物理化学实验思考题解答（solutions to problems in physical chemistry experiments）

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1、物理化学实验思考题解答（SolutionstoproblemsinPhysicalChemistryExperiments）ThinkingquestionExperiment1.Determinationofcombustionheat1.whatarethesystemsinthisexperiment?Whataretheenvironments?Isthereaheatexchangebetweenthesystemandtheenvironment?Whataretheeffectsoftheseheatexchangesontheexperi

2、mentalresults?Howtocorrect?Note:thebucketinternalmaterialandspaceforthesystem,inadditiontotheinternaltubmaterialandspacecalorimeterrestenvironment,heatexchangebetweenthesystemandtheenvironment,theheatexchangewillaffecttheaccuracyofdeterminationofheatofcombustion,theReynoldscorrec

3、tioncurvecorrectiontoreduceitsinfluence.2.whyaresolidsamplespressedintoflakes?Howistheamountofnaphthaleneandbenzoicaciddetermined?Tip:pressureintoasheettosamplethefullcombustionofnaphthaleneandbenzoicacid;Determinationoftheamountoflittleerrorislarge,toomuchisnotfullyburning,cande

4、terminethemaximumamountofthesamplesaccordingtothevolumeofoxygenbombandinternaloxygenpressure.3.whatarethecausesoftheburningandburningofthesample?Tip:presstootight,burningwirewillcauseburningintoapill;pressingtooloose,lackofoxygencancauseburningas.Whatarethemainfactorsthataffectth

5、eresultoftheexperimentinthe4.testanalysis?Whatarethekeyfactorsforthesuccessoftheexperiment?Itispointedoutthatthemainfactorsaffectingtheexperimentalresultsarewhetherthesamplecanbefullyburnedandtheheatexchangebetweenthesystemandtheenvironmentcanbeensured.Thekeytothesuccessofthisexp

6、erimentistheappropriateamountofdrugs,theappropriatetightnessofthetablet,thecorrectionofReynoldstemperature.5.whatmattersshouldbepaidattentiontowhenusingoxygencylinderandoxygenpressurereducer?Clew:read"physicalchemistryexperiment"teachingmaterialP217-220Experimenttwodeterminationo

7、frelativemolecularmassbyfreezingpointdepressionmethod1.whatpossiblecausestoocoldtoomuch?Iftoocoldtoo,thefreezingpointofsolutionisloworhigh?Istherelativemolecularweightofnaphthaleneloworhigh?Explainwhy.Answer:coldagenttemperatureistoolowwillcausetoocoldtoo.Iftoocoldtoo,thefreezing

8、pointofaliquidislow.Accordingtotheformul