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Spr07 - L Chemistry 1201 Thursday Group Final Exam I On...

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Unformatted text preview: L! Chemistry 1201 Thursday May 10, 2007 Group Final Exam I On SIDE TWO of the answer sheet (Scantron); l) Print your LAST NAME then FIRST NAME and bubble it in. 2) Print and bubble in your SSN number. On SIDE ONE (Scantron): Answers to the test questions should go on side one. There is exactly one best answer for each question and you should NOT leave a question blank. On a numerical question, choose the response closest to the correct answer. Data: Avogadro's constant: NA : 6.0221 x 1023 atoms, molecules, ions, etc. per mole Speed of light: c r: 3.00 x 108 m/s Planck's constant: h = 6.626 x 10"“ Is Idea} gas constant: R = 0.082057 L arm/mo! K = 8.314 J/mol K 1 atmosphere : 760 torr = 760 mm Hg = 101,325 Pa mo 2 :00) + 273 Somme rem Compounds a Important Exceptions Compounds containing Nflgw None C2H302 N01315: Ci” Compomtcts of Ag*, Hgffi and. Fez"? Br” Compounds of Ag‘fi ifigf‘i", and I’bg'l" t" Compounds of A34} ngzfi amt 1633*“. 8042’ Compounds of 8:26, Be“) Hgf‘”, and. P1320“ Insoluble Ionic Composites Important Exceptions Compounds containing 32"” Compouncis of N105“, the alkali metal carious,» and (Sew, Stag”; and Be“ {3032“ Compoumis of N363"? and the alkali meta} cations P043“ Compounds of Nflf am} the alkali metai eatioos 0H“ Composites of the alkali metal cations, mafia“, Srfl‘, and Baal” H H NNSGHH musbfifi Nmfifix Hm Hm. Mkmmmuflma «3856 Swami . a? H mm «human hhfivmhfi H awaken» H m «33.3 flawed 5 Z. Hm Hm H . m H Nwfififimwfi .36ka Hummmx. mu. m l mu HQ 5 ”3H. mm; “Arum m m m m m u w m Ha Hw HM Hm .H Hm. HHH m OH llllllllllllllll .Hw wa. me Nmm mmmm mm. mm...» wmbw .wmkwm “Emma- . .. . mm mm m.» w.» mm mm mm mm mm mm mm mm . . . . .. .. HN . . . ME .36 ..mn ma. MW mw. Wm Hu . . . . .. . . . mmb» HmH. wmmw Haw. mH Hmmybw Hmwm mu HHMfl HHM. HmN. ...?wa ...H HNH. wwm .HNN. mm HNm mm. HmZ... Na .. .2 um . . . mm , . . E mm mm HH. m4. mm . gm. 3. Hm“. .mmw Hum. .wH Hum am .Hmw. mm HmmeA Hmmhw Hmm.mw HNNNN Hmmbm . Mme. mm .. . Hmm Ham. Ham Ham. HS HHN mm my mm 3% HHQ HHH H N Nmm Nma Nmm Nmm Nmm. .mH .mH mm. mm”, m5 mm— mm mm. En. Ham. HmH EMMA Hmm. mm HmHm wm Hmw. mNm. Hmmm mm HmNm m: Hmkbm mm NBA; .mwmbm Mm“. me mmw a 91 Embfi hEHbfifi NEH wflhfiflm bk. Nam 56%.“ hnwbhm. kmfiuhfim. NH NM mm HH HMNm firm» #63333“ mm . HH... .Nmm.ma Your calculator displays the following number: 7024452141. When expressed to FiflE significant digits ,an_d in scientific notation, it becomes . a. 7.0244 x 102 b. 70.245 x 10‘ c. 702.23 x 106 d. 7.0245 x 102 e. 0.70244 x 10-3 Choose the answer which gives the correct number of protons, neutrons, and electrons in one atom or ion of the designated isotope. One 207Pi)2+ ion contains 207 protons, 82 neutrons, and «“2 electrons. One ”We” ion contains 72 protons, 124 neutrons, and 74 electrons. One 561%3+ ion contains 26 protons, 30 neutrons, and 23 electrons. One 15N atom contains 15 protons, l4 neutrons, and 15 electrons. rho-953‘s One 1301 atom contains 53 protons, I30 neutrons, and 53 electrons. Choose the answer which gives the correct chemical symbol AISD classification (metal, metalloid, or nonmetal) for the element named. a The element called strontium is a metailoid with the chemical symbol Sr. b The element called telluriur'n is a metalioid with the chemical symbol Ti. c. The element called hydrogen is a metailoid with the chemical symbol He. d The element called aluminum is a metal with the chemical symbol Al. e The element called helium is a metalloid with the chemical symbol Hg. Choose