Fall 2010 Practice Exam _5 Key

Fall 2010 Practice Exam _5 Key - CHE 1301 - Fall 2009...

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Unformatted text preview: CHE 1301 - Fall 2009 Practice Exam #5 G m "V, (,Hufu.) 1) In which ofthe following does the central atom use sp3d2 hybrid orbitals? A.NH3 ‘sJ_ H .; B. SF4 ’5’“, N > \ 5 / i: D C. PFs H0; / l \ / ‘l \ @Fé 5“ ‘ H H H (I? ‘ )1 E. both 8 and C use sp3d2 hybrid orbitals - \(ll /' \ V / \\\\ , ‘ , ‘( \ ,/C/ P , ,/ , II \(V (\\ \ / I \ / 2) Which of the following molecules has a dipole moment? 7 l(, I' — ‘ Qua; w‘A-IV ~ vv ' v ,r; B.CF4 ii, I H]; \K / a" on. 5» rl'td ' W» I ’ K—I u ‘ I ‘ L" PF5 7 ‘ x r C , '7 P \ ~ D. SFfi I l l y / ‘ ‘._ I E. both A and B have dipole moments ' J l V 1 14 “KM” origin; 3) How many of the following molecules have central atoms which are sp3 hybridized? / / o' / CF4 SlF4 SF4 XeF4 PF3 53:7, in; wit” 'blu, ML» I ‘ I ‘ 8.1 ,F‘ f \ , / {7 F C.2 l P 1 /-‘ fx \F t (— r Ll >\V\ / l / \ ® — \ X‘ / / \ ' i['\ \f I A”; \l’ ‘ 4) Which of the following species have atoms which use spz hybrids? _ - o'rlu‘w.) @303 We 3 WW" /B./st «c. 5 A {NH3 (‘1‘ F“) icil JXPCla (so. H3) ‘ E.bothAandB L b x \ “a / / C' / / J \ C‘ \ \l '3. l: CHE 1301 - Fall 2009 Practice Exam #5 5) For the reaction: , , 31¢. ‘41 L SlF4 + 2 F‘ —) SlFs'z The hybrid orbitals around Si change from A/sp2 to sp3d ‘_ Z l l l‘ \ / \ I l‘ B. sp3 to sp3d F 1 12§p3dtosp3d2 » ‘ _ \ \ ‘ / .ptosp3 H: ,3 7 [r\ “x, 4), p3tosp3dz ‘ l ’ l,‘ / l \ )T‘ .r l V/ r , \ l "5 '1 l)? 6] The molecule 2-butyne-1,4-diol, Hz(0H]C-CEC-C(0H)H2, has single bonds connecting H atoms to C atoms or O atoms, single bonds connecting O atoms to C atoms, single bonds connecting two pairs ofC atoms, and a triple bond between the middle two C atoms. Using localized bond orbital descriptions, the molecule has two sp-hybridized C atoms, two sp3-hybridized C atoms, two sp3- hybridized 0 atoms, and a total of A. 9 0 bonds and 4 1r bonds 10 0 bonds and 2 1! bonds @1 0 bonds and 2 1: bonds D. 11 0 bonds and 1 1r bond E. none of the above H H 5:—;l\L \00’é7 2 \ hfp‘t \wré IUU‘ \NVDA') n; by: z n 1”“, 7) Which of the following molecular geometries are some that are possible for molecules whose central atom uses sp2 hybrid orbitals? A. tetrahedral, trigonal planar, and linear K ’L 3 Hp“? t,L XMLLX B. trigonal pyramidal, trigonal planar, bent ’P rigonal planar and bent ‘ . D.T-shaped, pyramidal, and linear /\~‘/~, ’ L' "3"" P‘VV E.tri onal ramidal and bent r E PY A y I" 7 lat , 3r CHE 1301 - Fall 2009 Practice Exam #5 8) How many and what type of hybrid orbitals does the central atom of SeF4 use? /11Y.6,sp3dz 3”” . ,sp3d / \ / .4, sp3 f / F: ,9.’S,sp3d2 \ \ 6 “n k 5 r\}.