C9HW2P ALL - CQHW2 Started Nevember 14, 2010 9:27 PM...

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Unformatted text preview: CQHW2 Started Nevember 14, 2010 9:27 PM Submltted: Navember 14, 2010 9:53 PM Tlrrle Spent: 00:31:07 Total score: 11/11 : 91.6667% Total score adjusted by u 0 Maximum possible score: 12 Done Whlch of the followmg statements is correct when describing the interactions that occur between individual chlorine atoms as they approach each other and form Clz? Student Response Correct Answer P As two chlenne atems approach each ether, each atomic nucleus starts to attract the other‘s electron, whlch raises the potential energy at the system “J I"??? As attractluns increase, se du repulsrens between the nuclel and between electrons m At some internuclear distance, the maximum attraction is achieved in Eplte at the repulsione. and the system is at its highest energy The mutual attractmn er nuclei and electrcn pair n the twc chlnrlne atcms constitutes the lame tmnd. none of these Scare: 1/1 which at the fulluwlng bands is longest? stud ent Response Correct Answer pep Psi: P’Cl Peer H m FPO??? “J Score: 1/1 Band energies can be corntllrled with values fur other atnrrllc prnpertles to obtelrl AH values that cahhet be measured directly Use tend energy, ionization energy, and electreh affinity values tram your text to calculate the AH fur the Iurll: dissociation of Eli: CH9) 9 CNS) + CNS) student Response Correct Answer A 1848 Idlle Br 71848 ld/rnol 1150 Idlmul a Dr 71150 ld/rnol rlurle at these are wlthlrl 5% of the Current answer “J n Scere: 1/1 If the bond energles of X2 and C’X are 1790 la and 2949 k], respectively, use information in Table 91 to calculate an estimate of the heat of reaction of A-l- x2 :> C2H4X2 rn ld. (Dc rmt type the units) Correct Answer - 1433 Student Response 49.2 Answer: Scare: Oil Estimate the AHI, in k), for the ntIoWlng reaction frnrn the bond energies givenr H2(g) + 12(5) 9 2H1 (5) Bend energy (ld/rnul): Heh, 435; H71, 297:171, 151. Student Response Correct Answer +7 8 4 c 29 0 +2 90 .7 m W90??? “J Scare: 1/1 10. 11. 12. Use the perlndlc table only and arrange the elements ll’l thls set In order otmcreasmg EN. 5, 0. El student Response Correct Answer A. O < S < Si E. S < D < Sl C. s < Sl < o D. o < Sl < S E. none of these a Scare: 1/1 Whlch l5 an acceptable descrlptlcn or a nonpolar covalent bond? student Response Correct Answer A bone that occurs when the bundlng electrons are between two atoms wlth olttenng electrunegatlvltles and therefure one atom can attract the bonorng electrons more strongly. B. A band that uccurs when an electrun ls transferred frum une atum tu arluther. . A bone that occurs when the bundlng electrons are shared between atoms of the same electrurlegatlvlty. A band that occurs when all the atoms pool thelr valence electrons Into an evenly dlstrlbuted sea of electrons that flows between and amurld the lnrl cores and attracts them together. E. none of these Score: 1/1 Select the ccrrect fnrmula for a compound formed from calclum and chlnrlne. student Response Correct Answer CaCl Cach & Cazcl Cazcl2 nuns? Cacl3 Score: 1/1 choose the most oolar bond. Cl-F, Cl-O, Er-Cl, F-Br Student Response Correct Answer Clr F Clr o E rt Cl FcEr PUP”? Score: 111 The meltan polnts af metals are onlyl moderately high because Student Response Correct Answer A. metallic bondmg ls weak B. metals have Fewer banding electrons than nnncmetals c. metals also have relatively low balllng points D. the melting process does not break the metalllc bonds. 5 E. metals prefer to be bonded to noncmetals. Score: lfl Whlch of the tollowrng l5 the correct formula fur magnesrum rlltrlde? student Response Correct Answer A. MgNtl3 Er MglNC’a): c MgN D Mg2N3 “MW; e Score: lfl Quartz (le?) Is a solro wlth a meltlrlg oomt ot 1ssu°c. The bonorng ll’l quartz l5 best descnbed as student Response Correct Answer . lattlce energy. network attractlnns. lnrllc bundlrlg. covalent bondrng. metalllc bonomg. 