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142exam_answers_Exam_1_Vers_A_revised

142exam_answers_Exam_1_Vers_A_revised - CHEMISTRY 120A HOUR...

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Unformatted text preview: CHEMISTRY 120A HOUR EXAM I (Version A) Autumn 2007 Tuesday, October 23, 2007 Name: ' TA Section: Student Number: TA Name: Score (pg) 1 LCDN ‘ GOOD LUCK! Watch the sig figs, and units SHOW YOUR WORK! Total (x/100) l. DEFINITIONS (16 pts): Define any eight (8) of the following terms in the context of this course: *octet rule fivmbmrj eféM/ng 94m; )4 «21/5»: mel/r )6; gag/£4,913. V 6/54 f/(C/fimf f}, oq/wrp 5- ,/K *anion VS cation ”V’ ‘7ng ”0n / 6717/0»), fax/,K'W/a». /Ca7)/'on) *positron a” rang-{4019a , ova quasi, GM 9* /¢'/a:3( ”/9 7! , * - ' 45/: r162 6/05? 040’) N7» No/lé;aa (99/1/9532. rad VS rem VZZ/éiijhf a/FZ/C/cg/ta/Qlénjéj‘r. { I‘fln: VO/9‘ 745,41) * amma—ra vsX-ra é 4 am ("7’7 mafia/ah/namrr. )fim . _ 1/ *alpha particle 68/11,». mac/(m- 2%., I *amu aném/c‘ 47745"; ”77/71, ’1; fl? W¢§S a/c; 2C 9,4,,“ , aloe“. * - - til/“5GCVDS'5/ {/fl c; [Pf/N-J‘A’fl’h) 9Ve(/)J/ penOd VS mg £522? Aé/p, q// 44w 24w ”GA/"fr SL// Can/{54; 14,950“ *pure substance vs mixture pom: 22/94))“ , /€/W”$/ov cam/ow”) éa)‘ A‘Xté) g/mvi/ C our/AIR MIX/é” o’c-f: 47 (:71 *ionization energy en ”77 m {QQZWez/«j /Z ( “Arms/(46% A ,1' A. ) 9% c) “I *isotope :6 223w mam/Ira /§9/’= r/ 44/ 5/5/41») coma/ax c/W‘Mmf *specific gravity _ dad/é ofscltpflé/(g/Gnyxg a; «4/4) ll. CONCEPTUAL, SHORT ANSWER ( subtotal = 45 pts) 1. Name the following compounds: NH4N03 NaHCO3 CuzO awn/0771241" 44/74/924 Foo/fa». 5"quéoy9/é (“cw/J91“! L77 07/04 2. Write correct chemical formulas for the following ionic compounds: lithium nitrite ammonium chlorite calcium hydrogen phosphate “We M4, (10,, a, may 3. Write the chemical formula and give the name for ionic compounds formed from the following pairs of elements: ‘ lithium and sulfur , aluminum and nitrogen tin(l\0 and phosphorus 4. (Choose correct wordino)The general trend in the periodic table is for ionization energy to decrease) across a period, but to (increase, -downagroup. Why? flew/or; a /n~‘ac/, meé/ r G/g’qc/‘k— gér 65,41, {/{c/Qahg ./')1(‘mff; hf. infr‘far/v fie mhmévr, 96% q $flllf/ e/(c‘X/Qar X‘s A/fi'jrp m aw 74v 1/ {and . MQC/fgc/ ”(If fcrfi'é ”MW, 5. (Choose correct wordin The general trend in the periodic table is for atomic radius to (increased across a period, but to-decrease) down a grouP- Why? £0”; 9’ fl? "be”, /'3’Irr~ca:/>’ 474/ 641/ q, r/ag, fla/é’ F/(‘c/{avx C/otréJ c/cff'V 7? “bx/far. Date» c; 314% , Q's?!“ 07 P/Cr/{aar on! IQrflr—‘r & fl? fiat/r1753 6. How does a ‘scientific theo ,’ iffer from a ‘hypothesis’ ? ' ”Xx/fink”; 914/ 1):; £9% 54996 96p/wié/ 4 cvi: ex /6/'m‘,,0 i— rgYflQ/fwé/Gés’f/Wfl/ihj ”41% {7/6171 q 4j/a 573 ”giggflfgy, flm/arte’Py/éhqfilfia of 0153"”; an. (xx/$4 ' [s {erg/4, 24/57’5294//_ _ 7. How many electrons of the type indicated are in each of the following atoms? 3d electrons in Fe 5p electrons in Ba 4d electrons in | 5 g /o 8. Write electron configurations for each of the following atoms: P Cr Ga 1572539/63573/3 527522/ ‘3: 25,0 ‘45 ’30,:- /r72:22/63523/ (V: 230’ /o%a ’ 9. ldentify the element with the following electron configuration: (Ar) 4523d1° 1822822p63323p4 2m flawed 5 (may) 10. Identify the maximum number of electrons possible in each of the following: 4p orbital 4f sublevel 3d orbital n=3 level 53 /4 X 07412: /8 11. Complete the following nuclear fission reaction: 235 92U + 1on ----- > 131 5oSn + ? + 2 1on + energy 7 /.03 #2 MO 12. Write a balanced nuclear reaction for the alpha decay of 208 84% " 208 9 . ' P + 204/ 5.5, o ”T? 2 64- 92 PA 13. Complete the following nuclear reaction: 351GS""> ? +0-16 7‘ a: /} Cf lll. QUANTITATIVE (subtotal = 39 pts) 1. The average world temperature today is 15 °C. Convert this temperature to the Fahrenheit scale (°F), and also to the Kelvin scale (K). Recall that T(°F) = 1.8 T(°C) +32 T(K) = T(°C) + 273 a - , / a +Z2 77 U' ”007) 7/10,: /;"c 7L2}; :259/2 . :@ 2. A graduated cylinder contains 153 mL of water. A 15.5 gram piece of iron (density =7.86 g/cm3), and a 21.4 gram piece of lead (density = 11.3 g/cms) are added to the cylinder. What is the new water level in the cylinder? (Recall that density = mass/volume, usually in units of g/cm3) ;135%L //.;%’4 " /9;/ml ML 3. Cesium-137 is a beta emitter with a half—life of‘30.0 years. How many years will it take for a Cesium-137 sample with a measured radioactivity of 56 Bq to decay away to a final radioactivity of 3.5 Eq; (2)0)0)0):2y fig): /é&’ éq/f/Z/[VPI G/fiw 4. Lead (Pb) consists of tour naturally occurring isotopes. Calculate the average atomic mass of leadI a‘mh) Isotope Mass Abundance (%) 204Pb 203.97 1.40 206Pb 205.97 24.10 207Pb 206.98 22.10 208Pb 4 207.98 52.40 @709/40) /203. 9;) + /o'- 21w ) (205-. 9;) + fo.22/a)/2ac.%’) + foggy/20} .93) ’— —-. ...
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