Exam 1 - CHEM 1314 Sections 006—015 Name ~ xam 1 Dr....

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Unformatted text preview: CHEM 1314 Sections 006—015 Name ~ xam 1 Dr. Stacy D. Benson ‘ September 14, 2006 in new" #5- rrrflw w : w 2 i‘)a"a~¥f§&i’““fiii~1“tag’ fit“~*-~r5:“5?. iTiAwsC-Ksfitfi “w «:Li’xna a imn‘fipr'hw'i «r: unit a. ‘ 5“ Section 6 (Benny); M o :5 (.2. o) .05 (:3 L; (:2 m :3 Section 7 (Megan); Tuesday 8:30—10:20 Section 8 (Zafar); Tuesday 12230-220 Section 9 (Danny); Tuesday 6:30—8:20 Section 10 (Eater); Wednesday 830—1920 Section 11 (Megan); Wednesday 8:30—10:20 \/S¢ection 12 (Zafar); Thursday 8:30-10:20 Section 13 (Megan); Friday 8:30—10:20 Section 14 (Danny); Friday 8:30—10:20 Section 15 (Voikan); Monday 8:30-10:20 ENSTRUCTIONS: 1. Be sure your name is on the test and your section checked. 2. This exam consists of 7 total pages. The last contains a periodic table, usefui equations, and conversion factors. Make sure you have aii pages. You may tear off the last page for convenience. Show your work for fuii credit. Point values are shown at the end of the probiems. Reiax and do your best. if you are unsure how to work a particuiar probiem, skip ahead and come back. You have 1 hour, do as much as you can. 9.43.09 CHEM 1314 Page 2 Exam 1 1. Perform the following conversions. Be sure your answer has the correct number of significant figures. (15 pts) 76 Convert 8.4326 lrg/mm3 to mg/m3 / 5 g . i r , 44' .i 5‘ ; k “*3 if" 5"" " “i 9- l €“"""-"z a. .s “Q‘s-3, *5. 1 2.0g e K? : 2:1“ $0.2m {af‘si’nf‘ffi‘ ‘ t wage} as?“ j « i; A“; Mg m E r ‘ g 3%,, r -: ; .w v “ .3; are. .w ‘ 1; m: " 9 V: “ . . 1m ‘1 l gwflfiw‘w KL/ of A sphere has a diameter of 17.3 ft, what is its volume in liters? The volume of a sphere = 4/3m3. (7: = 3.14159) _ a? / 5 Arrange the following by increasing number of total atoms: (5 pts) A) 0.50 mol H20; B) 23 9 Na; C) 6.0 x1023 N2 molecules .zasz-MW“MMCV ,www’ ‘ . '5‘ / 4:. A g t ‘ \ 3"“ fl “1 / 3. Round the following numbers to 4 significant figures (3 pts) 7/ 0900428534 3 8) 10003.26 / 2’ 1 75 11;: ff) 20.0007 CHEM 1314 Page 3 Exam 1 . A compound that is composed of carbon, hydrogen, and oxygen contains 60.6% C 7.1% H, and 32.3% 0 by mass. The molecular weight of the compound £3 297 g/mol. / 7 What is the molecutar formula? (10 pts) r ,« y: V‘é ,~ '. 1 I \hl “ f. . v “32,, (as > r} I ‘ 3» M}, Lg: I) ,3, it y hit my 5/ L...“ r' / 5. Balance the following reactions. Make sure the coefficients are the smallest whole ' numbers possible. ’9 pts) A) El‘jNaNs(s) —> leNais) + fTN2<g> 3 % C3H8030) + :302<g) —> ffcog(g) + HZO(g) , C) H28(g) + ,jgg'r'aOH)3 a Fe283(aq) + ,QZHZOG) 6. Which of the following are decomposition reactions? (3 pts) 1) CH4(Q) + 02(9) ‘7‘ C302(9) + H20“) 2) CaO (s) + 002(g) —> Ca003(s) 3) Mg (8) + 02(9) —* M90(8) 4) PbCOs(s) —> PbO(s) + 002(9) A) 1, 2, and 3 ,3); 4 