Chem103F07T1 - Chem103F07 Exam 1A October 4, 2007 Name Lab...

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Unformatted text preview: Chem103F07 Exam 1A October 4, 2007 Name Lab Section 1(23 pts) Piace the correct answer in the space at the left {Q' flags/)4" 4. A property that is independent of the amount of material present is known as an (intensive/extensive) property ‘ ka/s e 5. True or False: the SI unit of volume is the Liter (L). ' (a 7‘25. W5 6. The existence ofN02 and N203 is an example of the Law of 713 7. The particles and a M j anew I ‘ V1 @449 M3 8. res1de 1n the nucleus of an atom. 4, Crawlers 774.9! 3 on 77% E I, 5&7 The first evidence of subatomic particles, came from experiments with Q,“ a M 5 10. All atoms of a given element have the same number of . - 3 q . . . ' A: «- 7a? 1" 9 11. In the nucllde auric — 197 ion: The number of protons 7» , e / / 87 12. the number of neutrons = , Z (I 13 and the number of electrons = ” Z 14. The simple anions formed from elements in group 16 will all have a charge of are called I d or Car/9m» 11- ,____,___.__.__.__ 16. The current values of mass are based on the mass of the specific nuciide ? /5 0%0K5 15. Nuclides with the same number of protons but different number of neutrons z . Z- 17. Which column of the periodic table will typically form ions with a 2+ charge? 3 / a 3 ‘ _7L_£__ 18. Write the nuclide that has 15 protons, 16 neutrons, and 18 electrons. 1 / Chem103F07 Exam 1A / October 4, 2007 .46 E E 2 Lab Section w 9. In a chemical reaction, the reactant that is completely consumed in a reaction is known as the Q d S 20. In the state of matter, atoms are far apart, free moving, and disorganized. 5 W S u I 06‘" 21. In nomenclature, what does the prefix thio represent? 8W1 Eff l cw} 22. The chemical formula that gives the smallest whole number ratio of elements to each other in a compound is known as the formula. 5% M. 4-6. . . . ——7—L-—— 23. A compound that contains intact, removable water molecules as part of1ts structure is known as a C 11(8 pts) Place the letter of the correct answer in the space at the left. 1. An element can NOT a. be part of a heterogeneous mixture b. be part of a homogeneous mixture {2. be separated into other substance by chemical means d. interact with other elements to form compounds e. be a pure substance 3 2. Which of the following in NOT an example of a chemical reaction? a. dissolution of a penny in nitric acie b. the condensation of water vapor c. a burning candle d. the formation of polyethylene fiom ethylene e. the explosive reaction of hydrogen and oxygen Q 3. The law of constant composition says ' a. that the composition of a compound is always the same b. that all substances have the same composition c. that the composition of an element is always the same d. that the composition of a homogeneous mixture is always the same e. that the composition of a heterogeneous mixture is always the same D 4.‘ Which of the following is NOT an intensive property? a. density b. temperature C. melting point (1. mass e. pressure Chem103FO7 Exam 1A October 4, 2007 Name Lab Section a 5. Which of the fell wing in NOT true of a solid? 