Thermodynamics exam
questions and answers
updated 2026
ExplainBwhyBtheBbondBenthalpyBofBaBCl-ClBbondBisBgreaterBthanBthatBofBaBBr-
BrBbond.B-BAnswerB-
BBondBisBshorter/bondingBpairBcloserBtoBnucleusB(becauseBClBisBaBsmallerBatom)B
-BThisBmeansBthatBattractionBbetweenBnucleusBandBtoBbondBpairBisBstronger
SuggestBwhyBtheBelectronBaffinityBofBchlorineBisBanBexothermicBchange.B-BAnswerB-
BNetBattractionBbetweenBtheBchlorineBnucleusBandBtheBextraBelectron
StateBwhetherByouBwouldBexpectBtheBvalueBofBtheBtheoreticalBenthalpyBofBlatticeBdis
sociationBforBsilverBchlorideBtoBbeBgreaterBthan,BequalBtoBorBlessBthanBthatBforBsilver
Bbromide.BExplainBAnswer.B-BAnswerB-
BTheoreticalBlatticeBenthalpyBforBsilverBchlorideB->BgreaterB
-BExplanationB-
>BChlorideBionsBareBsmallerBthanBbromide,BmeaningBtheyBareBattractedBmoreBstrongl
yBtoBtheBsilverBions
WhatBisBmeantBbyBtheBtermB'perfectBionicBmodel'?B-
BAnswerBABperfectBionicBmodelBisBwhereBtheBionsBareBperfectBspheres,BwithBonlyBel
ectrostaticBattractionsBbetweenBtheBions.
WhatBdoesBlittleBorBnoBdifferenceBbetweenBexperimentalBandBtheoreticalBlatticeBenth
alpyBvaluesBshow?B-BAnswerBShowsBthatBitBisBaBperfect/nearBperfectBionicBmodel.
WhatBdoesBaBlargeBdifferenceBbetweenBexperimentalBandBtheoreticalBvaluesBshow?B-
BAnswerBShowsBtheBpresenceBofBcovalencyBinBtheBionicBcompound
questions and answers
updated 2026
ExplainBwhyBtheBbondBenthalpyBofBaBCl-ClBbondBisBgreaterBthanBthatBofBaBBr-
BrBbond.B-BAnswerB-
BBondBisBshorter/bondingBpairBcloserBtoBnucleusB(becauseBClBisBaBsmallerBatom)B
-BThisBmeansBthatBattractionBbetweenBnucleusBandBtoBbondBpairBisBstronger
SuggestBwhyBtheBelectronBaffinityBofBchlorineBisBanBexothermicBchange.B-BAnswerB-
BNetBattractionBbetweenBtheBchlorineBnucleusBandBtheBextraBelectron
StateBwhetherByouBwouldBexpectBtheBvalueBofBtheBtheoreticalBenthalpyBofBlatticeBdis
sociationBforBsilverBchlorideBtoBbeBgreaterBthan,BequalBtoBorBlessBthanBthatBforBsilver
Bbromide.BExplainBAnswer.B-BAnswerB-
BTheoreticalBlatticeBenthalpyBforBsilverBchlorideB->BgreaterB
-BExplanationB-
>BChlorideBionsBareBsmallerBthanBbromide,BmeaningBtheyBareBattractedBmoreBstrongl
yBtoBtheBsilverBions
WhatBisBmeantBbyBtheBtermB'perfectBionicBmodel'?B-
BAnswerBABperfectBionicBmodelBisBwhereBtheBionsBareBperfectBspheres,BwithBonlyBel
ectrostaticBattractionsBbetweenBtheBions.
WhatBdoesBlittleBorBnoBdifferenceBbetweenBexperimentalBandBtheoreticalBlatticeBenth
alpyBvaluesBshow?B-BAnswerBShowsBthatBitBisBaBperfect/nearBperfectBionicBmodel.
WhatBdoesBaBlargeBdifferenceBbetweenBexperimentalBandBtheoreticalBvaluesBshow?B-
BAnswerBShowsBtheBpresenceBofBcovalencyBinBtheBionicBcompound