资源描述：
《chemistry lab 2 report density determination：化学实验室报告2密度的测定》由会员上传分享，免费在线阅读，更多相关内容在应用文档-天天文库。
1、Date:Period:Name:Experiment#2“DensityDetermination”PreLabDiscussionChemistryisthestudyofmatter,whichisusuallydefinedasanythingthathasmassandvolume.Youalreadyhavesomeexperiencedeterminingmassinthelaboratory.Inthisexperiment,youwillmeasurevolumesofdifferentmaterials,usingdirect
2、andindirectmethods.Youwillalsousetherelationshipbetweenthemassandvolumeofasubstancetodetermineitsdensity.Volumesofliquidsaremeasureddirectlyinagraduatedcylinder.Liquidquantitiesdealtwithinthelaboratoryareusuallyexpressedinmilliliters(mL),althoughlargervolumesareexpressedinlit
3、ers(L).Volumesofregularlyshapedgeometricsolidscanbecalculatedfromdirectmeasurementsoftheirdimensions.Forexample,thevolumeofarectangularsolidiscalculatedbymultiplyingitslength,widthandheight(V=lxwxh).Volumesofsolidsareusuallyexpressedincubiccentimeters(cm3).Manysolidsdonotlend
4、themselvestodirectmeasurementoftheirdimensions.Theseincludeirregularlyshapedobjects,suchasrocks,andregularlyshapedobjectsthataretoosmalltobemeasuredwithaccuracy.Volumesofsuchsolidsaremeasuredbywaterdisplacement.Ifasolidistotallyimmersedinaliquid,suchaswater,thesolidwillpushas
5、ideordisplace,avolumeofwaterequaltoitsownvolume.Thus,eachmilliliterofwaterdisplacedbyasolidrepresentsonecubiccentimeterofsolidvolume.Densityisanimportantpropertyofmatter.Byitself,orinconjunctionwithotherproperties,densitycanbeusedtoidentifysubstances.Densityisdefinedasthequan
6、tityofmatterinagivenunitofvolume.Thisrelationship,expressedmathematically,isDensity=MassVolumeYouwillbeexpectedtousethemeasuringskillsandtechniquesdevelopedinearlierlaboratorysessionsandinthefirstpartofthisexperimenttofindthemassandvolumeofdifferentsubstances.Youwillusethisda
7、tatocalculatethedensitiesofthesesubstancesbyalgebraicandgraphicalmeans.PurposeLearnandpracticetechniquesandcalculationsfordeterminingvolumeanddensityofasubstance.EquipmentLabbalanceGraduatedcylinders,100mLand10mLBeaker,250mLMetricRulerRegular-shapedobject(block)Irregular-shap
8、edobject(pipe)TI-83+calculatorMaterialsTapwaterUnknownliquidAorBProc
