Chem103F06T1 - Chem103F06 Exam 1A Oct 5 2006 Name Section...

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Unformatted text preview: Chem103F06 Exam 1A Oct. 5, 2006 Name Section FOR FULL CREDIT SHOW WORK ON ALL PROBLEMS 1(9 pts) Place the correct answer in the space at the left. I // 7‘ 1. A proton is the same as a hydrogen nucleus(the hydrogen ion), the complete W— nuclidic symbol for a proton is M 2. Two nuclides with the same number of protons are called 12.. g 3. All weights in the current periodic table are based on the mass of the specific _&___.. nuclide g3 é: 022 V "9‘” The value of Avogadro’s number is L ’ 5. 1.0 um(micrometer) = m(meter) 9/2 ”1&1; 6. The three fundamental particles of an atom are )3ng 7. , and 5:101)“; Mm Specific compounds are made up of a specific ratio and kind of atoms. This is 0W- 0!) W. I WNW [01’ 49 or called the Law of HUD pts) Place the letter corresponding to the correct choice in the space at the left. 5 1. The common species present to all acids is? A. H2 B. H‘“ C. OH' D. H20 E. HCI "D 2. How many significant figures are in the calculation: (4.0021 — 0.004) / 2.3750 A)1 B)2 C)3 D)4 E) 5 p 3. Lead melts at 327 “C. What is this on the Fahrenheit scale? A) 620.6 B) 600 C) 895 D) 621 E) 547 / 103F06 Exam 1A Name 3% Section i g 4. A titration was performed to find the concentration an acid and the following data was obtained: Trial Concentration l 1.25 i 0.01 2 1.24 x 0.01 3 1.25 :1: 0.01 The actual concentration of acid was found to be 1.100M. 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 A... 5. The density of gasoline is 0.7025g/mL. When water is added to gasoline: A) it will float on top 13) it will sink to the bottom C) it will mix so you can’t see it D) it will make you car run better E) it will float in the middle of the gasoline D 6. On object that has both definite shape and volume is in what state? A) plasma B) liquid C) gas D) solid E) condensate Z) 7. Which of the following pairs of compounds can be used to illustrate the law of multiple preportions. A) NH; and NH4Cl B) 2.1102 and zanc12 C) H20 and HCI D) NO and N02 C) E) CH4 and co 8. Which of the following statements from Dalton’s Atomic Theory is no longer true based on modern atomic theory? A) Elements are made up of tiny particles called atoms B) Atoms are not created or destroyed in chemical reactions C) All atoms of a given element are identical D) Atoms are indivisible in chemical reactions B) All the statements are still true . One molecule of a compound weighs 2.03 x 10 ‘22 g. What is the molar mass of the compound? A) 48.0 B) 92.1 C) 114 D) 122 E) 248 103F06 Exam 1A Name Section fl La 10. The limiting reactant in a reaction A) is the reactant for which there is the least amount of grams B) is the reactant which has the lowest coefficient in a balanced equation C) is the reactant for which there is the most amount of grams D) is the reactant for which there is the fewest number of moles E) is the reactant that will be completely consumed in the reaction III(8 pts) Match the name from column B to the statement in Column A. Names may be used more than once. Place the letter from Column B in the space provided in front of Column A. Column A Column B B 1. Proposed the “plum pudding” model of the atom A. Chadwick 2. Introduced the concept of the B. Thomson nuclear atom C. Crooks discovered the neutron. “5...... L 3. D. Roentgen 4.. 4. Proposed the name of the electron E. Rutherford D I” _L ' 5. Discovered Cathode rays F. Millikan 6. Determined the charge to mass G. Stanley ratio of the electron H. Meyer 7. Discovered X—rays I. Faraday 8 Determined the charge on an electron IV(7 pts) Express the acceleration of gravity of 9.807 m/ see2 as it! hourz. 