the anSWer which gives the correct name of the compound whose formula is given. a. The correct name of LiNO3 is lithium nitrate. b The correct name of Fe2(CO3)3 is diiron tricarbonate. c The correct name of Sr(CN)2 is strontiumfli) cyanide. d. The correct name of KCiO is potassium chlorite. e The correct name of i\/I,g,r(CiCl3)2 is magnesiumfli) chlorate. Choose the answer which CORRECTLY categorizes a compound as ionic or molecular based on its chemical formula. PFS is ionic. BaBr2 is molecular. a b c_ NF3 is molecular. d CSHm is ionic. e NaI is molecular. When the reaction below is correctly balanced, the coefficients for x and y are: W x .... Fe(N03)3(aq) + __ NaZS(aq) ——+ __ FeZS3(s) + J_NaNO3([) a. x=1andy=3 b. x=2andy=3 c. x=3andym6 d. x=2andym6 e. xm3andym3 Calculate the number of grams in 0.500 moi of Fe(HC03)2. a. 356 g b. 58.4 g c-. 88.9 g d. 75.6 g e. 234 g Which of the following describes a combination reaction? H2C03(aq) *3 H200) + (1026;) Fe(s) + (311804 (aq) ~—> (311(5) + FeSO4(aq) 2 C2H6(g) + 7 02(g) we 4C02(g) + 6H20(g) Mg(s) + 2 OH (aq) “9 Mg(OH)2(s) 4 C3H5N 09(3) —9 6 N2(g) + 12 002(g) + 10 H 0(g) + 026;) 59.94.0172» The empirical formula of a compound containing 40.1% C, 6.6% H and 53.3% 0 by mass is __ a CHO b. CZHZO c. (3211402 (5 CHZO e (311402 How many grams of C12, are produced by the reaction of 74.82 grams of MnO2 with 48.20 g of HCI? Also, identify the LIMITIEfi REAQENT. Mn02(s) + 4 HCl(aq) m) MnClfiaq) + 2 H200!) + Clz(g) 23.44 g, limiting reagent is HCI 53.75 g, limiting reagent is MnO2 93.79 g, limiting reagent is HCI 61.06 g, iimiting reagent is MnO2 61.06 g, limiting reagent is HCi 9999‘s» 11. 12. 13. 14. What is the net ionic equation for the following “molecular” reaction: NH4NO3(aq) + NaOH(aq) ~—+NaNO;,(aq) + NH3(g) + H200) NH4NO3(aq) + NaOH(aq) —-—> NaNO3(aq) + NH3(g) + H200) Na“(aq) + NO; (aq) -> NaN03(aq) NHMaQ) + OH’ (aq) -> NHM) + H200) NH4N03(aq) + OH‘ (aq) —> Nos‘taq) + NH3(g) + H200) Nonsense, there is no reaction — all ions cancel out! 9999‘s» How many grams of solute are present in 50.0 mL of 0.360M KZCI'ZO7? a 0.0180 g b. 5.30 g c. 6.12 x 30'5 g d 40.9 g e 2.12 x 103 g Acids and bases undergo a neutralization reaction in which a salt and water are formed. What is the molar concentration (molarity) of the hydrochloric acid solution, if 36.0 mL of it requires 18.9 mL of 0.213M of the calcium hydroxide solution to get neutralized: Ca(OH)z(aq) + 2 HCKaq) 9 CaC12(aq) + 2 H200) a. 0.224114 b. 0.112114 0. 0.447M d. 8.63 X 10"5M e. 5.59M Which of the following qualify as strong electrolytes? (1) Milan) (ii) NaOH(aq) (iii) H2C03(aq) (1V) Nil-Mail) (V) (NH4)2SO4(aQ) (vi) CaCO3(s) (vii) Fe(s) and (ii) only and (iv) only (vi) and (vii) only (iii), (iv), (vi) and (vii) only (i), (ii) and (v) only 9999'?“ 15. i6. 17. 18. 19. What is the moiarity of 2.00 L of a dilute solution prepared from 125 mL of 12.1M HCi(aq)? a. 0.194114 b. 0.756M c. 3.02M d. 5.17 x 10”2M e. 2.58 X 10"2M What is the frequency of radiation whose wavelength is 359 nm? 8.35 x 105 cycles/sec 8.35 x 1015 cycles/sec 5.54 x 10‘19 cycles/sec 8.35 x 1014 cycles/sec 1.85 x 10”27 cycles/sec EDP-‘9???” Select the choice which gives a CORRECT set of vaIues for n, l, and m l for an orbital in the subsheil given. a. An orbital in the 5p subsheil can have the values n z 5, l: i, and ml : +2 b. An orbitai in the 4d subshell can have the values in: 2 4, l 2 4, and ml m 0 c. An orbital in the 6f subshell can have the values nm 6, l m 3, and ml : 0 d. An orbital in the 5f subshell can have the values it : 5, l: 3, and m l = —4 e. An orbital in the 7fsubshell can have the vaines n = 7, l 2 4, and m l 2 +5 Which of the following LS a