1/1 TMBI SCOI‘E: 11/12 = 91.6667% 5 Tota‘ score adjusted by 0.0 Maxwmum possm‘e score: 12 Done 1. errenge the teuewrng accnrdmg to mcreaslng band strength: NN trwp‘e tmnd, N:N, N-N student Response Correct Answer A NN trwp‘e band, N:N, N-N at NN tnp‘e band, NsN, N=N c NsN, N=N, NN tnp‘e band a , NsN, NN tnp‘e band E NzN, NN trrwe band, NrN Scare: 1/1 2. uredret whreh at the quuwmg bonds would be the \ungest. student Response Correct Answer A H-H at C-H ct c-c & or c=c E EC Score: 1/1 a. whreh one of the Mummy processes re exothermre? student Response Correct Answer A- Ms)” K (g) 5- K(§)* K+ (g)+e’ 5- E‘? (I) 9 3’2 (9) 9- ErZ (g) * 2 Br (9) E. K+ (g) +Br (g) 4 KEr (5) a Score: 1/1 4. Usmg the gwen band energree (BE), celeuxete Ahnm for the reectrun: H-fiC-Hm) + 2Hx(g) :> XCHQCHZXLg) Do not mcmde unrte with your answer. Bone EE (kamnl) C-H 413 c-C :47 (H: 1139 ex 289 H’X 515 )(*X 151 Student Response Correct Answer Answer: 120 120 Score: 1/1 5. Eetnnete the Ah', rn kl. fur the fallnwmg reeetmn from the bond energies gwen. N2(g) + 3H2Cg) +2NH3(5) Band energy (Kl/mm): NM 15:; N:N. 415: N, 945; HrH, 435: NH, 389‘ student Response Correct Answer A. sea a 5. +505 c. +95: D. +4533 E. +50 Scare: 1/1 6. which of the quuwIng exements Is the meet exectrenegetwe? student Response Correct Answer c S A5 :1 M sr WPOS“? Scare: 1/1 ID. 11. 12. Whlch er the rulluwmg elements, when eumnlneu Wlm rluurlne, weulu preuuce the must pmar covalent Darla: A B c D E student Response Ru N B R}: Sr Correct Answer Score: 0/1 Match the substance wlth the phrase that correctly descrlbes lts lmnds al lnhlc bl nehpelar cevalent e pelar covalent BF3 (EhterJust the letter) Student Response Correct Answer 1‘ c Cnrltall'ls c (100%) Scare: How is 1/1 the partla‘ lurlic character Ufa dlatumlc mu‘ecu‘e re‘eted tn the AEN cf the banded etums? mpnw> Student Response The smaHer the AEN, the more \lkely the band will be lurllc The lDl’HC character cf the band is hut related tn the AEN cf the bonded stem: The greater the AEN, the more \lkeTy the bond wil‘ be \DmCl The greater the AEN, the more cuve‘eht the band. hurle at these Correct Answer Scare: Whlch 1/1 Statement l5 not a Current descrlptluh at mate‘s and rlurlrrleta‘s? fl mpnwb Student Response Meta‘s tend to galrl E‘ECUDI’YS lrl reactluhs wlth flDflmEtE‘S Meta‘s have a Cherecterlstlc \uster whlle nunmeta‘s have duH surfaces Metels typiceHy have hlgh meltlhg pelnts while nenrnetels generally have law rneltlng pslnts Meta‘s are good electrlce\ conductors while nonmeta‘s are poor e‘ectrlcaT conductars. EH the above are correct Correct Answer Score: 1/1 Based eh lattlce ehergles, whlch uf the tellewrng run": sellds wuuld be expected te have the hlghest meltlhg pulrlt? “J rnpnm): student nesponse KF KCI K] Rb F Rb] correct Answer Score: Whlch 1f1 at the tollewrng IS a covalent campeund? Student nesponse N320 Cad2 l C120 Cscl N203 Correcl Answer Scare: 111 < Ynur \ntatmrr: Assessmehts > Vrew AH Subnnssmns >ViewAttempt View Attempt 3 of 5 Trtle: (:9sz Started: Nnvember 14, 2010 11:41 PM Subrmtted: November 14, 2010 11:57 PM Trrne spent: 00:15:25 Total score: 12/12 : mum: Tcta‘ score adJusted by 0.0 Maxrmurn passwb‘e score: 12 Done 1. use the penedie table enry and arrange the members urthe set in areer er rnereaeing band strength :71, seer, secr student Response Correct Answer 91 < ScBr < ScCI a 91 < secl < seer E1 Srd < Sr1< Scar SrEr < End < 571 F‘POS“? none of these Scare: lfl when two atnrrls farm a cavalehfly-bcnded dratnmrc molecure. the metance between the nude at whreh the patentral energy Is at a rrnrnrnurn I5 caHed Student nesponse Correct Answer the bond energy: the band \engthr a the muleeurar drameterr the cuvalent radrus "'0an the cuvalent drameter. Score: 111 Whlch of the raHaWIng statements concernrng estrrnetlng AH from hand energres Is rncorrect? Student Respanse Correct Answer Band breekrng rs endothermic (nos). Bend makrng rs exuthermlc (neg): Eund energres must be murtrpheu by the number er each band and the number or mules er the specres m the baraneed equatan Band energree are average varuee W90??? The sum er the band energree er the reactants re subtracted from the sum or the band energree er the pmducts a Scare: 1/1 Eetrmate the Ah', m k], for the ananng reactmh fmrn the band energies grvehr Hzflg) +12%)» am (5) Band energy (kJ/rnal): HcH, 436: Hr], 297: H, 151. Student Response Correct Answer +7 8 84 7290 +2 9 u . -7 m “1.50.”