1 ft = 12 inch. J Answer fI/A'Zfl )0” 15712 “fil/ L / 103F06 Exam 1A Name f? Section V(8 pts) 54.0 mL of solution A (d = 0.9726 g/mL) was mixed with 59.0 mL of solution B. If the density of the mixture is 1.21 g/ mL, what is the density of solution B? Assume the volumes are additive. firs/Sr M: J MB VA DA a V9 D3 .- E} l 1 III/.7! # l/My ’ VA»; V3 VA J, V5 /, .215, .. (Wu WK ML (I915! gruff fl)m[. /.?/.-‘;23 r (5340) (awed/£31595”. 0x gfiigfié : d7: 02‘ X -’~‘ A49? ? 54441 a? 5 f “(M pts) Nomenclature Answer /’ ‘S/é /M A Place the correct complete name or symbol in the space provided . .13 1. Be gfl’? /fl6/m ll. ferric ion £6 2. Ge 2* awful/y 12. cadmium ion (id * 2 j ' . . 4 3. Y yfl’lum 13. Silver Ion - . 5 4- 4. magnesmm [:7 a 14. cuprous Ion (2,; 5 5. potassium K 15. stannous fluoride jg F3 6. sodium N4. 16. hydrocyanic acid g (3/0 7. azide ion W; 17. calcium hydroxide €44 M2 8. sulfite ion 322;?" 2' 18. ammonium perbromate Mg! Erfli 9 thiocyanate ion , jg; A) g 19. nitrous acid #W02 10. carbonate ion CU? '2‘ 20. CrS {’fffiWmSJu Ahab 0r (’ 740mm man (If) far/$30 VII(4 pts) Balance the following equation with smallest whole numbers. / Ca3(PO4)2 + 3 H2804 '9 j CaSO4 + g H3PO4 103F06 Exam 1A Name Section VIII(10 pts) Fill in th following chart Number of Number of Number of Symbol Protons Neutrons Electrons 3 2.. .— 3 1 5 A 39 Z 0 1X(7 pts) Gallium consists of two isotopes gallium-69 with a mass of 68.95 and gallium-71 with a mass of 70.95. If the average mass of gallium is 69.75, what is the % abundance of gjllium-69? Ag Man : (.flm 4904mm 9;) 7L (M 9/)(Még; 2/ Mgr : (X) Mijr) ,1. 0%) (5mm of?!” w” éfwffx rWVfJ”““?/A§5“X Z.WX : A20 X : fl. L 220 AMA X(6 pts) A compound XC13 is 63.6% X. What element is X? 63.4%; An”... my 67%». 35. MC? .2 43.4; x) 34.4% M. : 65.3%??me I Answer % $0; 43,404; X 55.3%? MW!" (m 35;? y. astaflgflfl //a%./: Re flr3L/zfima’ 103F06 Exam 1A Name Section XI(7 pts) A compo containing carbon, hydrogen and oxygen is 49.32% C and 43.84%0. What is the formula of the compound? fngA/W /i‘Z/ éfl’hfioé’ Z/f: f” " a C“,Z& VflngXC/f/Mfij/ZJL/ M1723 z/msg/fijz—‘fifide fl 09 ‘/Jfl/0}me’ .. M 914': /‘>‘2”2 : A M) ’W .2 M /; MW/{Z}: ”Md/2W “’7” 5 :lngC /ZmV/0/j/”‘7’b/ Answer flz/épg XII(7 pts) Using the following reactions, how many moles of 02 are required to produce 5.00 kg of Fe 3 20+02 -> 200 Fe203+3CO —) 2Fe + 3002 (95:1302 «a M 07%}9 1W «9 4,4519% 6’0 6030 2.25:0 W72 1% w Answer é 72: //77g£éz XIII(10 pts) Propane (C3143) burns 111 air to produce C02 and H20. If 55.0 g of propane burns in the presence of 192 g of oxygen, A) What 13 the limiting reactant? B) How many grams of the excess reactant remains? C3H3 + 502 ‘9 3C02 + 4H20 JEW XXV/1M} ‘ I V54”; ' ”gag/MI”! /f2 0; /M~j 3 é/wufl 5101/?Mu/{1/4/fl; ,5 6129525, _ 32,0? Hm»! (9' Answers: A) Limiting reactant 2 .2V? r/{g/ 01/0 ramso excess /? 43/7/ Mrs/6’ at! a “’- W/lzt’flrfl/ > MM {W 5 LUZ». 103F06 Exam 1A Section XIV(7 pts) In th reaction: A14C3 + 121120 -> 3CH4 + 4A1(OH)3 ; 12 g of aluminum carbide produced 3.0 g CH4 , what is the % Yield for the reaction? A14C3 = 144 CH4 = 16 H20 = 18 Al(OH)3 = 78 3. 0 «pt? XV(5 pts) A student determined the following values for the molar mass of Cu. 62.21; 61.37; X/W 5" 7(2) Ansv\.rer_th_MZL___~ 65.45; 64.11; 60.10;65.33. Find: A) the mean of the data; and B) the relative % error 51”” '5 3306.5"? /4 2/37/91; Wm : 4.37. M”: 43. a; 64m" {/{x/t/l -- er) Para/a Vii/W 63. 6‘J”—éi./0 5.3, .53" X/W pr ~= 0.44% raj/76 Answers: A) Mean 43: / 0 241/ B) %error 55'77/ 7V POINTS PAGE 1 42 PAGE 2 5 PAGE 3 / Q PAGE 4 .3 2 PAGE 5 23 PAGE 6 a? ‘7/ SCORE PAGE 7 /»7—/ 125 ...
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