\v\4\‘ ML; A 1 5 K6,Sp3d3 \ \ 0 .1 t— ? r / / \ f "/ 9) Using molecular orbital theory and the energy level diagram atflthehack of the exam, determine the bond orders for the species N2‘ and N2, respectively. " A. 2 for N2' and 3 for N2 B. 3/2 for N2‘ and 2 for N2 u C. 1 for N2‘ and 3/2 for N2 //4 D. 5/2 for N2‘ and 3 for N2 /" E. 5/2 for N2‘ and 2 for N2 10) Which one of the following species if the most stable?l(MO theory should be helpful) A. Hz- 3. H2 ’ C. Hez' D. Hz‘ E. H92 1 1) The Lewis formula for the nitrate ion, N03; indicates that the formal charge on the N atom is @1 7M! B.+2 C. +5 v ' x \ W D.-1 / ©\\ / C9 E. none ofthe above \ (\J l OI fiVCL’u a‘ — a 0" LU’3‘; ' a 0“ \oh'v Vnir Q - CHE 1301 - Fall 2009 Practice Exam #5 12) Which of the following molecular has a central atom which cannot expand its valence beyond an octet of electrons? A' [crr\a\' \"¢\rL l”er YH' ‘OC ‘ B. CH4 ‘ D SlF4 — LAN) \erL n oft h‘vr ‘61 A and 8 cannot expand their valences beyond an octet E. all of the above 1 O — N i 0/ Mp: ‘ ‘W P °' 13) Which ofthe followingspecies is notplanar? ' \ > ’ \ l ‘) A_c03-z 1W: (‘3) ‘ f B.N03- W C to a “ H > C'Noz. KL: / / \Q/ /Q/ \U; V H (i @5012 74,; ‘.<)/ x l \ \ \fi\ — E.non fth abo e , ~ \ A11: lr‘ rt, ‘ ~ M i: r *Mw‘ "Mr P ' i 5' \ 3 HUM-"3A ' F , . . / \ \ P / . C; \O/ (. NOT 54mmxr:w\ > ' [f \ \ / 14)‘How many of the following species have dipole_moments? > P \ 2' 119 Hot“ HoJ 21¢, it /F / J , CIFs SFs‘ PFs Xer PHa' ‘ / (A ‘ x ‘g X X X x 57W” r-u i5 , x , i ’ \ —. ‘ c.2 ‘F\-' F/ J‘\ /Y/ ‘i’ D.3 / U ’ 5 x, ‘ i E4 59 -/ \ f" w / J7 i x ‘ / ‘ \,I \ / \ / L / ‘ l l l‘ i A a Mir-L4 no bymm "w “W 7 ‘. F s \w \ON. 9n" ’ 15) Which is mostionic? [xyzfi ,5 : lirwr " 6%wa (“Am’u— t" C\LK\'L){\" [‘ x "’3‘7) . A. ClF 5Yr~mmr¢£cle B. HCI D :21: E. F2 \: CHE 1301 — Fall 2009 Practice Exam #5 16) The structure below represents the Lewis electron-dot symbol for an element in either period 2 or period 3 of the periodic table. Which element is represented? Per-qé 1 law 0 O C: Vc‘v‘u Angkor”) ) ‘20 0’ A) O O O 0 AP B.C C.Al 115 FE} 17) Which ofthe following species has some number of bond angles exactly 180'? E. none of the above XPFs > Ibt- AX}: : *f‘fiuru‘ 97ft“ - ’ . V L @Fez‘w “ 4‘ '; C.BF4- P \ 7 4 \ / "’ /» / l \— / — 5 x »‘ 0.5m ‘\/ \ _ F / I r, ‘7 18) Predict the most polar bond. (mm AM.” l . chad l‘u l(,' N} 7) A. C-C B. 3—0 C. C=C D. N-O -F CHE 1301 — Fall 2009 Practice Exam #5 19) Predict the longest bond length @3-0 (\an\3\., \m—ébz Sku'h' hr" ‘1"»-,\o M=C za/C=O \n’v‘l’ 0‘0"“) " ‘Umvr \("\h" JC=N E.N-0 20] Which compound does not contain a covalent bond? A. NH4CI B. NH4N03 C. HCI c1 E. all of the above PM; 21) The molecular geometry of the molecule SOF4 is closes to being A. square planar l b‘ 1»; B. T-shaped \ / ’ @rigonal bipyramidal , 6 AX 5 i D. square pyramidal \ F \ 1 ‘ / l E. tetrahedral 22] Given the following reaction, calculate the bond dissociation energy of the O-F bond (Do-F] in OFz. Do." = 464 k]/m01;Do=o = 498 kl/mol; D” = 569 kl/mol '2 7 0+ L114va MW 1mm 0F2(g) + H20(g) —) 0:0”) + 2 HHS) AH" = .318 k] Q95 kl/mol r ( N ( B.-195k]/mol an”? 2 mtrmkh » A no: NW}? C. 390 kl/mol D.