? “J Score: 1/1 Nrtregen and hydrngeh cnrnbme to farm ammnnra In the Haber process Carcurate (m kl) the standard enthalpy change AH° for the reactmn wntten bernw, 115mg the band energree gwehr N1(9) + 3142(9) 4 2NH3(9) Bond: N_N HiH NiH Bond energy (kJ/rnol): 945 432 391 student Response Correct Answer A 7969 kl B: 7204 kJ c: 7105 RJ 12 Dr 204 k.) E: 595 k.) Score: 1/1 Erectmnegatwrty re a measure of 10. 11. 12. WPOE“? student Response Correct Answer the energy needed te rerncve an electrcn trcrn an atcrn. the energy released when an electrcn ls added tc an atern. the magnltude at the negatlve charge an an electron the attractlun by an atcrn tar electrcne W a chemlcal band. the megnltude of the negatlve charge an a mnlecule. Scare: Whlch 1/1 l5 an acceptable descnptlun at a nencclar covalent band? . A band that cccurs when the bundlng electrcne are shared between atoms ct the same electrnnegatlvlty. student Response Correct Answer A band that uccurs when the bundlng electrcna are between twc atcrne wlth drrtenng electrunegatlvltles and theretcre cne atom can attract the bandlng electrcna rncre strungly. . A band that cccurs when an electrnn l5 transferred frcrn one atcrn tc anctherr . A band that occurs when all the aturns peel thelr valence electrens lntu an evenly dlstnbuted sea at electrons that Flaws between and aruund the Ian cares and attracts them together . none of these Scare: which 1/1 camblnatian nf elements wuuld be most likely tn Farm ianlc bands? WP??? student Response Correct Answer oxygentflunrlne sulfursoxygen petaaaldrnctarernlne brcmlne- lcdlne cartmn-chlcnne Scare: which 1/1 at the rcllcwlng cumpuunds dlsplays the greatest ienlc character in its hands? ["99 Stud ent Respoll 5e Correct Answer N02 co2 H20 HF NH3 Scare: Whlch lfl element beluw has the must metalllc character? l-nUan student nesponse Correct Answer Er El 5 Li F r Scare: Whlch III of the fallcwlng la the correct furrnula for rubldlurn nxlde? . szo student Response Correct Answer RJJO R1302 . @203 Rbaoz Scare: Whlch 1/1 of the fallawmg cantalns covalent bands? 7'9an student Response Correct Answer Bao IBr Mg LlEr Cu 5 Scare: 1/1 CQHWZP started: November 19, mm 5:51 PM Submltted: November 19, 2010 5:51 PM Tlrrie spent: 00:0 :04 Total score: 0/12 = 0% Done 1. The enthalpy change that accompanies Hsci bond formation IS the same in magnitude but oppuslte lri sign as the AH vaiue for bmakmg an Hsci bond. student Response Value Correct Answer Feedback A True a e Faise Score: 0/1 2. Predict which of the following bonds would he the shortest student Response Value Correct Answer Feedback A CsCI a QC c c=c D (EC M E cisci Score: 0/1 3. What IS the NO bond order in HECNO2 (assume all atoms obey the cctet rule)? student Response Value correct Answer Feedback A 1 e 2 c 1.33 o 1.5 a E 3 Score: 0/1 4. caicuiate AHDM‘ for the decomposition of tetrazene, N4H4 (atom sequence HZNNNNHZ) to hydrazine (N2H4) gas and dlriitrogeri gas. student Response Value correct Answer Feedback A 109 kJ/moi El 7357 kJ/rrlol m c sszs kJ/rrlol D 150 ld/rriol E riorie of these l5 Within 5% cf the correct answer. Scnre: 0/1 5. Given the bond energies below, calculate an estimate for AH (id) for the reaction: zoom) + 02(g) —> 2C02(g) Bnrid energy (kl/mol): (2-0, 350; (2:0, 799; CO(trIple bond), 1071; 02, 495 student Response Value Correct Answer Feedback 7929 la i 1269 kJ +929 kl i -47s ld +1042 i -556 la a +473 kl wmmewue Scnre: 0/1 which is an acceptable definition of electronegativity? Sludelll Response Value Correct Answer Feedback A The energy required fur the complete removal of 1 rriol of electrons form 1 mol