Chem103F08T1 - Che111103 Fall 2008 Exam 1A October 2 2008...

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Unformatted text preview: Che111103 Fall 2008 Exam 1A October 2, 2008 Name Section For Full Credit 011 P blems, SHOW WORK 1(11 pts) Place the correct answer in the space at the left. MEI—W 1. The statistical term that describes the middle value in a set of data is called? ML— 2. The statistical term that describes the value that occurs most frequently in a set of / data is called? - m Calif/[423. A11 weights in the current periodic table are based on the mass of the specific nuclide? [,¢_fl_fl__.____ 0 22 )l/ 0‘13 4. The value f Avogadro 3 number is? [p Paraffin? 1‘ (on: $711!“ 1Lfi20‘3’54h01 Specific compounds e made up of a specific ratio and kind of atoms. The is the Law of _ I V) £fl5lt’e 6. A prope1ty'that is independent of the amount of material present is said to be an intensive/ extensive property (choose one) 3474'” SEEW’QV The instrument used to determine the mass and percent abundance of isotOpes is / 1. . called a H 8. A p1 oton is the same as a hydlogen nucleus (the hydrogen ion), the complete - ' nuclidic symbol fo1 a p1oton is? 5’ A. 9. The phase of matter that describes conditions at very high temperatures where the ionized gas acts as a unit rather than individual atoms is? gmdpm; cute 10. The phase of matter that describes conditions at extremely low temperatures that is a gaseous superfluid is? 4/#& l1. Zg¢MS 11. Elements in Groups 1 are known collectively as ? , II(12 points) Put the letter of the correct answer in the space at the left a 1. Which of the following 1s NOT a conect prefix and corresponding power A. kilo, 103 D. mega, 106 B._ centi, 10'2 E. milli,10’3 C. pico, 1 0 T 9 [4 2. Which of the following statements from Dalton’ 3 Atomic Themy 15 no longer true based on modern atomic theory? A. Elements are made up at tiny particles called atoms B. Atoms are not created or destroyed in chemical reactions (.1 All atoms of a given element are identical D. Atoms areindivisible in a chemical reaction B. All the statements are still tme /3 A... Name Chemios Fa112008 Exam 1A October 2, 2008 Section 3. A titration was performed to find the concentration of an acid and the following data was obtained: "' ' Trial Concentration 1 1.25i 0.01 ' 2 1.1-0i 0.01 3 098$ 0.01 Average 1.11:1: 0.01 The actual concentration of the acid was found to be 1.100 M. The data was? A. Both accurate and precise B. Accurate but imprecise C. Precise but inaccurate D. Both inaccurate and imprecise E. None of the above 4. Which of the following is a not a chemical change? . Milk turns sour B. Sugar when heated turns brown C. Battery cables corrode : D. Heating hard boils an egg B. Cooling humid airs causes fog > 5. One molecule of a compound weighs 4.12 x 10"22 g. What is the molar mass of the compound in g/ mol? A. 248 B. 122 I C. 114 D. 92.1 E. 48.0 6. The density of sunflower oil is 0.920 g/mL. When water is added to sunflower oil, Where will the water be: It will float on top It will sink to the bottom It will mix so you can’t see it It will make your car run better It will float in the middle of the oil mwowe 7. Which of the following does not describe a liquid? substance has a definite volume the shape of the material depends on the shape of the container . atoms are close together ' . -‘ ' ' atoms are highly organized atoms are in contact with each other 41150.53? Chem103 Fall 2008 Exam 1A October 2, 2008 Name A g; Section A 8. Which of the following is not true for a chemical change? A. substance changes into another substance B. the process is easily reversible C. phase may change D. substance may be converted to more than one new substance E. all of the above are true ,—~ _ Zr 9. Which statements are correct for the nuclides igX and 3X4“? 