,Kubinec, Nitsche UCB Rutherford’s Scattering Experiment Deflection of positive α-particles on gold foil proved : Atom has a dense center of positive charge - Nucleus © 2010 Pines,Kubinec, Nitsche UCB L2-6 Atomic Structure (Nucleus + Electron Shells) -Z +Z Z electrons e - A Z X A: Atomic Mass Z: Atomic Number Atomic Symbol A = Z (Protons) + N (Neutrons) © 2010 Pines,Kubinec, Nitsche UCB L2-7 ©2010 Pines,Kubinec,Nitsche, UCB 2 L2 Chem 1A: "Atomic Stucture, Mass Spectra" Elementary Particle Data mass (kg) Proton (p) 1.67262 x 10-27 mass (amu) charge 1.00728 +1 0 -1 Neutron (n) 1.67493 x 10-27 1.00866 Electron (e) 9.10939 x 10-31 0.000548 10 p and n are made of quarks,held together by gluons Up-quark (u) © 2010 Pines,Kubinec, Nitsche UCB charge + 2/3 e0 Down- quark (d) - 1/3 e0 p = uud n = udd L2-8 Ice Cores © 2010 Pines,Kubinec, Nitsche UCB L2-9 Temperature and CO2 Data Data L2-10 Source: GOOGLE, Dr. David Evans, consultant to the Australian Greenhouse Office © 2010 Pines,Kubinec, Nitsche UCB ©2010 Pines,Kubinec,Nitsche, UCB 3 L2 Chem 1A: "Atomic Stucture, Mass Spectra" Mass Spectrometer Ionization - N Magnet Mass Spectrum Sample Acceleration S 1H 2H 2, 1H 12C 16 O 13C 16O 1H 16O 18O 2 , 2 12C16O 2 1H2H 3He , 16O18O 13C16O 2 0 10 20 30 mass units 18O 2 40 50 L2-11 © 2010 Pines,Kubinec, Nitsche UCB Relative Relative Atomic and Molecular Mass H 1.01 12 12 C Al 26.98 P 30.97 Fe 55.85 Pb 207.2 H2 2.02 O2 32.00 H2O 18.02 CO2 44.01 L2-12 12.00 C 12.01 O 16.00 © 2010 Pines,Kubinec, Nitsche UCB ChemQuiz© 2.2 An equimolar mixture of oxygen atomic isotopes forms oxygen molecules. Which is molecules. the correct O2 spectrum? O O 16 O 16 O 18 18 OO 18 16 16 O O 18 O O 16 16 18 A) 32 34 36 B) 32 34 36 C) 32 34 36 © 2010 Pines,Kubinec, Nitsche UCB L2-13 ©2010 Pines,Kubinec,Nitsche, UCB 4 L2 Chem 1A: "Atomic Stucture, Mass Spectra" ChemQuiz© 2.3 Combustion of a hydrocarbon with O2 yields products with the mass spectrum shown. Which Which is the hydrocarbon? hydrocarbon 18 44 A) CH4 Methane © 2010 Pines,Kubinec, Nitsche UCB B) C2H4 Ethylene C) C2H2 Acetylene L2-15 Empirical and Molecular Formula Methane Ethylene CH4 CH2 CH4 C2H8 C3H12 CH2 C2H4 C3H6 CH C2H2 C3H3 L2-17 Acetylene CH © 2010 Pines,Kubinec, Nitsche UCB ChemQuiz© 2.4 30g of phosphorous react with 40 g oxygen gas to form an oxide. What is the emperical formula of the oxide? P Molar Molar Masses P = 31 g/mol O = 16 g/mol O2 1) PO2 © 2010 Pines,Kubinec, Nitsche UCB 2) P2O5 3) P3O4 L2-18 ©2010 Pines,Kubinec,Nitsche, UCB 5 L2 Chem 1A: "Atomic Stucture, Mass Spectra" Lecture Complete © 2010 Pines,Kubinec, Nitsche UCB L2-20 ©2010 Pines,Kubinec,Nitsche, UCB 6 ...
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This note was uploaded on 04/24/2010 for the course CHEM 1A taught by Professor Nitsche during the Spring '08 term at Berkeley.

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