of gaseous atoms or lUI'lEi e The tendency ofa a bonded atom to hold the lJUridirig electrnris m0re stronglyi C The energy change accompanying the addition of 1 mol of electrons to 1 rriol of gaseous atoms or lUI'lEi o The energy involved when an atom acquires an electron. E none of these Scnre: 0/1 which of the foIIoWing elements. when combined With fluorine, would produce the most polar covalent bond? Student Response Value CorrectAllswer Feedback A: Ru 3 N c a o E Sr :rnre: n/l Select the correct formula for a compound formed from oanurn and nltrogen student Response value correct Answer Feedback EaN EaN2 laaZN3 EaZN BEEN: E mpnmb Score: o/1 How la the partlal lunlc character of a dlatomlc molecule related to the AEN of the bonded atoms? student Response value correct Answer Feedback A The smaller the AEN, the more Ilkely the bond wlll oe lorll: E The lonic character of the bond IE not related to the AEN of the bonded atomsl c The greater the AEN, a the more Ilkely the bond wlll oe mm: D The greater the AEN, the more covalent the bond El nnne of these Score: 0/1 111. In wl'ncl'l or theee substances are the atoms held together by metamo bandlng? student Response Value Correct Answer Feedback coI s: Er2 opmo so E Cr 5 Score: oil 11. Ionl: compounds normally oonouot electrlclty student Response value correct Answer Feedback A When In the solld state a only when rnolten when in aqueous a SOIL”:an or molten. or only when ll'l aoueoue snlutlnn. El when a eono or .n aqueous solutlon‘ Score: 0/1 12. Wl’llCh one of the following IS not characterlstlc of substances composed of small, covalentlyrbonded molecules? Studenl Response Value Correcl Answer Feedback low meltlng poll’ll: low oomng pnll’ll: weak bonds a poor eleotnoal oonouotor when solld pnpub F” poor electrlcal conductor when molten Score: 0/1 C9HW2P Started: November 19, 2010 5:53 PM Submitted: November 19, 2010 5:53 PM Time Spent: 00:00:07 Total Score: Ell! : 0% Done 1. Use the perlndlc table only and arrange the members or this set in order at increasing tmnd strength Sci, SsBr, secl student Response Value Correct Answer Feedback SI (SsBr (srcl a 8-1 s S-Cl < S-Er SsCI < 5*! < SsEr S-Br < S-Cl < s-l mongol: none of these Scare: U/l Whlch of the following lists has the bonds ordered from shortest to longest? student Response Value Correct Answer Feedback cecl, 01, OF, car car, cecl. 0F, 01 OF, cecl, CsEr, Cs[ m 01, car. cecl, csF CsI, cecl, CsEr, CsF mpnmb Score: 0/1 All at the toiiowmg molecules contain only single hands except student Response Value Correct Answer Feedback H202 cl2 CH4 soZ a H20 mp0s? Score: 0/1 Xenon forms several compounds, mostly with the highlyl electrohegetlve elements oxygen and fluorine The fluorides XeFE is formed by direct reaction of the elements. As you might expect from the size of the xenon atom, the XecF bond is not a strong one Calculate the XecF bond energy in XeFE, given that its heat of tormetlorl is 7402 kJ/mnli student Response Value Correct Answer Feedback A 145 ld/mol m E 7146 kJ/mm c 94 kJ/rncr Dr 794 KJ/rnol E 757 kJ/rncr Scare: 0/1 Acety‘ene gas (Cit—12) burns wrth oxygen m an oxyacetylene torch to produce carbon draxrde, water vapor. and the great heat needed for we‘ding metals The heat of combustron of acety‘ene rs 1259 kamuL Estrrnate the bend energy of the carbunccarbun thpre band In acetylene. Student Response Value Current Answer Feedback 1271 Lamar —1271 kJ/rnm 7800 kJ/mm sun kJ/rnnl nane of these is wrthrn & 5% Hf the current answer msnmb Score: U/l Use the perrodrc table on‘y and arrange the elements \n thrs set in order ofmcreasmg EN 1, Br, N Student Response Value Correct Answer Feedback A 1 < Br < N Q at Er <1 < N c N < Br <1 DrN<I<Er Er nane of these Scare: 0/1 echerder an H-C tmnd In an crganrc compound. Based on the electrcnegatwrtres at the twn erernehte, which at the rcncwrhg best descrrhes the net charge an the carhcn atcrn? Student Response Value Correct Answer Feedback A no paranzatrcn at the band, I e hc net charge a a M negatwe