21. it has a fixed volume b. it is generally rigid c. the atoms are closely packed but disorganized d. the atoms stay in place e. the atoms are not compressible C 6. On which temperature scale(s) is one degree the smallest? a. Kelvin b. Celsius c. Fahrenheit d. Kelvin and Celsius e. Fahrenheit and Ceisius C 7. Which of the following is NOT one of the postulates of Dalton’s atomic theory? a. each element is composed of tiny, indivisible particles called atoms b. all atoms of a given element are identical to each other C. during a chemical reaction, atoms are changed into atoms of different'elements d. compounds are formed when atoms of different elements combine e. atoms of a given element are different from those of other elements E 8. Which of the following is NOT an indication of a chemical change? a. production of a gas b. change in heat and light energy 0. formation of a precipitate . d. change in color. e. change in state SHOW WORK ON ALL PROBLEMS FOR FULL CREDIT I 111(5 pts) On vacation in Colorado, you find a nugget of gold that has a mass of 2.23 ounces. Gold is currently selling at $651.00 US dollars/ troy ounce. How much is your nugget worth? 16 ounces = 1 lb; 1 lb = 453.6 grams 1 troy ounce = 31.1035 grams Chem103F07 Exam 1A - ZL/ October 4, 2007 Name Lab Section IV(4 pts) Determi the correct answer: ’ a (19.07 + 7.4) _ /fl’5... “M. 4‘3: ' 2.513 — W 07' 5'7 3 2 b. (0.002843)(l2.80184) z / >00 // 3’ 23 [0 0.00032 V(6 pts) A solution with a density of 1.320 g/mL and a volume of 46.0 mL was mixed with a second solution with a density of 1.005 g/mL and a volume 52.5 mL. What is the 1 density of the mixture? )"fi NT; (Agzowa)/Wc0hfl.l: 60.;2j 7' VT— 005’fi/MLl/fz_5%4)r J21:?' #3, I , VT. ,3 44.9,”; #522me _- mg a /./5z;%gL VI(6 pts) In Alaska in winter, a temperature was measured of e 40.0 BF. What is the- temperature in Celsius and Kelvin? 9C = ("JV-323% 2 (~40 e32)(%): nut/OT. K: “C; 071;: ~40fw793 4‘— X33K 9 Answer “0/0 C Answer '73 3 K VII(4 pts) The formula of a salt is X012. The X ion in this salt has 28 electrons. What element is X? (explain your reasoning) “(A _.. K2"- def was SOPVW‘W-S & fix Jar/(1%) Answer 5"- 4 6 Chem103F07 Exam 1A October 4, 2007 Name Lab Section VIII(6 pts) The following information was obtained for the element K. What would be the listed mass for potassium. Isotope Atomic mass (amu) Natural abundance (atom %) 39K 38.9637074 93.2581 40K 39.9639992 0.0117 41K 409618254 6.7302 ) flré; 3 (mass-)9”— (J‘mcz){massa) % (MJOMMSS 2 {9. $3 2 saw) (32?. $933024) ,3 (a. on all?)(jf,7‘d.ifi72) +{MM 74oz) . , (497mm) 5 3g, 33w'}3z/ ,1. o. cog/eq’rfl‘rfé’ +2, 2529.12 l s 3?] a fat 926:6 " Answer 3;: 07ft; IX(2O pts)A. Place the correct name of the species in the sp ce provided: 1. H104pem'dlz and 6. C10' fig’Qog/umslf mic 2. NIng ma§msmw QU/um'afl 7. so;2 ngfi'fi [wk 3. NH4+ gmmamm If»! 