-390k]/mol _,5W LS 1 DOV? r- 2, fig“) . ‘ , «um-1 t 2), E. none of the above D D D CHE 1301 - Fall 2009 Practice Exam #5 23) Estimate the heat of reaction for the hydrogenation reaction below. Dc." = 414 kl/mol; Dc=c = 611 kl/mol; D...“ = 436 kl/mol; Doc = 347 kl/mol 1 c L r 1 (—1» wk Lyme H H I I H3C --- C == --- H (g) + H2“) _) HJC --- C -—- C --- H II II HH HH UL 1,..1 Wm 'w k 3 W A. 564 k] OHH'V “DE MAW“: - 2 hm: {:"zxwel'n B. —564 k] c. 128 k] 128k] E. none of the above bur‘r‘.’ (L\\1(3 I, by?!“ ) v <3‘17r [IVVVH \1\ > all,“ ma? w — new»; Ln,” ' «1‘1 \u)’ 24) What is the molecular shape of 503? ‘ I 1 A. pyramidal In L O .1 ‘ B. tetrahedral C. octahedral @rigonal planar / // \ O / E. none of the above O \ ' 7 \ 25) Wthl‘l cannot have resonance structures. / O Mow AU» at \nu' (“I A. C03'2 w c ' 1' 4~ B.N03' [phi ~ \ C.0,ozone 1‘6 / * \ 3 (.1 _ @Nw {o \ i E. none of the above \ Raga-v“ ‘,\xn\LH r( S CHE 1301 - Fall 2009 Practice Exam #5 26) The figure below represents which molecule or ion? Any orbital on the central atom containing a non-bonding electron pair is shown, but the ionic Charge on the molecule, ifany, is not shown. vmfio‘até “'D'OL/ O Q luf‘l I _ » l Am, x» \ /A./XeF4 (5m r33) j Phil L L B. ic14~ we IV-q‘i / ‘/ r I t l; KSil'h 3L7 ' [kiwi ' _( / / ’ DiSFa (an H0“ NM @he structure is representative of both B and D A y” y; 5 “war. 9 .* \tbll' LA 27) in which of the following does the central atom use sp3d hybrid orbitals? A.NH3 (St. El) 7 9p, B.SF4 ks” i—M) v sp‘é 1’ C.PF5 (eat H1)" 99’; ('ggi H7 )’ ')(1(l l (Bi/both B and C use sp3d hybrid orbitals 28) Which ofthe following molecules has a dipole moment? A/BFs my wl ~V POL/“2 / ‘ \ /BTCF4 u i \ / fl) C(PFS ['7‘]qu , [ff/wv‘vufll “ i \ 1: l ) 35E: (Sit ill» ‘ MOT «)r/mnh‘h‘ul ‘ - v r E. bothCand Dhave dipole moments \' w l' ‘ C - \ ' / I \ i I Am \T‘ CHE 1301 - Fall 2009 Practice Exam #5 5 Half) (Ala-NA 29) How many of the following species have central atoms which are s 3d hybridized? (Mam) (was) (w w) (seal-W) (w m on /SiF4 sm m4 993 \/ 6/1 B. 2 C. 3 D. 4 E. S 30) Which of the following molecular geometries are some that are possible for molecules whose central atoms use sp3 hybrid orbitals? A. tetrahedral, trigonal planar. and linear "5 B. trigonal pyramidal, trigonal planar, and bent 5? C. trigonal planar and bent [/1 tkbnl‘ (flurxk) I D. T-shaped, trigonal bipyramidal, and linear /'\ 7’L4 lei mirw‘w‘ igonal pyramidal, tetrahedral, and bent ’ \ l /L>( a) ’ #fvw'L‘ pyrr-fl -(‘r ' . ' , l A Y L l: \1! 31) Predict the most polar bond. (“rockg— JILL!“ 'UK ir- €.)(( LIL?" (L lo“? 7) CHE 1301 - Fall 2009 Practice Exam #5 32] For the reaction below, estimate the heat of reaction (AHM) given the following average bond energies: 00.5: = 195 kl/mol; Do.“ = 464 kl/mol; Do=o = 498 kl/mol; Din: = 569 kl/mol OFzm + H20“) —) 0:0[g) + 2 HHS) Aern = ? ’ "A \w' '. —l 18 L 0 r P; J U ‘74 r B. +408 k] 1 0'“ V97 1 Hw- ml) C.