permissible (allowed) set of quantum numbers for an electron in a hydrogen atom? The atom may be in an excited state (ie. n. may be larger than 1). a n:5,l=4,ml=+3,andms=0. b. n=6,l:5,ml=+3,andmsm+i. c. nm3, lm3,ml=+2, and msr-t-l/Z. ti. 11:4, l:—3,ml=»1,and mS=—1/2. e. raw-4,1:1,ml=+1,andmsm-U2. Which of the following is the CORRECT condensed electron configuration for the atom or ion indicated? The electron configuration of Ba2+ is [Rn] The electron configuration of Ga is [Ar] 452 lid“) 4p1 The electron configuration of (302+ is [Ar] 4s2 3ats The electron configuration of In3+ is [Kr] 552 4d3 The electron configuration of As is [Ar] 452 3d10 3p3 EDP-“PST?“ 20. 21. 22. 23. Shown below are three valence—shell electron diagrams showing electron configurations and spin directions represented by arrows. Figure out which of these three diagrams (top, middle or bottom) is correct for the EALENQE shell (only) of vanadium (V), and count the number of unpaired electrons in the correct diagram. Choose the CORRECT statement from the multiple sI dIIClDEl HIDE! sI dIIIClEl pEllIlE] SfillrdIIIElEl NUDE] V has the valence shell depicted in the top diagram with l unpaired electron. V has'the valence shell‘depicted in the bottom diagram with S unpaired electrons. V has the valence shell depicted in the middle diagram with 5 unpaired electrons. V has the valence shell depicted in the bottom diagram with 3 unpaired electrons. 9999‘!” V has the valence shell depicted in the middle diagram with 3 unpaired electrons. Which of the following sets of elements Br, Ar, Ca, Fe is correctly arranged in order of INCREASING atomic radius (smallest atoms listed first)? a. Ca < Fe < Br < Ar b. Ca < Fe < Ar < Br c. Ar < Br < Fe < Ca d. Ar < Ca < Br < Fe e. Br < Ar < Fe < Ca Based on the trends of the periodic table, arrange the following ions/atoms in order of INCREASiNg; size (smallest ion listed first): Ne, Xe, Tea", 02‘ a. Ne < Xe < O2~ < Te2w b. 02' < Ne < Tez‘ < Xe c. - Tez‘ < Xe < 02‘ < Ne d. Ne < 02' < Xe < Tez" e. Xe < Ne < Tez' < 02‘ Based on the trends of the periodic table, arrange the following ions/atoms in order of INCREASING first ionization Energy: Cu, Ca, S, Ne, K a. Ne < S < Cu < Ca < K h. K < Ca < Cu < S < Ne c. K < Ca < Cu < Ne < S d. S < Ca < Ne < K < Cu e. Ca < K < S < Cl} < Ne 24. 25. 26. 27. Which of the following chlorides should have the greatest lattice energy? a. KC! b. RhCl c. N aC] d. LiCl e. CsCi Using the table of average bond energies below, what is the AH for the reaction: H l Ca0 + 2 (H—H) *9 H~—C — Owl—I H Bond CEO Hw‘H C—O C-H OmH Dad/mob 1072 ' 436 358 413 463 a. +276 k} b. -276 RI 0. “I 16 1d d. ”735 k] c. +735 k5 Choose the answer which describes electron-domain, molecular geometry and the number of nonbonding PAIRS of electrons in the valence shell of the CENTRAL atom for the BrF5 molecule. Electron Domain Molecular Nonbonding Pairs a octahedral octahedral 0 b octahedral square pyramid 1 c. octahedral square planar 2 d trigonal bipyramidal see saw I e trigonal bipyramidal trigonal bipyramidal 0 What is the formal charge on the nitrogen atom in the NH;r cation? a. 0 b ~—1 0. +1 (1. 4% e —2 28. 29. 30. Consider the following 5 (five) species and answer questions 28-31 Which of the above species has the largest number of lone pairs of electrons on the central atom? a. SiCl4 b. PC13 c. 86:02 d. Xer e. XeO2 Choose the answer which QORRECTLY characterizes the first THREE of the above substances as polar or nonpolar: SiCL1 is nonpolar and PCl3 is polar and SeO2 is polar SiCi4 is nonpolar and P03 is poiar and SeO2 is nonpolar SiCI4 is polar and PCI3 is polar and SeO2 is nonpolar SiCl4 is nonpoiar and F'Ci3 is nonpolar and SeO2 is polar PP—PP‘P’ SiCl4 is honpolar and PC}3 is noupolar and SeO2 is nonpolar Choose the answer which CORRECTLY identifies the sets of hybrid orbitals used by the central atoms to form bonds in molecules of Self)2 AND in molecules of XeOz. a. SeO2 uses 5,03 hybridization and XeO2 uses sp3d hybridization. b. SeO2 uses sp2 hybridization and XeO2 uses sp hybridization. c. SeO2 uses sp2 hybridization and XeO2 uses s‘if'a’2 hybridization. d. SeO2 uses sp hybridization and XeO2 uses sp hybridization. e. .