chemteam ap multiple choice - 1994

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1、AdvancedPlacementChemistry1994MultipleChoiceQuestionsNotes:Forallquestionsinvolvingsolutionsand/orchemicalequations,assumethatthesystemisinpurewateratroomtemperatureunlessotherwisenoted.Questions1-4(A)Heisenberguncertaintyprinciple(B)Pauliexclusionprinciple(C)Hund'srule(principleofMaximum

2、multiplicity)(D)Shieldingeffect(E)Wavenatureofmatter1.Canbeusedtopredictthatagaseouscarbonatominitsgroundstateisparamagnetic2.Explainstheexperimentalphenomenonofelectrondiffraction3.Indicatesthatanatomicorbitalcanholdnomorethantwoelectrons4.Predictsthatitisimpossibletodeterminesimultaneou

3、slytheexactpositionandtheexactvelocityofanelectronQuestions5-7refertothephasediagrambelowofapuresubstance.(A)Sublimation(B)Condensation(C)Solvation(D)Fusion(E)Freezing5.Ifthetemperatureincreasesfrom10°Cto60°Cataconstantpressureof0.4atmosphere,whichoftheprocessesoccurs?6.Ifthetemperaturede

4、creasesfrom110°Cto40°Cataconstantpressureof1.1atmospheres,whichoftheprocessesoccurs?7.Ifthepressureincreasesfrom0.5to1.5atmospheresataconstanttemperatureof50°C,whichoftheprocessesoccurs?Questions8-10refertothefollowingdiatomicspecies.(A)Li2(B)B2(C)N2(D)O2(E)F28.Hasthelargestbond-dissociat

5、ionenergy9.Hasabondorderof210.Contains1sigma(s)and2pi(p)bondsQuestions11-13(A)Pb(B)Ca(C)Zn(D)As(E)Na11.UtilizedasacoatingtoprotectFefromcorrosion12.Isaddedtosilicontoenhanceitspropertiesasasemiconductor13.UtilizedasashieldfromsourcesofradiationDirections:Eachofthequestionsorincompletestat

6、ementsbelowisfollowedbyfivesuggestedanswersorcompletions.Selecttheonethatisbestineachcaseandthenfillinthecorrespondingovalontheanswersheet.14.Whichofthefollowingislowerfora1.0-molaraqueoussolutionofanysolutethanitisforpurewater?(A)pH(B)Vaporpressure(C)Freezingpoint(D)Electricalconductivit

7、y(E)Absorptionofvisiblelight15.Inamoleculeinwhichthecentralatomexhibitssp3d2hybridorbitals,theelectronpairsaredirectedtowardthecornersof(A)atetrahedron(B)asquare-basedpyramid(C)atrigonalbipyramid(D)asquare(E)anoctahedron16.CommercialvinegarwastitratedwithNaOHsolutio