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52 Multiple Choice Problem Solving in Chemistry - Final Exam | CHEM 108, Exams of Chemistry

Material Type: Exam; Class: Problem Solving in Chemistry; Subject: Chemistry; University: Penn State - Main Campus; Term: Unknown 1989;

Typology: Exams

Pre 2010

Uploaded on 09/24/2009

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Chemistry 108
Practice Final
1. The boiling point of HCl(l) is higher than the boiling point of Ar(l) as a result of
(a) hydrogen b onding
(b) higher formula mass
(c) stronge r London forces
(d) perman ent dipole forces
(e) ion-ion forces
2. Which of the following truly describes the atmosphere?
(a) Temperature increases in regular way with increasing altitude.
(b) Pressure increases in a regular way with increasing altitude.
(c) Concentra tions of all major air pollutants increase in a regular way with
increasing altitude.
(d) Temperatur e decreases in a regular way with increasing altitude
(e) Pressure decreases in a regular way with increasing altitude.
3. Which of the following molecules will have the largest dipole moment?
(a) CS2
(b) SF6
(c) XeF2
(d) BF3
(e) OF2
4. Which of the following substances has the strongest interm olecular attractions?
(a) He, boiling point !268.6°C
(b) Ne, boiling point !245.9°C
(c) Ar, boiling point !185.7°C
(d) Kr, b oiling point !152.3°C
(e) All have equally strong intermolecular attractions.
5. The molecular shape of AsF5 is expected to be
(a) trigonal bipyramidal
(b) T-shaped
(c) octahedral
(d) tetrahed ral
(e) square planar
2
6. What is the predominant intermolecular force in carbon tetrachloride, C Cl4?
(a) London dispersion force
(b) ion-dipole attraction
(c) ionic bonding
(d) dipole-dipole attraction
(e) hydrogen- bonding
7. Given the following samples of gases
N2 N2 O2 N2
1.0 atm 0.5 atm 1.0 atm 0.5 atm
0°C 0°C 0°C 20°C
I II II I IV
Which of the following statements are false?
1. I and II have the same averag e kinetic energy.
2. II and IV have the same ave rage kinetic energy.
3. I has a higher average speed than III.
4. I has a higher average speed than II.
(a) 1 and 2 are false
(b) 1 and 3 are false
(c) 1 and 4 are false
(d) 2 and 3 are false
(e) 2 and 4 are false
8. Place the following in order of increasing first ionization energy
F, O, Ne, Cs, Rb, Fe.
(a) F < O < Ne < Cs < Rb < Fe
(b) Fe < Ne < O < F < Cs < Rb
(c) Cs < Rb < Fe < O < F < Ne
(d) Ne < Fe < Cs < Rb < O < F
(e) Cs < Rb < O < Fe < F < Ne
pf3
pf4
pf5
pf8

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Chemistry 108 Practice Final

  1. The boiling point of HCl(l) is higher than the boiling point of Ar(l) as a result of ( (a)b) hhyigdhreorg feonr (^) mbounlad imngass ( (cd)) spterormnganere Lnto dnidpoonle f oforcrecess (e) ion-ion forces
  2. Which of the following truly describes the atmosphere? (a) Temperature increases in regular way with increasing altitude. ( (bc)) PCroenscsuenretr iantciorenass oesf ianll am rajegour laarir wpayoll (^) uwtanitht (^) si nincrcereasasineg i (^) na lati truedgeu.lar way with increasing altitude. ( (de)) TPeremspsuerrea tduercer (^) edasecerse asine as rineg au rlareg uwlaray w wayith w initchre iasncirnegas ailntigt (^) uadlteit.ude
  3. Which of the following molecules will have the largest dipole moment?