-816k] “+318” \ A : 2 ram .4 , g m r a E.-408k] 0L '7 (m L > a. r) » AH ,, LL mm . 2, mm =15). (W M » 1! 1mm ) .. r,“ all 1 mg \LJ — Hm, \LS 1% w5 q“ / r _ . . . . _ _ | 33) Which of the followmg specnes 15 not planar? \O OF @103' U-v‘ [on (o\ Ay L L.-)r (VLF) ME» ‘ \ ,_ / ll 1- C NOz In C i M D.SOz We- ‘ /C‘ / \ O E.noneoftheabove . U, x / \ I > I ’0 —’ 5 » 0' AXDL; “Hard AY5~ }r‘v‘om‘ \ _ - re; v\ \("C r P‘Irc A P AXLE km}? 34) Which of the following species have atoms which use spz orbitals? A. BCI3 (an 3‘4) — seq’ 3 Hm)» Omaha B. 503 (ML ‘31—“) ’ 5f“, CSOZ (an. H33) HIP") D.both A and B @u ofthe above CHE 1301 - Fall 2009 Practice Exam #5 35) For the reaction: _ , 5‘49, '41:, SeF4 + F‘ -) Ser' The hybrid orbitals around Se change from AKSp3 to sp3d / , \ /‘:‘ ’F \ /B’.sp3 to sp3d2 j \ / l‘ / ‘ ~ \ / / /C/.sp tosp3 ° MI , / )o\ / \ \ _ t‘ ’ \ p3d to sp3dz / r F/ ' = D / 3’ ’ E. the orbitals do not change \ / \ ‘ f y ’5 'L 5? A 5‘93 36) The molecule 1,3-butadiene, H2C=CH—CH=CH2, has single bonds connecting H atoms to C atoms, a single bond connecting two C atoms, and double bonds between two pairs ofC atoms. Using valence bond descriptions, the molecule has for sp2 hybridized C atoms and a total of A. 9 0 bonds and 0 1! bonds CM ,7 7 T \0 A B. 11 0 bonds and 2 1! bonds 7 “Wk \o‘r ’ _ S C. 10 0 bonds and 2 1! bonds H H ‘4 H 7/ AMBM \‘Ou—A‘a ‘ 5 0' r obonds and 21tbonds ‘ l i ‘ KY‘ ‘ka> E. none of the above C T L ' C i (— ( symmlrkd \.) 37) How many of the following species are non-polar? (5“, HS) (41!: (alcfil) (Su‘fi’b) “Wt, $iF4 SFs' PFs XeF4 PFa' ‘/ )( \v )/ / A.0 ’, ‘ B. 1 ’.- l l ’. CC) \‘\ \/ k/ 0.5 P ~ l E.4 ,_ / \_‘:/ / \ I‘ \" \ \F \‘/ / If \H / 5V /’ / l” x» l ‘ \/ ll" C P) (1) C CHE 1301 - Fall 2009 Practice Exam #5 38) Which of the following species has some bond angles that are exactly 120’? ,At/PFa (55" Hr!) / \ /B.’SF5 (an W7) no" @03 We; 5 3 D. BF: / / \ of E. none of the above \0/ ‘ nor/Qt? a“ o“ ‘74)“ 39] Which cannot have resonance forms? A. (203'2 (tilt B 1‘?) I I "a . / N \ C. 03, ozone (“‘4 the) H H' H D. N03' (m W5) E. B and C cannot have resonance forms I l {‘0 Ao\.‘\3\c m-A‘) ’ (‘0 rogopnr‘u ('(V‘LJ 40) What is the total number of moles in a mixture of N2 and 02 gas in a 44.8 L container at 273 K and 0.500 arm of pressure? A,o_50 a 175% cm) \clm‘ \Na‘ 17’ "‘ L c. 2.0 Low PUT;er - Av» ht Val-w, so 17,-” L - 1 “N «‘f ? D. 2.5 E. none of the above = w M 41) Calculate the density of trichlorosilane, SiHCls, at 85'C and a pressure of554 torr. ,Lh A. 5.77 g/L '7” @227; A— D.4.60g/L W: “A”; E. none ofthe above ‘ > (.714 m) \/-. (“/wm 7m) (“1mm M A: r/v= gait/NA CHE 1301 - Fall 2009 Practice Exam #5 42) CM; reacts with 02 according to the following equation: 2C4H5+ 11 02—) 8C02+6H20 Measured at standard temperature and pressure (STP). how many liters of C02 are formed for every 0.50 moles of C4He that is combusted? A.4.50 ‘ 4'8 f 0-7 rde > (-17 M