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key-q3ce - Quiz Number 3 Chemistry 122 Dr Mathews Tuesday...

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Unformatted text preview: Quiz Number 3 Chemistry 122, Dr. Mathews Tuesday, Feb 6, 2007 Name Carmen ID Lab Instructor/ Section No: l. (5’ pts) Recall the demonstrations given last Thursday and describe the different methods used to oxidize lycopodium powder. Identify the most effective and least effective, then describe the factors that contributed to the differences. 16/3 w 6/ r w/a/r‘ m a, w/ : /e «J Jan flaw) Lao/er Mb me, 79 a M m P) :Caspaefffim 790 was? 24F 0914+ ’Lm arm inap/ dide/Me: Sal/‘74)?” cit/29c? EKWSIZO/ 75952 Mme! 2. (9 pts) Use the observed data for initial rate of appearance of FsBNH3 in the reaction BF3 (g) + NH3 (g) —-—> F3BNH3 (g) to answer [BF3 ] [NH3 ] the followmg questions , ' 0.250 0.250 0.2130 a) What IS the rate law? 0.250 0.125 0.1065 fie Mr ”‘47- ? b) What are the units of the rate constant? » c) Calculate the average rate constant from the observations. 3. (6 pts) The gas-phase decomposition, SO2 Cl2 (g) —> SO2 (g) + Cl2 (g), is first order in the reactant. At 600 K, the half- life 1s 2. 3 x1055. a) What is the rate constant at this temperature? b) If the initial concentration of the reactant is 0.7561‘1’1'n'~ ' ' ill it take for the concentration to be reduced to 0.150 M? \ 68:3 WW ' Quiz Number 3 Name Chemistry 122, Dr. Mathews Tuesday, Feb 6, 2007 Lab Instructor/ Section No: Carmen ID 1. (5 pts) Recall the demonstrations given last Thursday and describe the different methods used to oxidize iron to iron oxide. Identify the most effective and least effective, then describe the factors that contributed to the differences. fiWflM Fapbk fifi‘fi/wafl/ Fa paw/er 57(89wa 9; /933+ PAQQL‘II/V 4 Two 57L 6 7/7634 74m” Prrma rc/ Mfg/MES' 5w7§na 8!?ch fi/Fe $317M % 9 2. (9 pts) Use the observed data for initial rate of appearance of F3BNH3 in the reaction BF3 (g) + NH3 (g) -—> F3BNH3 (g) to answer [BF3 ] [NH3 ] the following questions. a) What IS the rate law? fig pmé ML 3‘7 b) What are the units of the rate constant? - 0.250 0.250 0.2130 0.250 0.125 0.1065 0.200 0.100 0.0682 ' 0.350 0.100 0.1193' c) Calculate the average rate constant from the observations. '3. (6 pts) The decomposition of NO2 proceeds as follows: order in N02, with a rate constant of 0.543 M ' s' at 300 °C. a) If the initial concentration of NO2 1S 0.260 M, how long will it take for the concentration to drop to 0.100 M? N02 —> NO + 1/2 02. The rate law is second Quiz Number 3 Chemistry 122, Dr. Mathews Thursday, Feb 8, 2007 Name Carmen ID Lab Instructor/ Section No: 1. (5 pts) Recall the demonstrations given last Tuesday and describe the different methods used to oxidize natural gas (methane). Identify the most effective and least effective, then descri7 the factors that configtfu:::j5the;ig:;ncg:bé125/ bad/0017 w/Cfia’ar/ 1" )752 )71/00y; w dfiifflz /w 71/513 L4!” Tszfg/Mwfi 2. (9 pts) Use the observed data for initial rate of appearance of NOBr in the reaction 2 NO (g) + Br2 (g) —> 2 NOBr (g) to answer the following questions. 7/ IE“ 8” “afiirite‘l’fiv We? 1150 ; ’ ' 3 050 b) What are the units of the rate constant? Ms: :AéI/VI}; 4. (6 pts) Strontium-90, 90Sr, is a radioactive element which decays by emitting a B-particle. I ' order process with a half-life of 28.8 years. Contamination of the environment with this isotope poses s 'ous .A/ health hazards because of its persistence and similarity in the body to calcium makes it a particularly difficult contaminant. a) What is the rate constant for the 3decay? Be sure to include appropriate constants. _. 0:693 lé¢3 __ -/ éée "'2'“ .=—f§§;;~ flaw/)xr b) If a sample of grass and hay initially contains a total of 100.0 g of 90Sr, how much will still be present after a period of 86.4 years? [Note: If necessary, you can either assume the mass is dissolved in a liter of solution or simply use the mass instead of concentration] q3e.wpd ...
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