exam3key2010sp0001

exam3key2010sp0001 - Nam K6 V Chem 10 Spring 2010 WP 7:45...

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Unformatted text preview: Nam. K6 V Chem 10 Spring 2010 WP 7:45 — 10 am See 1315/1316 23 April 2010 G. Strathearn EXAM 3 Instructions: 1. There are 100 points in this exam, with five (5) exam pages and 16 questions, including the extra credit problem. Check to make sure you have all the pages. You also have two pages of scratch paper, tables and charts, which you may remove. 2. Put your name or initials on each sheet. Make it readable! 3. For each question below, provide an answer. I a. For multiple choice questions, place the correct letter in the space to the left of the question. Ifyou feel more than one answer is correct, put the best answer. The letter must be clear. b. For all others provide an answer in the space provided. Ifyour answer can't be easily read, it won't be graded — and gets no points! 4. No cheating. You may have only a dictionary, writing instruments, an eraser and your own calculator. No other help or talking. You have 65 minutes. When you finish the exam, you may leave. 5. Please come to the front of the room with any questions. Some conversions and formulas 18°C = (°F-32) °C = K—27 3 1” = 25.4 mm 1 mole of things = 6.022 x 1023 things (Avagadro’s number) 1 gal = 3.803 L 1in= 2.54 cm 1 yd = 0.9144 m D = rn/V 1 lb (pound) = 0.4536 kg 1 lb = 16 oz 1 mi = 5280 ft Density water = 1.0000 g/mL Specific Heats water gas = 2.02 J/g-K, liquid 4.18 J/goK and solid 2.06 I/goK AT: /f00 For 35 g of water, 5%hat is the final temperature if 1800 J is added? A. Multiple Choice Questions (10 at 5 points each or 50 points total). £41. 1:2. a) 19°C b) 27°C c) 29°C d) 41°C e) 29°K Which ion has the smallest diameter? a. N‘3 b. 0'2 c. F'1 d. Na+1 @ 3. Of the following five elements, whichhasthe highe ' ' ation energy? a. Na b.B c.C d.Sn mag? The orbital which fills after the 4f orbital is: a. SS b. 4g (1. 5 f e. 6p 5. A 225g sample of water cools fr °C to 224°C. How much heat, in kilojoules, has been lost? a. 0.298 KJ b. 25.6 K] c. 49.1 K] d. 98.2 K] e. 1,875.6 KJ How many unpaired electrons (one electron in an orbital = unpaired) does magnesium have? ". i : Prepare an orbital diagram.) @ b. l c. 2 d. 3 e. 4 em» tn 62:.fm137’ (3 5 )[171 wig? . we: WWW .—-— MN: 10 7 Which is the correct Lewis Dot Formula for the OF2 molecule? o. O. , I. " at. 0 .F. _ , I , o \ ' .‘ %.3l=.:<->:l=.3.l=.' .. n w bl. Q. .0 I. O. O. O. F F o 00 00 l 72 8. Consider the combustion of the butane using the following unbalanced equation. J} a I 02 C4Hio 02 C02 + H20 (UNBALANCED EQUATION) In the combustion, you generate 7 8.3 g of C02 from the complete combustion of butane in excess oxygen. With how much butane did you start? a is L Inn/(m inn/[MN IEZCW/o 0%)?” W760» mou)//m/cy/Ao d. 103g e. 1140g E 9. What is the ground state electron configuration for phosphorus? 1322322p63 szw 2‘ 1s22322p 1 2 p62??? 0 1522322p63 sz3p3 D 0999‘?” H U! ._.a $221,234; '9 10. According to the following equation AgN03 (aq) + NaBr (aq) % AgBr (s) + NaN03 (aq) how many grams of silver bromide will be produced by the reaction of 2.3 mol NaBr? (Formula mass of AgBr = 188 amu) ~ a. 8 g b. 0.0122 g c. 81.7 g d. 432 g e. 944 g Short answer Provide an answer to each question below. Work Required for Credit (50 points total) 11. Using the shape table in the chart section, give the Lewis structure of the following molecules. Indicatt resonance, if any. (10 points) S_i03'2 20131: «t +b)(°)’rzzl‘f ,2/ = Cl " :pr. 3". : :F: cxcls 6'7 I‘ H H {Ch \‘ ‘c V6) ammo 12. Magnesium reacts with nitrogen to form magnesium nitride. How many grams of magnesium nitride will be formed fi'orn 0.0705 kg magnesium and 88.6 g of nitrogen? (11 points) $9.5} f/néy Mo IV! 1970/ fl], A/L MILE/71;”; a (filsf/y)(?{4tfi{Z/flf)[4m°/fl/I )0M0//¢31/» (WW MWMJWX/WL): 32a. j/ZM/L Mass of magnesium nitride formed: , g 13. Explain in 35 words or less the difference between a polar double bond and non-polar single bond. (8 points). (8 W277? @ dicfi’mf Z all! VI / 4/? f/I/n/ // @ e/chf f/jflré 4076 i6? QMM/ “[5 Wt” [Wk 0/ V ® COUQZ’nf/éonr/K ) l4. Explain using quantum chemistry, in 35 words or less, why vertical assemblages on the periodic table . have similar chemical characterisitic. (7 points) key/DIV”? [Diron Alli/E, fmw Mill. 6/ 15) Submitted by a student: Solid rocket fiiel used for the space shuttle is aluminum metal and. ammonium perchlorate, with iron (11) oxide as catalyst. The products of the reaction are aluminum oxide, aluminum chloiide, nitrogen monoxide and water. (14 pts) A) Write out the reaction and balance the equation. B) If you have 1.75 kg aluminum, 7.00 kg of ammonium perchlorate and 1.06 kg of iron (II) oxide, What is the theoretical yield, in kilograms, of water. C) If you collect the water during a test fire, you obtain 1.5825 kg of water. What is the percent yield? Note: If you have a problem balancing, assign coeficients of 1 and work the problem. .3 A15) till/Hal 0/07 5:49”? ALD; + Al cg ow rm [75:9 $009 :1 . Z I. I 0ewl%>%°)(%£o¥ y: ./ { Z 0017 [ma/0,, I]? Zéjofl/hzg%%)fié 4m Theoretical yield of water: / mm ~——7Z- :— . l I? I/ X/UDZ if. 3% Percent yield‘gl 5 .- 3"? % 16. Extra Credit (8 points possible) You drop a 75.0 g of a metal at 188°C into 235 g water at 220°C. If the final temperature of the system was 29.7°C, what is the specific heat of the metal? _ QM '2 Gm) “Sm/VIM 67,; 1 5‘wa ATLI/ G’SWMWAKJ (:1 a SH ,MH A771 gill/MOUIsz ' : a: 477,44», ...
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exam3key2010sp0001 - Nam K6 V Chem 10 Spring 2010 WP 7:45...

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