charge Q a M posrtwe charge D a partral negative Q charge E a partral pusltlve charge Scare: 0/1 Select the correct formula for a compound formed from calclum and chlorlnel Student Ilespnnse Value Correct Answer Feedback A Cacl Bl Cacl2 a cl CaZCl D C32ch E Cacl3 Scare: 0/1 9. Based on electronegatlvlty trends m the perledrc table, predlct whrch at the tellswrhg compounds wlll have the greatest nil. lehle character lh lts bonds Student Response Value Correct Answer Feedback Al HCl Bl ca]2 c Cacl2 Dr 5er a El SrCI2 Score: 0/1 1D. The rneltlng pnll’lts ct metals are chly mcderately hrgh because student Response Value Correct Answer Feedback A metalllc bonding ls weak. B metals have fewer bonding electrons tl'lan nonrmetals. C metals also have relatlvely low lJUllll’lg polnts. or the meltlhg process a does not break the rnetalllc bonds El metals preter to be bonded tn nan-metals Score: 0/1 11. whlch of the fullnwlng rs ah lcruc ccmpcund? student Response Value Correct Answer Feedback A H25 B NH3 c 12 Dr K1 5 E ccl4 Scare: 0/1 12. wnlch one of the following propertles is least characteristh of typlcal lonlc compounds? Student Response Value Correct Answer Feedback A high rneltlng polnt s hrgh balllng pclht Cl brlttleness D pour electrrcal conductor wl‘lerl snlid El pnnr electrrcal a conductor when molten Scare: 0/1 Fcr sungre bands between srrnllar types at atdms, tne strength or the envarent bond .s generarry drrestry pmpnrtmnal tn tne srze or the bonded atcrns. Student Response Value Correct Answer Feedback A. True 5. Parse 5 genre: 0/1 2. use the perrodrc table unry and arrange the members of each set rn srder er rncreasrng bond length C:N, C-N, C-C Student Response Value Correct Answer Feedback A. C-C < C:N < C-N a. C=N < on < crc Q C. C-N < C:N < C-C D. C’N < C’C < C=N E. none of these Scare: 0/1 3. Arrange the specres In order ormcreasmg carbonsoxygen bond strength. In [/4039] don't consrder the CsOsH carbonsoxygen bond. Student Response Value Correct Answer Feedback A- co < Hzco < cof’ < HCOB’ < CH40 5- 5032' < Hzco < co < CHaO < HCO{ 2. C- cnao < co3 < 5 Hcoa’ < HECO < co 0- HCOS’ < HZCO < CHAD < cosz' < co E. none of these Score: 0/1 4-. Estrrnete the standard enthaer enange AH for the reactron eeruw: C2H5(g) + C\2(g) => CZHECKQ) + Hcrrg) Data: Ednd energies rn kJ/mdr: 5-6, 343; C-H, 414; 0-51, 242; (2-0, 327; H-Cl, 431 Student Response Value Correct Answer Feedback A. -113 kJ/mdr B. ’68 KJ/rnor (2. -1oz kJ/mdr a D. 7344 kJ/rnm E. 276 kJ/mdr Score: Ufl 5. Carcurate AH”mm fer the decampcsltmn at tetralehe, NAHA (atnrn sequence HENNNNHE) td hydralrne (N2H4) gas and drnltmgen gas. Student Response Value Correct Answer Feedback A 7109 Kl/‘mol B. 7367 KJ/rnol Q c 7525 Kl/‘mol D. 150 karnm E none of these rs wrthrn 5% of the correct answer. Score: 0/1 6. Whrch of the foHowrng orders of e‘ectronegatrvity is incorrect? student Response Value Correct Answer Feedback A. 51 < P < N B Se < S < O C. I < C‘ < P D N < P < S Q E. 51 < N < 0 Score: 0/1 7. Whrch of the foHowrng bonds has the greatest ronrc character? Student Response Value Correct Answer Feedback A. Kncr & B. C-F c. MgnN D. 51-51 E. C’H Scare: 0/1 8. In whrch of these substances are the atoms held together by polar covalent bondrhg? Student Response Value Correct Answer Feedback A. srcr2 B CSC‘ c. CH: a D. Tle E. 55 Score: 0/1 Haw Is the partlal lunlc character at a dlatumlc molecule related to the AEN at the banded atul'ns? Sludent Response Value Correct Answer Feedback A. The smaller the AEN, the more Ilker the bond will be lanlc. E. The mth Character at the band Is not related to the AEN of the bonded atoms. C. The greater the AEN, a the more Ilker the bond wlll oe lonlc D. The greater the AEN, the more covalent the bond. E. none of these Score: 0/1 In. Which cf the following elements has the greatest metalllc character? Sludent Response Value Correct Answer Feedback Score: 0/1 11. Iul’llc compounds normally conduct electnclty Student Response value Correct Answer Feedback A. when ln the