(a) CS 2 (b) SF 6 (c) XeF 2 (d) BF 3 (e) OF 2

  1. Which of the following substances has the strongest intermolecular attractions? (a) He, boiling point !268. 6 °C ( (bc)) NAre,, bbooiilliinngg ppooiinntt !!185.245. 79 °°CC (d) Kr, boiling point !152. 3 °C (e) All have equally strong intermolecular attractions.
  2. The molecular shape of AsF 5 is expected to be (a) trigonal bipyramidal ( (bc)) To-cstahhapededral ( (de)) tsequtraharee dprlaanlar 6. What is the predominant intermolecular force in carbon tetrachloride, CCl 4? ( (a)b) Lioonn-ddoipno dlei satpetrracsiotino (^) nforce ( (cd)) idoinpiocl (^) eb-odnipdoinleg attraction (e) hydrogen-bonding 7. Given the following samples of gases

N 2 N 2 O 2 N 2

  1. 0 atm 0. 5 atm 1. 0 atm 0. 5 atm 0 °C 0 °C 0 °C 20 °C I II III IV Which of the following statements are false?
    1. II (^) Ian andd I II (^) Vh avhaev teh teh sea smame aev aevreargaeg kei knientiect (^) iecn eenregryg.y.
    1. II hhasas aa hhiigghheerr aavveerraaggee ssppeeeedd tthhanan IIIII.. (a) 1 and 2 are false ( (bc)) 11 anandd 34 araree ffaallssee ( (de)) 22 anandd 34 araree ffaallssee
  2. P Fl,a Oce, Nthee, fCosll, oRwbi,n Fge i.n order of increasing first ionization energy (a) F < O < Ne < Cs < Rb < Fe ( (bc)) FCes << NRbe << OFe < < F O < < C Fs << (^) NRbe ( (de)) NCse << RFbe << COs < < F Reb < < F O < <N Fe
  1. Which one of the following species has as many electrons as it has neutrons? (a) 1 H (b) 40 Ca^2 + (c) 14 C (d) 19 F! (e) 35 S^2!
  2. A real gas, such as CO 2 , is expected to show ideal behavior ( (a)b) wath leonw a t (^) elimqupider iast (^) uprree.sent. ( (cd)) atat (^) lhoigwh pprreessssuurree an andd h liogwh tteemmppeerraattuurree.. (e) at high pressure.
  3. The balanced homogeneous vapor-phase reaction G + H Q + Z has Kc = 5. 3 x 10!^4. At equilibrium ( (a)b) preracodtuancttss ddoommiinnatatee.. ( (cd)) aopnplyr opxriomdatucetlsy eexquista.l molar amounts of reactants and products are present. (e) only reactants exist.
  4. The bond angles in NO 3!^ are expected to be (a) 90 ° (b) 107 ° (c) 109. 5 ° (d) 120 ° (e) 180 °
    1. Ethanol and gasoline (assumed to be all octane, C 8 H 18 ) are both used as au ethtoanmool thivave (^) efu teol sb. (^) e Ifto g pasroolvinidee i st (^) hsee lslianmg (^) efo arm $1.ou27/nt ogfa lhloeatn wpherat d wololarul db (^) astheed p ornic et (^) hoef following data? octane ethanol enthalpy of combustion, kJ/gram !47. 89 !29. 69 density, g/mL 0. 7025 0. 7894 one gallon = 3. 785 L (hint: you don’t need this to solve the problem) ( (a)b) $0.$0. (^4564) ( (cd)) $0.$0. (^7088) (e) $1. 43
    2. Consider the following reaction and conditions: CO(g) + 3 H 2 (g) CH 4 (g) + H 2 O(g) Kc = 3. 89 [CH 4 ] = 0. 047 M [CO] = 0. 033 M [H 2 O] = 0. 058 M [H 2 ] = 0. 156 M At these conditions, which one of the following statements is true? ( (a)b) TThhee rreeacacttiioonn mmuusstt pprroocceeeedd ttoo tthhee rleigfth tto t oa (^) tatattiain ne (^) quequiliiblirbiurimum.. ( (cd)) TThhee reequacitliiobnri (^) uism at s etatquuisli bcanriunmot. be determined from the given information. (e) Addition of a catalyst will shift the equilibrium to the left.
  1. T hhyed (^) rLoegweins fboornmdu tloa so fthore (^) rf imveo mleoculelecsu loefs tarhee sgaimveen k bineldo?w. Which molecule can (a)

