experiment c06 determination of the vapor pressure of a 的蒸气压测定实验c06

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1、Name_____________________Class______________Date_________ActivityC06:DeterminetheVaporPressureofaCompound(Pressure,TemperatureSensors)ConceptDataStudioScienceWorkshop(Mac)ScienceWorkshop(Win)PhasechangeC06VaporPressure.DSC06DetermineVaporPressureC06_VAPO.SWSEquipmentNeed

2、edQtyEquipmentNeededQtyPressureSensor(CI-6532A)1Thermometer(SE-9084)1TemperatureSensor(CI-6505A)1Tubing,plastic(w/sensor)1Beaker,400mL2ProtectivegearPSConnector,rubberstopper(w/sensor)1Coupling,quickrelease(w/sensor)1ChemicalsandConsumablesQtyFlask,250mL1Acetone10mLGradu

3、atedcylinder1Ethanol10mLHotplate1Glycerin1mLRubberstopper,two-hole1Water1LWhatDoYouThink?Howdoesthevaporpressureofapureliquidchangeasthetemperatureoftheliquidchanges?Willthetypeofliquidhaveaneffectontherateofchangeofthevaporpressureasthetemperaturechanges?Taketimetoanswe

4、rthe‘WhatDoYouThink?’question(s)intheLabReportsection.BackgroundMostsubstanceshavecharacteristicmeltingandboilingpointsatagivenpressure.Ifthetemperatureofthesurroundingsishigherthanthetemperatureofthesubstance,thesurroundingsgivethermalenergytothemoleculesofmatterthatmak

5、eupthesubstance.Thethermalenergycausesthemoleculestorotate(spin),vibrateandtranslate(movefromplacetoplace).Theintermolecularforcesofattractionthatholdthemoleculesofasubstancetogetherarestrainedbyanincreaseinanymovementofthemolecules.Strongintermolecularforcesofattraction

6、aremoredifficulttobreakandasaresultrequireahighertemperaturetocausemolecularmovement.Thehigherthetemperatureofaliquid,thegreatertheaveragekineticenergyofthemolecules.Whenthemoleculesofsolidmatterabsorbenoughenergy,thesubstancemeltsandformsaliquid.Whenliquidmatterabsorbse

7、noughenergy,themoleculesmovewithenoughspeedandmomentumtoseparatefromeachotherandescapeintothevapororgasphase.Asmoreandmoremoleculesbreakfromtheliquidstateintothevapororgaseousstate,thepressuretheyexertincreasesinaclosedC06©1999PASCOscientificp.41Name_____________________

8、Class______________Date_________system.Thisisthevaporpressureofaliquid.Thevaporpressureofallliquidsisdi