1. They have the same number of protons 2. They are the same element 3. They have the same number of neutrons 4. They have the same number of electrons A. All are correct B. 1 and 2 are correct C. 1,2, and 3 are correct D. 1,2, and 4 are correct E. 3 and 4 are correct 5 10. If the following isotopes of nitrogen (":N and EN) and oxygen (‘20 and 1:0) occur naturally, how many different molecular weights are possible for N20 from these four isotopes? A. 1 B. 4 C. 6 D. 8 E. 16 fl 11. The common species present in all acids is? A. H2 B. H+ C. one D. 1-120 E. HCl 5 12. Elements that are an alkaline earth metal, a chalco gen and a noble gas in that order are? A. Li, 1, Ar C. Sr, Br, Xe E. Rb, F, Kr B. Mg,S,Ne D.K,OCl III(S pts) Derive a relationship between the Fahrenheit and Kelvin temperature scales. (SHOWWORK) 0F: 9‘2ng Chem103 Fall 2008 - Exam 1A October 2,2008 Name /fj ' Section IV(9 pts) Use the following bank of names to answer the following descriptions. Any name may be used more than once. Place the correct answer in the space at the left} A. Avogadro B. Dalton C. Millikan D. Thomson E. Crookes ' F. Roentgen G. Goldstein H. Rutherford J. Chadwick 1. Determined that the mass and positive charge of the atom in the nucleus. tr 2. Elements can not be changed into another element. / I . I L: 3. H13 cathode ray tube showed that a negative particle was part of all elements. 4. He determined the charge on an electron 5. His model of the atom said there was a cloud of positive charge. 7. He discovered the neutron C 3 F 6. I He discovered X - rays. If C 8. His was the Oil Drop experiment ) 9. He determined the mass to charge ratio. V(6 pts) The density of diesel oil 0. 72 g/ mL. What mass of diesel fuel has the same volume as 600 0 grams of water. A5 Chem103 Fall 2008 _- - Exam 1A October 2, 2008 Name 2% ; Section V1(6 pts) A 65.6 g piece of steel Was placed in a graduated cylinder that contains 25.6 mL of water. The volume in the graduated cylinder rose to 34.0 mL. What is the density of the steel? (SI-row WORK) (”#5744 .1: Va? /—/ damp/M 0/“ 7/439 J¢0mL-2J74'Mz:fi¢mz 6-,, 3 453453 ——7—’ :r 243/; 9' ML . AnSWer 2’921 ML V11(9 pts) On my trip to Newark, I encounter 24 traffic lights. Over a 10 day period I was stOpped at: 2 lights, 22 lights, 11 lights, 15 lights, 17 lights, 12 lights, 20 lights, 15 lights, 16 lights, and 20 lights. (SHOW WORK) A)Determine the mean number of lights at which I was stopped. 1,2 3/, 614M 2, arm‘mméx o/M- 5W, AM 5206', [wast/”g = a 4/ 12- 72IMK=22”1:2‘0 CQCMC >CQ71nC/r .2001: é/mrzwflz’ 2‘ fig: [fit-Way “b2; 7 gs/larzusirrHu-l?!‘ ”Mafia/4,1,1 1’46 . (:73 j aflo‘J/‘S—u ? . gig I fi- 1,0 Answer /é //? 575 2,19 2.... .3 31:3)Thestandarddevigtion 5‘ (“L‘le 1x» Sr (MO ‘ 14-! ”-464.44 2.9.44. 5, ”(M-‘7’ r. J. 7/2 _ Ian/L4: "fit! 5-34 9 /_5"‘.../{,.L{a "4-54 {57(- fJ",/[,.I{J “#4 {till- /t. 4ch ‘0"! "" 17-well“ '6 ”9;; 20 ”Md: '3". ’2’ Answer 3‘ 212 20-40“! a {J- lzrfilb ' 22-”. :5 .1. 3}. at, 1101‘! j C) he 90% confidence 11 it 311) _. :65 ,i “0628' — M: 2.: CL: X f” CL: /é - " . m = ‘— g 4/7 )0: 9 D 30-]: X a l3 7 1,, éflf—foZJS/JMo " ‘ Answer /&fl 2‘3 a)!” Mg/u 5.- A? 5 63374 (1m) 15 ChemlO3 Fall 2008 Exam 1A October 2, 2008 Name Section VIII(6 pts) In 0 d English measurements of volume the following are exact conversions: 1 gill = 1 noggin 1 peck : 2 gallons ' 1 firkin = 9 gallons 1 kilderkin = 2 firkins 1 butt = 2 hogsheads 1 peck = 64 noggins 1 hogshead = 63 gallons And we know 1 gallon is about 3. 