8. F6233 er‘t‘a SUI—Géal or IranClfiSMM‘é’ 4. Se Je/emum 9. RbOH rulélklsam égfia/mcrtf/ 5. Sb awning] 1091203 dinghy” Jrimmfiz B. Place the correct ormula for each of the following in the space provided: 1. silver oxide 4 a [2 6. Tungsten 2. cupric nitrate Cu. g N03 )2 7. Carbonic acid Ag (’0 3 3. aluminum ion A l +3 8. Barium ion 242* 4. sodium sulfide N4 5 9. Azide ion Q“ 5. hydrocyanic acid /a/CA/ 10. Sodium peroxide lute 02 X(4 pts) Balance the following reaction by putting the correct value in each blank. / Fe2(SO4)3+ / Z K(SCN)-) Z KgFe(SCN)6+ 3 K2304 Chem103F07 Exam 1A 7% October 4, 2007 Name M Lab Section Xl(7 pts) Determine the mass percent composition of glucose. Cal—11206 WM.) 7—“ /80, A? =12.01 H=1.01 0:16.00 C . 9”“ L z. 602.01) XM): 37’???) M“) Moo/c? IZCN”) x/fp .1: é, AnswerC: 6) “W I ' % 0 :2 L0 L. &(/é.w) f3. gar/OZ AnswerH: é: 3 D 6) MW (#4:? Answer 0: «5’3 J 2 J“ 29 022 /W--0u -3¢-fi’ —~ 4. .73 2. .5‘2. 20% 2‘ XII(6 pts) What is the empirical formula of a compound that contains 29.0 % sodium, 41.0% sulfur and 30.0 % oxygen. Na E 23.0 S 3 32.0 0 = 16.0 g 3:. st»: in A’st M7); Jayne. My, 2 2 Midi/Q: J: /,260//'u0 3/]; .22 23-0 M W»! 55‘ 60-07 J: /,ZJv///.Z,c.o 3/.0&=/)2-‘2- 32-93%” /[/a 5' 0 A m4 0 --= .5103; - /. J'Jr/Azoos/A/J's/d'az. gym—HT} . J " XIII(9 ptsffiig reaction of 35.0 grams of aluminum and 25.0 grams of oxygen gas produced 35.0 grams of aluminum oxide. A1 = 27.0 0 = 16.0 A1203 = 102.0 fly 0 ,2 A1 flog —> A1203 fl 4A? 7‘- 302 --w JAILOJ 3 5% Z- . A. Determine the limiting reactant. VIM/419: {flit :flii’émw’ 31.04%»! . W»! U :976’30 3 2%sz (/mwwmmi) 3 0,2,) 3 5;. filler“); AnswerdgL '47? M £49.02. B. Determine the % yield of the reaction. we. fflmafiru 7,4,2 .-.~ 42;?) (224/205) (Mu/Mu, 5? Br; ‘17“ I g . r W; b "' AV M1) 2/?! “7‘7 " 35.0 45700525 Answer ’— 0 =r _.__.....j W 2 % éeWo Chem103F07 Exam 1A )/ October 4, 2007 Name Lab Section X1V(5pts) A com und Fe2X3 contains 53.8 % iron. What element is X? 5/422; )( Amaze-If”; 3 {3.40; Fri 46.15 X 55% Fe mar; Inch-(X 4"35)‘ = 32.1157 $07 More 3 “WWW” rm” Answer 32; 0 XV(5 pts) 5.40 grams of CaSO4(s) was exposed to water vapor. When the system reached equilibrium, the sample had a mass of 7.52 grams indicating the formation of a hydrate. What is the formula of the hydrate? // o 3 3 5'2 -5“ do "' 4 Lu -'-" ' 2' ' v -- O / l j WMCaJO = 7W)” __ fl,fl3f65’M‘1fl/0396J’ 2/ 3””? Pia/7 } IWJ‘ (/VWI', -zfl=5 314"!!!) 04' ZJJZ " (J. //}71/0'037%Answer XVI (6 pts) In a determination of the molar mass of magnesium, a student obtained the following data: 24.01 g; 23.72 g; 20.91 g; 24.81 g; and 23.75 g. A)(1) What is the range of the data? {BM}! 3 fix ~10 = JfiiJ/d—Zbrfl :2 if” Answer B)(2) What is the mean of the data? ‘ '" : ’ ,7 _ (/_ I $5315” If (425‘ am At? lj‘flgra/ x W6, gag-4:9, =£7¢a/«23.a%.;o =— M ‘9' 2‘7 :24. 072:- ' y z I : ,12—2 ._ :gflr 72/ $5,231); ° 6" (23 ° WM" / Answer 97% 0 31 “I Q; =- évé‘/ .‘. 295/ C)(3) Lathe standard deviation is 0.502, determine the 95% confidence level for the data. = X.:‘__¢:‘_:§ Z.‘=3Mct’£«.v’leai< a 1m 3 J H (any 0.5’02. “ “I”: 7$¥~ Answergwyi am 3‘24de ragga/f .fliBezsw gag-M f” f, ' 0 I'- Zjiqel“ Ric/4f we 2... 7 a" ...
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This note was uploaded on 03/01/2009 for the course CHEM 103 taught by Professor Kramer during the Fall '08 term at University of Delaware.

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Chem103F07T1 - Chem103F07 Exam 1A October 4, 2007 Name Lab...

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