solid state. a. only when molten C. when ln aqueous a Salutlnh or mnlten. B. only when ln aqueous salutlan. E. when a sold or ln aqueous solutlon Scare: 0/1 11. Analyle or an unknown substance showed that lt has a moderate meltlhg polnt and ls a good conductor of heat and electrlclty ln the solld phase. whlch 0f the fallnwlng substances would have these characterlstlcs? Analysls of an unknown suostance showed that lt has a moderate melting polnt and ls a Quad conductor of heat and electnclty ln the solld phase. whlch or the followan suostances would have those Characterlstlcs? Studenl Response Value Correcl Answer Feedback NaCl Sl ccl4 1: Ga w 0190.07? Score: 0/1 thch et the telleWIng statements Is cerrect when descrIeIng the InteractIens that eccur hetween ll’ldlvldual chlenne atems as they apereach each ether and term Clz? Studenl Response Value Oorrecl Answer Feedback A A5 twu Chlurlrle atoms approach each other, each atuml: nucleus starts tn attract the uther‘s electren, thch raIses the petentIal energy of the system El A5 attractIens a Increase, se de repulslens hetween the nuclei and between electrons C At some Irlterhuclear dIstance, the maxlmum attractlorl is achleved In splte er the repulslene, and the system Is at Its hIghest energy. D The mutual attractml’l Uf l'luclel and electron paIr In the twe chlorlne atoms constitutes the lani: bnrldl E rlurle uf these Score: 0/1 Use the perIedIc table enly and arrange the members et each set In erder et IncreasIng hend length C:N. C’N, C’C Student Response Value Correct Answer Feedback C’C < C=N < CsN C:N < C-N < C-C a on < C=N < cec C-N < c-c < C:N mange): rlurle uf these Score: Ufl Bend energIes can be cemtnned wlth values ter ether atemIc prupertles te ehtaIn AH values that cannet be measured dIrectly Use hend energy, lurllzatlurl energy, and electren athnIty values hem your text to Calculate the AH fur the lul’llc dlssuclatlurl uf CID: 02(9) 2 mg) + We) Student Response Value Correct Answer Feedback 1949 ld/mel —1s4s kl/rrlnl 1150 ld/mel a —1150 kJ/rrlnl l'lnrle 5F these are Wlthlrl 5% cf the correct al'lswer mpnpub Score: Ufl Hydragenatlun et deuele and tnple bends Is an Impertant Industnal crecess. Calculate (In K1) the standard enthalpy change AH” ter the hydregenatIen et ethyne (acetylene) te ethane (czns) C2H2(§l + Hzm) :> CzHem) Balance the equatlen and censult yeur text fer the needed eend energIes student Response Value Correct Answer Feedback -295 la a ’51 K] 51 kl 296 kl 331 kl msowe Score: Ufl Acetene can he easIly cenyerted te Iseereeyl alcehel ey addItIen et hydregen te the carbunwxygeh deuele hend Calculate the enthalpy et reactIen usIng the hend energIes gIven O 0—H H,c—c—cn;(g) + H102) —I- ch—c—mjm H Bond: C=0 H’H C’H 07H C’C CiO Band energy(kamul) 745 436 414 464 347 351 student Response Value Correct Answer Feedback -4E4 kl *365 kl -4e kl e +48 kl +355 kl H1570??? Score: Ufl EIectrenegatIVIty Is a measure et Studenl Response Value Oorrecl Answer Feedback A the energy needed te remove EH electron fmm an atom. a the energy released when an electron is added to an atom c the magnitude of the negative charge on an electron D the attractieh by an Q atom for electrons in a chemical bond E the magnitude of the negative charge on a molecule Score: 0/1 which is the most polar band? student Response Value Correct Answer Feedback IcBr Kscl & sro orcl FcF mcnws Score: 0/1 Match this substance With the phrase that correctly describes its bondsi ai ionic bi nonpolar covalent c pelar covalent 502 (EnterJust the letter) student Response Value Correct Answer 1 not answered 0% Contains c (100%) Score: Ufl Rank the members et this set et Compounds in erder ems-creasing ienic character et their bends Use partial charges to indicate the bend pelarity er each bend SEFA, TeFa, Erl:3 student Response Value Correct Answer Feedback A TecF > SecF > BrcF Q 5* 3' 3+ .3- 3+ .3- Bi Se-F >Te-F a Er-F 5+ 3' 3+ .3- 3+ .3- Ci BrsF > SesF >Tesl: 5’ 5+ 6’ 5+ 6’ 5* Di SesF > Brsl: >Tesl: 5’ 6+ 5’ 6+ 5’ 6* E