only iti”) 1,2,3, and 4 D) 2 and 3 E) 2, 3, and 4 7. What is the mass % of C in methane (CH4)? (3 pts) A) 25.13 a) 133.5 092.26 )7.743 CHEM 1314 Exam 1 Page 4 8. Comptete the totiowing table. The sampie mass can be used to find the number of motes and the number of “particles” and vice versa. The moiecular weight can be found from the tormuia. (6 pts) Formula Moiecutar Sampie Moies of sample Number of atoms, 1 Weight (gimo!) mass (g) (moi) moiecuies, or formula units NaCi 58.44 13.5 3.0599 _ _ t r416? ceHg' t 234 as _ Ai(OH)3 ' /~_ "’ 1.74 x 1072 -\ 9. Fit! in the gaps of the foitowing tabie (use the present data as a guide) if? 0. Dis} Symbol 75A53' 4“; [1/ +2 § 7 it" Protons :5; 283‘ Neutrons 31 Eiectrons 26 Net Charge T V ‘ /i—L 33%) ?8@7'Z: 10. The eiement Z has three naturaiiy occurring isotopes. The masses (amu) and %€ +c/u 26 abundances of the isotopes are given in the table beiow. What is the average atomic mass of eiement Z? (6 pts) isotope Abundance (%) Mass (amu) m V56. CHEM 1314 Page 5 Exam 1 11. Complete the following table (10 pts) Name of Compound Formuia of Compound ionic or Constant magnesium carbonate . octane /3 i i; i i , L. F8203 Fer}? Osgbkz 12. Complete the following calculations and r ort the answer to the correct number of significant figures. (9 pts) [(2 05 / Z (0.002843X1280184): N 7‘ V 0.00032 i‘ ‘ W /Z )5 (2115~2101)x(5.11+7.72)=h X 3 g [5; ‘ f» ‘ (11.13+2.6)X10“‘ _ _’tm . ’ 3 7f (loses—31.9)x10'5 2 5 $5745; ~ 0 It. 1,; 79-5 13. A cube of an unknown metal measures 1.61 mm on one side. The mass of the cube is 36 mg. Which of the following is most likely the unknown metal? (5 pts) ‘ Metal i Density (gicm ) ffiw‘ \ i ' " rC‘o‘i‘fi" Iur'n i ~ Janina 1' 2H5 CHEM 1314 ’ :t Page 6 Exam 1 C 6} .7 I, (N I I 14. Which of the following are chemica‘Kprocesses? - (3 pts) n 7 ...— i. rusting of a nail “xi 0520‘“ 2. freezing of water (Jqu ,0 Pm”er 4‘1 ._‘=3. decomposition of water into hydrogen and oxygen gases 4. compression of oxygen gas A) 2, 3, 4 B‘ i, ‘3, 4 i, 3 L 2 "‘E) 1 4 15. Which of the following is the formula for chlorous acid? , HClO4 )jHClOEa HClOg ) HClO E) HCl Extra Credit , 1. Give the name for the following symbol and determine if they are metal, nonmetal, or metalloid. (3 pts) f. , i i _ , , _ 9—. to . . » ‘ .‘ c , v , x > I fining“? b) 08 ’ C , .7 i C) M“ i 3 , , V 2. Vanadium has two naturally occurring isotopes, 50V with an atomic mass of 49.9472 amu and 51V with an atomic mass of 509440 amu. The atomic weight of vanadium is 50.9415 amu. The gercent abundances of the vanadium isotopes are ' % 50V and - ' WW. (3 pts) Page2 Page3 Page4 Page5 Page6 EC TOTAL SCORES '7 l5 [3 [i O + L5 @ <23) <25) (22) (24) (6) (6) "3 . ...
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Exam 1 - CHEM 1314 Sections 006—015 Name ~ xam 1 Dr....

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