‘EieO2 uses 5p2 hybridization and XeO2 uses sp3 hybridization. For which of the above species a correct Lewis structure QANNOT be drawn without the expansion of the octet on the central atom? a. SiCl4 b. SeO2 c XeO2 d. PC}3 e. XCF2 32. 33. 34. 35. Choose the answer which MOSI‘ ACQXJRATELY describes the value of the selected angie in a molecuie whose Lewis structure is shown below. The angle is approximately 360° The angle is approximately 180° a b c. The angle is approximately 109.5?" d The angle is approximately 120° e The angle is approximately 90° Determine the temperature (in °C) for a 0.80 mole gas sample contained in a sealed 5.0 L tank at a pressure of 3.0 x 103 torr. a. 28°C b. 300°C 0. 370°C 6. 20°C e. 60°C A sample of gas is confined to a cylinder houserl with a movable piston. The gas occupies a voiume of 10.2 L at 5.00 atm and 25°C. Calculate theegressure of the gas sample if the volume is reduced to 3.40 L at constant temperature. a. 1.67 atm b. 5.00 atm c. 15.0 atm d. 7.50 atm e. 6.94 atm Humans consume glucose, (35111206, to produce energy. The products of glucose consumption are CO2 and H20. C6H1205(S) + 6 02 (g) ....,, 6 C02 (g) + 6 H20 (g) What volume of CO2 in iiters is produced under the body conditions (37°C, 1.00 atm) during the consumption of 4.65 g of glucose? (MMl of glucose is 180.1 g/mol) a. 0.109 L b. 0.471 L c. 0.657 L d. 1.379 L c. 3.942 L 36. A sample of a gas mixture with a totai pressure of 6.5 aim contains 0.5 moles of Hz, 0.8 moles of CH4, and 1.6 moles of C02. What is the partial pressure of CH4 in the sample? a. 6.5 atm b. 3.6 atrn c. 1.1 mm d. 1.8 atrn e. 1.0 atrn 37. Place the following gases in order of increasing rms velocity, u, at 20° C, starting with the slowest first: Xe, C02, 02, N2 a. N2<02 <C02<Xe b. Xe<C02<02<N2 c. Xe<C02<N2<O2 d C02<02<N2<Xe e 02<N2<Xe <CO2 38. Consider the following diagram and determine which intermolecular force! interaction is responsibie for the boiling point of H28 being higher than that of SiI-i4? a. London Dispersion Forces b. Dipole—dipole interactions c. Hydrogen bonding :6 d. Covalent bonding 7% e. ton—ion interactions (electrostatic forces) Er. -s-m~.. i 85‘" ion Misti Molecular- mass mm-i.....,.~1......r........ 39. Which of the following statements best describes phenomena taking place between points I and 5. a. At constant temperature, ice melts into liquid and liquid turns into vapor. b. At constant pressure. vapor deposits into ice. c. At constant pressure, ice subiimates into vapor. d. At constant pressure, ice melts into liquid and liquid turns into vapor. e. - At constant temperature, vapor deposits into ice and ice melts into liquid. 00‘: Temperature 40. Choose the sclootion which arranges the substances with the formulas CH3(CH2)6COOH, HOOC(CHZ)6COOH, and CH3(CH2)6CH3 in order of INCREASEQ solubility in WATER (Ieast soluble compound listed first). 99»??? HOOC(CH2)6COOH < cagmgécoon < CH3(CH2)6CH3 CH3(CH2)6CH3 < CH3(CHZ)5COOH < HOOC(CH2)6COOH CH3(CH2)5COOH < HOOC(CH2)6COOH < CH3(CH2)6CH3 CH3(CH2)6CH3 < HOOC(CH2)6COOH < CH3(CH2)6COOH cmcugécoopl < CH3(CH2)6CH3 < H00C(CH2)6000H In nu- ...
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