CHEMISTRY.142.AAA.WINTER.2000.MIDTERM2

CHEMISTRY.142.AAA.WINTER.2000.MIDTERM2 - Chem 1423 Name...

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Unformatted text preview: Chem 1423 Name Winter Quarter 2000 Exam #2 #— Febru 2. (5) 3. (6) (a) (b) (c) Lab/Quiz Section B G (1) 18, 2000 LabJQuizTA 5 l , (l) 1. (8) Give the oxidation number of the underlined element in each of the following chemical compounds: (‘0 Na29120;; :1; Cr = 9 glznzzofl C =4 93,. 11. (c) Cafl2 H = ‘l .4..- f4! .1 i . 'l‘d‘:r6 _ (3) 211162035 C1 = AZ— (t) NaHZiEQ;t P = i" 5 4-! FL '3 ‘- (g) H.204 N = L__ 3 (h) Fezfidgh S = (3 V 1 Give the complete chemical name or formula for each of the following chemical compounds: AMWnlfie-u (a) (NH4)2 C03 (b) Butane M (C) H202 Maria“ ((1) Sucrose Cg “lg/fig (e) H3P03 ’0 2‘ and Give the oxidizing and reducing agents in the following Redox Rx: Q 41 1'1 _. « O . 2Li(s) + 2H20(l) ——> 2LiOH(aq) + H2(g) Ox Agent it Red Agent L- o? a 83(5) + 802(g) —> 8302(g) Ox Agent Q; Red Agent 5g Mas) + N2(g) —> Mg3N2(s) Chem 14213 ~ EXAM #2 Page 2 4. (24) Complete and balance the following chemical equations: (a) Na2803(s) 75‘ J No.6) + s 0% (a) (b) ___9~ AgN03(aq) + ___. Na2€r04(aq) —> 43; o 01%;; NA ll 03%) 4 9- @ Na2804(s) HES—+DINQQ 1,39%“ er K (d) _3 H2504(aq) + .3; A1(0H)3(s) a A izéoq)” «6319(2) + a. (e) Fe(s)+ él HCl(aq)-—> light MiG) . <33 2 (t) iMn(s)+___AuC13(aq)-> 4019+ much 85) ' (g) _.&CGH14(1)+A02(g)T§IQCowjmvcm + 9, (h) _P4(s)+%(g>—> 5&0 633(3) + , (i) fiNaI(aq)+__Br2(aq)-+Qua 3&3; 3:1 (9 4_ } (i) ____._ 311(5) + i. MgC12(a9) —> Sh Ch Lelm 4., I (19 afif (k) __ Na2803(aq) + __ HC1(aq) -> [Va l L (a 03 (I) F6C13(aq) + 3 NaOH(aq) —> Fcfo [+23 :3 Cl ’1— \ 9' fl Chem 142B — EXAM #2 Pa 6 3 5. (10) Ozone Destruction Chemistry: (a) Write the three chemical equations for ozone roduction in the stratosphere, indicating which ultraviolet light is being orbed. 09' +0 03 7/ % e91 6% 03*01 (:flglOL (b) Write, the two equations and the overall equation for the ozone destruction by nitrogen oxides from the SST. I/lo3 ¢ 03 49 N01 e- 201 4/ 001433» +201. W (c) Write the three equations and the overall equation for the destruction of ozone by freon ll (CF2C12) indicating which ultraviolet light is being absorbed. ’2/ CL. “:33. >2 C10 M31 _ CJO #055 W CH ch, J) -, “AOL 6. (10) Calculate the empirical an ole ar formulas of a compound that is found to contain 18.01% carbon, 2.27% hydrogen an he remainder chlorine. The molecular weight was found to be 267 g/mole. {2.01 w : Max:957: when/m 2.1-, 4.039 = :m 7W35a5= 5/ '-= MN: Chem 142B — EXAM #2 Pa 34 fl (9) 0 Calculate the volume of nitrogen dioxide gas produced at a pressure of 735 Torr, and 28.15 °C, by the reaction of 4.95 cm3 of copper metal with 230.0 ml of concentrated nitric acid ((1 = 1.42 lcm3, 68.0% HN03 by weight). (ml.— Cu(s) + 4HNO3(aq) —-> Cu(NO3)2(aq) + 2N02(g) + 2H20(l) '2 107751W3 CK 5530‘ The concentration of aqueous NaOH solution can be determined by standardizing it against the pure solid benzoic acid HC7H502. Calculate the concentration of an NaOH solution if 41.11 ml was required when titrated against a sample of HC7H502 with a mass of 0.7516 g. .7576 Arm; HC7H502(aq) + NaOH(aq) -—> NaC7H502(aq) + H200) Chem 1428 - EXAM #2 Page 5 6:99) Calculate the density of Freon-12 (CF ZCIZ) at a temperature of 120 °C and a pressure of 1175 mmHg. 10. (10) Calculate the pressure of a sample of chlorine gas (1.956 moles) using the ideal gas equation and Van der Waals equation if it has a temperature of 337.8 °F and a volume of3.l651. 4, 33,55“ 10-: he: V 2 #5 m, ,0 . x “H I” J (5( {105) (934 550 : $3.90, ml“ 3Jo’94. 11. (5 Bonus Points) The chemical symbol for the element lead is Pb, which comes from its old Latin name Plumburn. What is the modern name for this element? Answer Lead ’5 lo ...
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CHEMISTRY.142.AAA.WINTER.2000.MIDTERM2 - Chem 1423 Name...

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