C111Hel-prism F09 T2

C111Hel-prism F09 T2 - 1. a. (10 pts) Sodium nitrite...

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Unformatted text preview: 1. a. (10 pts) Sodium nitrite (NaNOI) is a preservative used in cured meats such as hot dogs and has been A implicated in certain cancers. There are two Lewis (resonance) structures that can be drawn for the nitrite 10—11, N03‘. Draw them, showing complete octets for all atoms. N is the central atom. Include formal charges where appropriate. - a” I m é&%wc e.ng \ Gefid) me f—[ibfié 0: 6c( wilt . __ L @5 pts) Use VSEPR theory to predict the approximate O-N—O bond angle. _ [if Veal 1312/ _ Rated (90' ,WA 190° Qfll’ JD— 2. (10 pts) If a researcher needs to make a 0.100 M solution of NaHC03, how many of solution can be made using a 340.0-mg sample of NaHC03? gqomjlé ow [006.5 m glooumodu may} I 113k “[1 {6' “'3 aloe made A] ‘________._._.. flL 5 .009 ("Oh WAF%L Q'thoz wet {I =3 (10 pts) Citric acid, which can be obtained from lemon juice, has the ar formula CW7. A _Q_ ' fg§£l-_gfaunple of citric acid dissolved in 25.0 mL of water requires 42 f 0.105 M NaOHafor complete neutralization. How many acid Eydrogens per molecule does citric acid havei.i i I 6 Mom N‘O@i‘ ii} ‘1.) t’gg'v‘; to C: .ODQQ em rhth «AS 0 5+ {1:0 C n o D [AME . _ -. j H ¥ ff ,: Jig-air? ma A C: (1Lng M ( \JQC I I/qOL I I £ ecotsmMCe “307Mng 5’! L—l: 4. a: ts)'Calcium ion concentration in urine can be determined by treating urinemwhich contains CaCl; " (aq)-- .‘tl: sodium oxalate, Nazczoe (aq), to form a precipitate. . *1. ’1 'H HI (1:, each (at?) + Na 2 (at) —> 1*) Ce got.) a L N R q _ _ _ . 1 Write the net ionic equatton for this reachon. “ b. (6 pts) Treatment of a 5.00 ml. sample of urine with excess Nazczo.‘ (aq) produced f precipitate. What is the molarity of Ca” in the sample? - ' - - .ObGK—z 5. Blood alcohol (CZI-ISOI-l) level can be determined by titrating a sample of blood plasma with an acidic S" dichromatc solution. The balanced redox equation is ' ‘u 'I fix; 'ii‘u‘b‘ t o 16H*(aq)+ zcrzoflaq) + c; 5913qu m“ (aw 2C6; to + 111120 (I) “‘1'”: _['-] +1523 Tirefli+w a. (10 pts) If 35.46 mL of 9.2536134“ Cr30-f' solution is required to titrate 28.00 g of blood plasma, determine the mass percent of alcohol in the blood. .o’fiqqgc. .ogqolm ' : no: most-a c9072 1 L. ' 002 r . W""‘07"M fidLfig/ _,. ‘01,,93 q'de—xolo 1%on - who who” 43 ‘ 1 b. (3 pts) What is the oxidation state of the chromium in 0:20? 7 “1 *1 (. . (2 pts) What is the reducing agent in this reaction? (mt) WI 63311“ 19b; :5 3.“ 7. (10 pts) A bicycle tire is filled with air to a pressure of 75 p_ounds per square inch si) at a temperature of 19°C. Riding the bike on a hot day increases the temperature 0 e . The volume of the tire (D V .U .1 n i increases by 4.0%. What is the new pressure (in psi) in the bicycle tire? \[,-_.‘L P: 375 fiO/n—L lamk3'5i- 5mm ~l loq twin: 5 15.? MIL: WLVZUL . l 1m QV‘ PLUI 7‘ I/ : % ?‘\II I}. \[ JR (“f/riff ' L/’ 5X1.\Qf‘__-.—\ V1 1 ‘ - gut? P5: Qt 1 /:\J.L\l / 8. (10 pts) Car air bags inflate by the rapid generation of nitrogen gas as follows: 2NaN; (s) —» 2Na(s) + 3 Nam) What mass ofNaN3(s) must be reacted to inflate an air bag to 70.0L at STP (0°C, I aim)? Assume no contribution to volume due to Na(s). H “'— IJ'Hr7C‘[C".i"' (“IQ ': ’S Hoikvwmt _, {IL-Ci— Cf -- m 1‘" - . - - r V _ » - fi;‘_d____ I. qggo : firearm 70‘ { filiw w: M 9. (10 pts) Circle your answer: At STP the mass of 860.0 mi. ofan unknown diatomic gas is 2.721 g. What is the identity of this gas? E f A) (:02 B) 13 c 2 D) N2 E) 02 Mar Miss a 1'32" (mu; I’MQCSS—Z'd .OBZOC.133 w (“*M 386 ...
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This document was uploaded on 11/04/2011 for the course CHM 111 at University of Miami.

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C111Hel-prism F09 T2 - 1. a. (10 pts) Sodium nitrite...

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