L) -. hvv-‘t L b 3.2:: m! '”" 5.1.00 '1, 1H: 43) The density ofa sample of pure unknown gas was measured at 1.50 atm and 27“C and found to be 7.68 g/L. Which of the following is the gas most likely to be? A.C02 < m ‘/~\ PW (“"1" ‘ 3.02 » W“*“‘ P\/». ("A/0‘” D CF4 ' «¥"/"’\ MP (EFF; a \1L”‘/~‘ 4' “KW. /7/Y E. not enough information is given to solve the problem _ m ( 1 ,‘7 A») K 71’“ O/L (9’; l. ‘ )(500 V) rm mu %\ 44) What volume is occupied by the gases at 1.00 atm of pressure and 273 K at the end of the following reaction in which 44.0 g of PF: is mixed with 32.0 g of Oz? 2PF3(3)+02(g)—)2PF30(3) by") OR): 0") F" 9V3 A.11.2L “‘9'” "A “71% 01' “M 01 , B.25.3L ’f \: 022.41. “2" D.44.8L 8.0L ( O'DFXQV3)L1r/PHO 1M1, > 2 “1 L (mm tho \ 1.»)X9F/g 1")” 0715 ~\ at 0L 6 Limit Amth (075co‘)(11-‘4Lm,\) u.qu lbfgLrHlL’ CHE 1301 - Fall 2009 r MN'ILA Practice Exam #5 45) Calculate the mass ofSFe in a 4.00 L container at a pressure of2.00 atm and a temperature of 351 K. - (>\/- M? ‘ A. 20.3 g ~ re \rLl c906. pM/M 3 ) M) ’“ 0% ll 3‘21 — 0) “17g (1el»)(blLl‘(/4L'3'L‘ ( D. 183 g E.526g m‘ “WM 46) The percent by volume of Oz in air is 20.946%. What is the partial pressure of 02 ifair has a pressure of 748 torr? A. 0.984 atm to w =L °/u UL P 0" o I B.0.768atm v ,‘ ‘ 1 " 7.4., M, l) c. 0.180 atm ‘0‘) A "“ .2063tm P r VDLI‘Ii/L L.” 1“: (,LN E. none of the above a 1' 47) lf0.10 mol oflz vapor can effuse from an opening in a heated vessel in 52 5, how long will it take 0.10 mol of Hz to effuse under the same conditions? A. 0.41 S 80 5 My 7 ‘7 ‘/ C .6 s - N1 1’ I D. 2.6 S E. 13 5 “3.9741 1 $77 " a! Y 1 Vll’ '> C CHE 1301 - Fall 2009 Practice Exam #5 48) Chlorine dioxide, ClOz, reacts with fluorine to give a new gas that contains Cl, 0, and F. In an experiment you find that 0.150 g of the new gas has a pressure of 17.2 mmHg in an 1850 mL flask at 21°C. What is the identity ofthe unknown gas? ._ £13 ,‘.,. “((5 L : 7/qu [L A.Cl20F -, lu'ufl’V-«l 3.00ze : Io‘m‘: Val W: (AZ-T coon - wva 9v- (7m) RT @cnozr r u .v. W/m‘ E. none of the above (.01 ‘leIX ms L): ( "wfi’ ‘W 371*“) K 1"” M) M' «film/r0] 49) Which of the following species has the shortest bond length? *r?\. \WO')‘7 " \ A. c-c 9L0)». 5» W.) 5 B. C-N ®cEc D. C=C E. not enough information is given to solve the problem 50) A mechanical application calls for nitrogen gas with a density of 1.05 g/L at 298 K. What must the nitrogen gas pressure be? M 1 g ,U‘ ,\/N \ A. atm P fl. VLF 1.27 atm ~ ~ @BZOatm W‘ (7”) W D. 1.09 atm A M/v» FAQ/WI" l/‘f\ll P LOW/1,? [u / V)¥Ll)£rlq‘é M) P: IC\|7 glm E. none ofthe above ...
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This note was uploaded on 12/08/2010 for the course BIOLOGY 1306 taught by Professor Lind during the Spring '10 term at Methodist.

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Fall 2010 Practice Exam _5 Key - CHE 1301 - Fall 2009...

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