L02_AtomicStructureMassSpectra

L02_AtomicStructureMassSpectra - Lecture 2: "Atomic...

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Unformatted text preview: Lecture 2: "Atomic Structure, Molecular Formulae " (Nucleus + Electron Shells) -Z +Z Z electrons Atomic Structure A Z e X A: Atomic Mass Z: Atomic Number Atomic Symbol A = Z + N (Neutrons) 2006 M.Kubinec, A.Pines L02-3 Ice Cores 2006 M.Kubinec, A.Pines L02-4 Temperature Data 2006 M.Kubinec, A.Pines L02-5 2006 M.Kubinec, A.Pines 1 Lecture 2: "Atomic Structure, Molecular Formulae " Mass Spectrometer Ionization - N Magnet Mass Spectrum Sample Acceleration S 1H 2H 2, 1H 12C 16 O 13C 16O 2 1H 16O 18O 2 , 16O18O 12C16O 2 1H2H 3He , 13C16O 2 0 2006 M.Kubinec, A.Pines 10 20 30 18O 2 40 50 L02-6 Relative Atomic and Molecular Mass H 1.01 12C Al 26.98 P 30.97 Fe 55.85 Pb 207.2 H2 2.02 O2 32.00 H2O 18.02 CO2 44.01 L02-7 12.00 C 12.01 O 16.00 2006 M.Kubinec, A.Pines ChemQuiz 2.1 An equimolar mixture of oxygen atomic isotopes forms oxygen molecules. Which is molecules. the correct O2 spectrum? O O 16 O 16 18 O O 18 O 18 16 16 O O 18 O O 16 18 1) 32 34 36 2) 32 34 36 3) 32 34 36 L02-8 2006 M.Kubinec, A.Pines 2006 M.Kubinec, A.Pines 2 Lecture 2: "Atomic Structure, Molecular Formulae " ChemQuiz 2.2 Combustion of a hydrocarbon with O2 yields products with the mass spectrum shown. Which is the hydrocarbon? hydrocarbon? 18 44 1) CH4 Methane 2006 M.Kubinec, A.Pines 2) C2H4 Ethylene 3) C2H2 Acetylene L02-10 Empirical and Molecular Formula Methane Ethylene CH4 CH2 CH4 C2H8 C3H12 CH2 C2H4 C3H6 CH C2H2 C3H3 L02-12 Acetylene CH 2006 M.Kubinec, A.Pines ChemQuiz 2.3 31 g of phosphorous react with oxygen gas to form an 71 g of a phosphorous oxide. oxide. What is the empirical formula of the oxide? P O2 1) PO2 2006 M.Kubinec, A.Pines 2) P2O5 3) P3O4 L02-13 2006 M.Kubinec, A.Pines 3 Lecture 2: "Atomic Structure, Molecular Formulae " ChemQuiz 2.4 Which graph correctly depicts the accumulated mass of the phosphorus oxide versus mass of added phosphorus? phosphorus? 1) 2) 3) L02-15 2006 M.Kubinec, A.Pines 2006 M.Kubinec, A.Pines 4 ...
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This note was uploaded on 08/12/2008 for the course CHEM 1A taught by Professor Nitsche during the Fall '08 term at Berkeley.

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