none of these Score: 0/1 10. which one or the followmg properties is least characteristic of typical metals? student Response Value Correct Answer Feedback A moderately high melting point a high boiling point brittleness a o good electrical conductor when selid Ei good electrical canductnr when molten Score: 0/1 11. which of the tellewmg is the cerrect formula ter magnesium nitride? student Response Value Correct Answer Feedback MgNo3 Mg(N03)2 MgN M92N3 mpnmb MgziN: & Score: 0/1 12. Select the element whose LEWlE symbol is correct. studentResponse Value CorrectAnswer Feedback A .Fy. Bi IRflp & C cm,- Di :Tc: Ei He' Score: 0/1 Predlct which cf the following bonds has the greatest band energy. Student Response Value CDrreCl Answer Feedback A. C’C‘ E. C-C C. C:C D. (EC E E. CI-Cl Sccre: 0/1 2. Order the tsllcwrng by decreasmg tmhd length: cc tnple hcnd, C:c, c-c Student Response Value Correct Answer Feedback A. they are all the same B. cc trlple band, C: C’C :2. cc trlple bend, cnc, C=C D. C-C, c:c, cc trlple E band E. C:C, C’C, CC trlple band Sccre: 0/1 3. Hand energles can be camblhed wlth values ter ether atnmlc pmpertlee t0 Ubtalrl AH values that cannot be measured dlrectly. 0se pend energy, lnrllZatmrl energy, and electrcn affirllty values tram ynur text tn Calculate the AH tar the lnnlc dlsenclatml’l Uf Clz: 02(9) :> CW9) + CW9) Student Response Value Correct Answer Feedback 1348 kJ/rrml s1e4e ld/mcl 1150 ld/mcl E 1150 ld/mcl rml'le 0f these are Wlthll’l 5% Uf the Currect answer T995“? Scare: U/l Nltmgen and hydrcgen ccmhlne tc term ammul'lla W the Haber prccess Calculate (In k1) the standard enthalpy change AH” ter the reactlcn wntten helcw, uslrlg the band energles glven N2cg) + 3M9) — Wham) Bond: N N H’H N’H Bond energy (kJ/mol): 945 432 391 Student Response Value CDrreCl Answer Feedback -969 kl *ZU4k] slflS kl E 204K] E. 595 k] .00.“? Score: 0/1 Estlrnate the standard enthalpy change AH tcr the reactlen beluw: CzHam) + HZCQ) :>C2Hfi(g) Data: Ecnd energles ln kJ/mul: >444, 432; C44, 415; sec, 345; csc, s15 Student Response value correct Answer Feedback 7250 k] V150 kl e12e k] 5 +s74la E. 7229 k] .30.”? Score: 0/1 Use the perludl: table cnly and arrange the elements .n thls set .n crder uF decreasing EN [,F,O Student Response Value Correcl Answer Feedback . F > 0 >1 5 . 0 >1 > F A E C.I>F>O D.Fa1ao E . nene cf these Scere: 0/1 whlch crder ls ccrrect rer lncreaslng pelanty (least pclar first)? Student Response value Correct Answer Feedback A < D < c < e c < e <A e < A < D D < e < c a B < c < D .505“? 13an AAAA Score: 0/1 Match the substance wlth the phrase that ccrrectly descrlbes lts hands. a lcnlc b nenpclar covalent c pelar cevalent BFE (Enterjuet the letter) 1:1. 11. 12. 1 student Response Value nut answered 0% Correct Answer cantalns c (100%) Score: on Haw Is the partlal lul’llc character or a dlatumlc mulecule related to the AEN or the buhded atoms.7 A. E. c. D. E. student Response value correct Answer The smaller the AEN, the more Ilker the band le be lDrllC The lul'llc character cf the band Is not related to the AEN or the bonded atums. The greater the AEN, m the more ely the band w. be lurllc The greater the AEN, the mere cevaleht the bend. none of these Feedback Score: 0/1 whlch statement l5 not a correct descrlptlan er metals and nonmetals? student Response Value Correct Answer Metals tend to galn a electrons rn reactluns wlth nenrhetals . Metals have a characterlstlc luster whlle huhmetals have dull surfaces Metals typlcally have hlgh meltlng pulnts whlle nenrnetals generally have law meltlng pulnts Metals are gnad electrlcal canductnrs whlla nanmetals are poor electrlcal conductors. . all the above are correct Feedback lenlc Score: 0/1 compounds normally conduct electrlclty A. E. c. E. student Response Value Correct Answer when ln the sulld state. unly when molten when n aqueous a when a snlld m rn aqueous sulutlun. Feedback Scare: 0/1 which of the fallnwirlg inns has an unusual or incnrrect charge? A. E. C. D. E. student Response Value Correct Answer Tez' Ball» RI314. Fa la Al3+ Feedback Scare : 0/1 Which of the following bands is weakest? Student Response Value Correct Answer Feedback P-P Psi: P-Ci Prar P-I & WPOW?’ Score: Ufl Predict which of the following bends would be the longest Student Response Value Correct Answer Feedback H-H OH c-c & C:C WPOW?’ (2C Scare: 0/1 which at the tsiisWing statements concerning estimating AH from bond energies is incorrect? Studenl Response Value Correct Answer Feedback A Bond breaking is endothermic (cos) a. Band making is exothermic (neg). C. aond energies must be multiplied by the number of each band and the number of moles of the species in the balanced equation Di Borid energies are average values. E The sum or the band 5 energies of the reactants is subtracted from the Sum of the bond energies of the products. Score: Ufl Hydrogenation of dnubie and tripie bonds is an important industrial process. Caicdiate (in la) the standard enthalpy change AH° tor the hydrogenation orethyne (acetylene) to ethane (czhfi). Cszlg) + HQ) :> CzHam) Balance the equation and consult your text for the needed bond energiesi student Response value correct Answer Feedback A. 7295 la a E ’51 kl Q 51 K] D 296 id E 381 K] Score: 0/1 Given the bond energies below, calculate an estimate fnrAH (id) tor the reaction: 2C0(g) + 02(g) s> 2C02(g) aond energy (id/moi): c-o, 350; c:o, 799; co(tripie band), 1071; 02, 493 Student Response Value Correct Answer Feedback 1 7923 id 1 -1259 kl 3 +eze id 4 -473 kJ 5. +1042 ts. -555 kJ & 7i +478 k.) Scare: 0/1 which of the folioWing orders of electronegativity is incorrect? student Response value correct Answer Feedback Ai Si < P < N E Se < S < 0 Q I < Ci < P 0 N < P < 5 5 E Si < N < 0 Score: 0/1 which is an acceptable description of a nonooiar coyaient band? Sludenl Response Value Cnrrect Answer Feedback Al A bond that nccurs when the bondlng electrons are between two atoms Wlttl dlfferlng electronegatlvltles and therefore one atom can attract the tmndlng electrons more etmngly B A bond that occurs when an electron l5 transferred from one atom to anotherl c A bond that nccurs a when the bondlng electrons are shared between atoms of the same electronegatlvlty D A bond that occurs when all the atoms pool thelrvalence electrons into an evenly distrlbuted sea of electrons that flows between and around the lDl’l cores and attracts them tngethen El none of these Scare: 0/1 Of the three major types of bondlng (lonlc, covalent, metalllc) whlch ones are based on electrostatic attractlons between opposite charges? student Response value correct Answer Feedback A only ionlc bonding a urllylonlc and covalent bundlng or only mnlc and metalllc bondlng Dr lonlc, covalent and Q metalllc banding El none of the above Scare: 0/1 Rank the members of thls set of compounds ln order ofdecreasing lonlc character of thelr bondsl Use partlal charges to lndlcate the bond polarlty of each bondl SeFA, TeF4, ErF3 student nesponse Value Correct Answer Feedback A TenF > SerF > ErrF E 6* 6’ 6+ 6’ 6+ 6’ B SerF >TerF > BrrF 5+ 5’ 5+ 6’ 5+ 6’ c ErrF > SerF >TerF 8’ 5+ 8’ 5+ 8’ 5+ Dl Se-F > Br-F > Te-F 5’ 5+ 5’ 5+ 5’ 5* El none of these Score: on 10. For whlch of the folloWlng elements (ln thelr normal, stable. forms) would lt be correct to describe the bonding as lnvolvlng "electron pooling"? Student Iespollse Value Correct Answer Feedback l hydrogen l nellurrl l lodlne A B Q sulfur D E l alumlnum M Score: on 11. Whlch of the folloWlng ls the correct formula for rubldlum oxide? student Response value correct Answer Feedback RbO Rho2 R1320 a hao3 R1330: WPOWP Score: 0/1 11. Select the element whose LEWIS symtml l5 correct. student Response Value Correct Answer Feedback .Fr- «Ra: e .ph. :Tc: He' POW? F” Score: 0/1 ...
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This note was uploaded on 03/30/2011 for the course CHEM 1331 taught by Professor Bott during the Fall '08 term at University of Houston.

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