Ch115_T1A_F06_Key - Page 1 of 5 a Name K {2.7 ' (Please...

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Unformatted text preview: Page 1 of 5 a Name K {2.7 ' (Please Print) Student Number Chem 115 - Section 1 Hour Examination I October 13, 2006 This test consists of five (5) pages, including this cover page. Be sure your copy is complete before beginning your work. If this test packet is defective, ask for another one. A copy of the periodic table will be distributed with this test. DO NOT WRITE BELOW THIS LINE TOTAL Robert L. Carter, Ph.D 6 9.010 ocw.umb.edu Page 2 of 5 Name K gy 1. (10 points; 2 points each) Who did what? Match the person with the concept or discovery. a People Becquerel Chadwick Dalton Davy Lavoisier Mendeleev Millikan Moseley Nagaoka Proust Thomson Rutherford Concepts and Discoveries a. Em 15be M I \\ it than Determined the charge of the electron c. T in 0 mac v\ Proposed “plum pudding” model of the atom CI. CM “hail yd} Q E Characterized the neutron from calculations on nuclear reactions e. RUTHA Dr {lav-g1 Characterized radioactive emissions as a, B, and 7 radiation His Law of Definite Proportions lead to atomic theory b. 2. (8 points; 4 points each) Give answers to the following items, which refer to C5H4O3 (m.w. = 112.08 u)- N, I 6.022 x 1023; at. wt. C =12.01, H =1.008, O = 16.00 u. 2.7. c atoms in 0.4325 g ofC5H403 \ -\ (a 2. )5 \ (2 weight percent C in (."ISH.,O3 g 73 , g 63 072 3. (12 points; 6 points each) In the spaces provided, balance the following skeletal equations, using lowest whole number coefiicr'enrs. 5‘ HgtNoah + Fe " “Q + 1360903): 3 H3CN02>9L + 2, Fe. --P + 2, Fccm%\)3 b. C4H602 + 02 A ? (combustion) O‘ruaoz*%oz, H (L602. Jr 51"?er TA 1? lqwuboz—v sol”? ‘ZCOL 4" {o- Robert L. Carter, Ph.D G 2010 ocw.umb.edu a 4. Page 3 of 5 Name 1: ¥ (36 points; 6 points each part) Fill in the blanks with the correct answers. a. Name the following compounds, using 1.U.P.A.C. rules of nomenclature. " floaut M. \ r1~ meme Fe(HCO3)2 i r l I :- IrlClO.1 e:_r . Give formulas for the following. ammonium chromate [ kl H3)! C30, I, tetraphosphorus decoxide pg 0, a . Indicate the number of protons (p), neutrons (n), and electrons (e). n: ":53? e=5l e= 3"? p=_i'>_L p: a? ToGa atom 59C0?” ion n= 32 . Give the symbol and name of the following elements: symbol N Ename In W m symbol Cr name ("3th m} Mum Indicate whether eachof the following compounds is ionic or molecular. 3rd period alkali metal transition element with Z = 24 so2 Malawi” CaS 'anwg Answer the following: (10.53 — 9.5762) 0.235093 (ii) For each element, give the expected charge when it forms a monatomic ion: 2 (i) The answer to the problem should have significant figures. Sr 1+ ll" (0T3wa'l-—) (iii) Which one of the following elements forms ionic compounds in which its monatomic ion might have one of two or more possible charges: Al, 1, Fe, Ba, Cs? Answer Pg. Robert L. Carter, Ph.D 6 2010 ocw.umb.edu Page 4 of 5 Name Ee¥ 5. (16 points) Answer both parts. Show work in the spaces provided to justify your answers. a a. (12 points) A compound contains 88.818 % carbon and 11.182 % hydrogen. What is the empirical formula of this compound? (at. wts.: C = 12.01 u, H = 1.008 11) Aééwm 13, \00.003 cswfiyathd, maid: (3%,81@303(MQ :4 5618-- a 12,0'IEC, I M @l '57 2 M H :- LHAQL R) x“ z W :7 nacho) “=08 .‘M-H :>\.°§ :93 ng5 b. (4 points) If the molecular weight of the compound is 54.09 u, what is its molecular formula? 5}, 1,0,6,er ,3: 2.1.04: Leo. 310% 7’ > “fl-*4, Robert L. Carter, Ph.D © 2010 ocw.umb.edu Page 5 of 5 a Name K g¥ 6. (18 points + 5 points bonus) The Blenz‘ ion is a cage-like structure of twelve boron atoms. The sodium salt of this anion can be prepared by the following reaction: 2 Nana4 + 5 anfi » NazBquz + 13 H2 How many grams of H2 gas will be produced when NaZBuI-I12 is synthesized in the reaction of 0.250 g NaBH4 and 0.400 g BZHG‘? You must identify the limiting reagent, based on appropriate calculations. Show work in the spaces provided to justifix your answers. [f.w. NaBH4 = 37.83 u; m.w. Hal-I6 = 27.67 11; f.w. NaQBuH12 = 187.3 u; m.w. H2 = 2.016 1.1.] Memes =L0,1‘Sp M»BH\M— :- 0 L0 " 3 “' mwsgotsuw 0'9 5 saw” 0-. 00695085. I a =- 0.002530% was”: (moozszsbxéwzwfmbw )7. mow-lavgws—Q 2' IL: £3 £9 Germs”: = moozmlerQ. ‘=%;P xahzfiJté \IIVVMa‘kfa (§§‘*Iz.15 (LC)0C> l¢*‘fsu'vmmay2.15"yxfir)(:faaVVLOE *‘1, \j)(21.53\‘=a *J‘z_i) Gt cam/AB,» MAL ‘3'"- O.0453_+%H2_ T- O.D'+S‘ga_ H; BONUS (5 points) How many grams of the reactant that is not the limiting reagent will be left over after the reacion is complete? %NmB\-\¢¢ mead 2: (0.0 “+45 My“; )(ZMNlmqy31.? “2.3% a 2. (, Egtnmre E51)*6 valt. E5*¥q "- 0.11%;03 NnBHW 1:. 0.2161 QULPJHQ @N'AI'M-ht \eL-‘c: 0.2302“- 0,2.ng 3' 0.093 Robert L. Carter, Ph.D © 2010 ocw.umb.edu ...
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