785 Liters, convert the density of ethanol from 0.78522 g/mL to grams / gill. (SHOW WORK) J??5’“é 40* ){m 0 “’35522il)(mw L/H’I jfl‘e)(//2ku )(T 4/40ij /3;// 907 a: 4.4% cit/W Answer fflifoE/fl - IX(6 pts) Brass is a alloy made up of primarily copper and zinc. Sometimes other metals are added to change the properties. Admiralty zinc is a mixture of 30.00% zinc and 1.00% tin with the balance copper. Given the densities: Cu 3 8.930 g/cc; Sn = 7.280 g/cc; Zn I 7.135 g/cc, determine the density of admiralty b1 ass (SHOW WORK) - fflqc/Iifmclqtfd 0’87,“ (0 3000) [7 lay) +(o,a/oo)[;t 2,52) 7;. {:9 MW) (£91391 ,7. 27/01 +~ 49.072.13.31 +- a. may. I 53¢??le _ Answer £335” ZZMA f )x(2.144)= X(4 pts) Determine the value of the following calculation. (4"? M x 2145/ d 95.4 I: /J. 4650 ' I Answer ' [-572 [(232.45 — 189.8) 5.7642 ChemlO3 Fall 2008 Exam 1A October 2, 2008 Name 2‘ 2% I Section XI(7 pts) There ar two stable isotopes of chlorine 35Cl and 37 Cl with masses of 3496885268 and 3696590259 respectively. What is the percent abundance of 35C1 if the listed mass of chlorine on the periodic table is 35.4527? (SHOW WORK) ' grch-QCSZQ;/ IMXL‘EHWM gage/~X a. m1.) ( m...) 4 ts...) (me) 3.5744531? 2.37.74, 745515—26}; (— (I—X) (:76, ?é67025§j .‘ /. WW x = 25/3 250 Answer: 35C1 = 2:”: 77-72 :0 x 3 a way/f? ' XI1(6 pts) A'compound with the formula X304 was found to contain 72.36 % X. What element lssfigwwosk) 7474)‘ ‘7 (4}27-MH’0) WX): fiZVfé %0:07;,44% fl ‘74...»in 'W‘t’x flaw“ m)? 5”” ' MW X awn/(K ’ {—42% .:.- ffifl" ms”? ? 0 .= like 4 ‘ - mes/10M fl f-flc' WV-lflagyré‘izz /.?¢7?m“{9 fl lé.0'0 ' - Answer_t£____ XIII(6 pts) 45.36 grains of the anhydrous Ca'SO4 was exposed to water vapor. After exposure, - the sample had amass of 48.42 grams. How many waters of hydration are there per mole of calcium sulfate? Ca = 40.01 S a 32.07 0 = 16.00 H = 1.01 (SHOW WORK) 44.507 :C’a/czwu Stir/64¢". 3 440/ 4' 32-4? + 40447)) 430055790. _ £6240“ 453%; fix/Lo—e l/Jm/z —4/.s?a%": 3,00; s #236 M a J ' - ' ”M” (t dataltgm” AnswerM/MWW .1 yam/yo =. (3.019;) /——-—-—~””J):p./90w~t’ éflv «2’40- '. xxo? Chem 1 03 Fall 2008 Exam 1A October 2, 2008 Name 1%? Section XIV(6 pts) What i the mass in grams of 6.37 x 1020 molecules of sulfur trioxide molecules? (SHOWWORK) . . Sax/firJ-Soj :- 32.07/- 3m 00) = fir”?- 4’”%aewe. 1.0 ‘ . 9- m “6%: w (Sf/:0 G [4(é 3,1110 144 5); 0 :5 )_ fl,/jocC/Oj&77 Answer 67" 0‘?L/¥' a :. XV(8 pts) Vanillin, the chemical 1esponsible f01 the taste and smell of vanilla, is 63.15% carbon, 5.30% hydrogen and the remainder oxygen. What' IS the empi1ical fo1mula of vanillin? __ (SHOWWORK) C:12.01 H=1.01 O=16.00 70 0: /¢Z?. 00" ég A" -5 303 3/111 flea—(aw /m&sampu 0 LG" fig; Wag (cs/53c) (ml): azfiswi/Aflzsg,“ % “3 1?. of 5 37M)” (‘5 305)(/:4 j)?: Jizt/ya’wJ/MWL :2.156 %43 j _ {‘3 a WJO (”fig/M) Z4): /~fflzmM//'WZ" ‘ / fl! ”5 AHSWCYW XVIO (20 pts)A. Place the correct name of the species in t e space provided: . 1. 1-110; 4.9 ac/gas god 6. (310" p ”in AW ‘ . Mg12Mé§aeggum 10311176 7. N02" Mari/71’ (W 2 3,-NH4+Qmflmlc}m gm} 8. F62(303)33Q rri'c sin/£314 0r xrmfllasulfifi’ 4. W Qfifinggaim 9. CsOH fies/am ga’rflrda 5. Sb QQ $5431.? 10. N20; mic/grow #fiecztbé’ B. Place the correct f rmula for each of the following in the space provided: . 1. silver sulfide .5 6. Molybdenum We ,2. cupric perchlorate 6“. C50 7. Carbonic acid -/ CD __ 3. alunrinurn ion Ag +3 8. Barium ion 53/3. +1 4. potassium peroxide /( 0 9. Azide ion_fi___3fl___ 5. cyanic acid ff 0 C [52 . 10 Calcium cyanide €44 CD); 8 fl ...
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