H C

H H H (b) H^ H (c) H^ C^ N (d) H C H H O H (e) C O

H H

  1. At 0 °C, 5 moles of O 2 , 2 moles of N 2 and 1 mole of Cl 2 are mixed in a 40 liter flask. Assuming ideal behavior, the total pressure of the mixture is (a) 44. 8 atm. ( (bc)) 4.2. 4880 atatmm.. ( (de)) 1.0. 1256 atatmm..

Refer to the following diagram to answer the next two questions.

P • T

R Temp.

E • Z • Y • X

S S

U

R • W • V

E

Temperature time

  1. R wehfiecrhr icnhgan tog (^) eth?e phase diagram, the graph of temperature against time shows (a) X to Y ( (bc)) WV ttoo WV ( (de)) XZ ttoo ZX
  2. Which phase(s) is(are) present at point T? (a) gas ( (bc)) lsioqluidid ( (de)) bbootthh lsioqluidid an andd l (^) igqasuid
  3. The most common ion formed by calcium is: (a) Ca^2 + (b) Ca^2! (c) Ca! (d) Ca+ (e) Ca^3 +
  1. In which of the following solutions is molality most nearly equal to molarity? (a) 0. 30 M aqueous KI (b) 0. 030 M aqueous KI (c) 0. 30 M KI in CH 3 OH (The density of CH 3 OH is 0. 791 g/cm^3 .) (d) 0. 030 M KI in CH 3 OH (e) Molality is never nearly equal to molarity.
  2. What is the formal charge of sulfur in SO 32!^? ( (a)b) ++ (^21) ( (cd)) (^0) - 2 (e) - 6
  3. The noble gases are monatomic, consisting of single atoms. The reason the noble gases don’t really form compounds is: ( (a)b) TThheeiyr aiorne itzatooi osnm ealnle trog bieosn ard.e extremely high. ( (cd)) Ta haneyd aclready have an octet configuration (e) a, b and c
  4. A ni (^) t (^200) rate m toL psroleucitpioitnat ceo naltlai thnein pgh pohspohspatheat ieo (^) nios.n sWh is tatre awtased twheit ho (^) reingionuagl hp (^) hsoolsipdh catalecium c pornecceipnittatratioionn? if 0.277g of calcium nitrate is exactly needed to complete the

(a) 8. 44 x 10!^3 M (b) 5. 63 x 10!^3 M (c) 3. 38 x 10!^3 M (d) 1. 69 x 10!^3 M (e) 1. 13 x 10!^3 M

  1. A basldiesh fyodr etsh (^) ear Teo clalepnab’s ltee ostf, ruesdeduc tion gid seilnvteifry i othnes ptor (^) essheinncye s oilfv tehre m aeldtaleh. (^) yTdhei sf (^) uisn tchtieonal g Troolluepn (^) ’isn t (^) eosrtg?anic compounds. Which one(s) of the following will give a positive

( (a)b) (^1) 2, 3 ( (cd)) 2,1, (^54) (e) none: all of them are able to form H- bonds.

C

C

H

C

O

OH

C

O

H

C

O

OH

C

O

N

H

CH 3

CH 3 CH

OH

CH 2 C^ O

OCH 3

CH 2 OH

CH OH

CH OH

C O H

  1. T mhues fto bremula of a salt is XCl 2. The metal ion in the salt has 28 electrons. The metal

(a) Ni ( (bc)) FVe ( (de)) PZdn

  1. A solution of MX prepared by dissolving 0. 020 moles of MX in 115g of water freezes at !0. 65 °C. The material MX is (Kf = 1. 86 °C/m for water) (a) a non electrolyte ( (bc)) aa wsteroakng e leelcetcrtorloyltyete (d) not determinable from this information
  2. The number of unpaired electrons in the lowest energy state of the boron atom (B) is: ( (a)b) (^12) ( (cd)) (^34) (e) 5
  3. T Whhreeen sao sluoltuiotniosn, loabf eslilevde (^) rA n, (^) iBt,r (^) ataned i (^) sC a,d edacedh ctoo nsataminp (^) lae ds iofffe Are,n Bt, uannkdn Co,w an p sroelcuipteit.ate

occurs with A and B but not with C. When a solution of (NH 4 ) 2 SO 4 is added to s paomsspibleilsi (^) toief (^) sA, w, Bh,i (^) canh do (^) nCe, ias pcorencsiipsitteatnet wocicthu rtsh (^) eo nelxyp weriitmh (^) eCn. (^) talA mobosnegrv tahteio fnosll?owing A B C (a) NaNO 3 Na 2 S NaCl (b) KI NaCl NaNO 3 (c) Na 2 S NaCl Ba(NO 3 ) 2 (d) NH 4 NO 3 BaCl 2 Pb(NO 3 ) 2 (e) NaNO 3 NH 4 NO 3 Pb(NO 3 ) 2

  1. The molecule NO 2!^ contains delocalized &-electrons. (a) True (b) False
  2. A of 'at boomnidc iosr a h sytbrorindg eorr (^) bbiotanlds anthdan b aec &au bsoen tdh (^) ebreec aisu mse (^) oorfe thelee (^) cgtrreoant edre enfsfietcyt idvier (^) eocvtleyrlap betwe (ea)n the boTnrdueed nuclei.(b) False
  3. If the mole fraction of a gas in a mixture increases, the partial pressure of the gas will inc (a)re ase. True (b) False
  4. The volume of a gas doubles when the temperature in centigrade doubles if all other v (a)ar iables (^) Tarrue (^) eh eld const(anb) t. False
  5. The formation of nitrogen atoms from the reaction of N 2 +^ with electrons in the atmos (pa)h ere is anTr (^) uexeam ple of (^) (pbh) otoiFoalniszateion.
  6. In the Bohr model of the hydrogen atom, energy is emitted when an electron goes from t (ha)e n= 2 toT trhuee n = 4 level(.b) False
  7. If an electron is in a 4 d orbital, it could have quantum numbers n=3, l=4, ml=0, and ms=!1/2. (a) True (b) False
  8. Alkenes are more reactive than aromatic hydrocarbons because they have delocalized & bonds. (a) True (b) False
  9. The m (ea)lt ing poiTnrtu oef LiF is gr(ebat) er thFanals (^) ethe melting point of KF.
  10. Phosphorus has more metallic character than aluminum. (a) True (b) False
  11. There are 0. 146 moles of Cl!^ in 325 ml of 0. 450 M CuCl 2 (a) True (b) False
  1. At the equivalence point in the neutralization reaction below, the moles of acid = the moles of base. NaOH + HI ( NaI + H 2 O (a) True (b) False
  2. In the balanced equation for the complete combustion of propanol, CH 3 CH 2 CH 2 OH the coefficient for O 2 is 6. (a) True (b) False
  3. The maximum possible number of electrons in the 3d subshell is 10. (a) True (b) False
  4. In the following reaction, the heat of reaction is equal to "Hf of AgCl(s) Ag+(aq) + Cl!^ (aq)! AgCl(s) (a) True (b) False
  5. There are 4 pairs of unshared electrons in H 2 O 2. (a) True (b) False
  6. For the series, Na+, O^2 !, F!: O^2!^ has the smallest radius. (a) True (b) False
  7. For a multi-electron atom, there are five 3 d orbitals which are degenerate. (a) True (b) False
  8. The ' bond joining the two carbons in ethane is the result of the overlap of a p-orbital and an sp^3 hybrid orbital. (a) True (b) False
  9. At high pressure and high temperature, a gas is expected to behave ideally. (a) True (b) False