单质和化合物-Elements-and-Compounds.ppt

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1、ElementsandCompoundsObjectives◗Distinguishbetweenelements单质andcompounds化合物.◗Describetheorganizationofelementsintheperiodictable元素周期表.◗Explainthelawsofdefinite定比定律andmultipleproportions倍比定律element:单质,元素Choosethemixtureashomogeneous.a.brass(analloyofzincandcopper)b.muddywaterc.bloodd.powdereddri

2、nkmixdissolvedinwaterExercises:Classification:solutionCanyouseeindividualhydrogenandoxygeninthewater?Whatiselementandcompound?UrBr2CuAnelementisapuresubstancethatcannotbeseparatedintosimplersubstancesbyphysicalorchemicalmeans.Element单质Groupdiscussion:Canyougivesomeelementsasmanyasyoucan?(InEng

3、lish)CuHgHe/consistingofasingletypeofatomPeriodicTableWhowasthefirsttoinventthemodernperiodictable?Mendeleevbasedonthesimilaritiesandmassesoftheelementsperiod周期group族Compound化合物What’sthesimilaritiesbetweenwaterandcarbondioxideCO2?ConsistoftwokindsofelementsPuresubstance,consistofoxygenmadeupof

4、twoormoredifferentelementsthatarecombinedchemicallyHowcanyouprovesaltismadeupoftwoelements?Canyoutaste3things?NaCl2Howcanyouprovewaterismadeupoftwoelements?Theexperiment?Anelectriccurrentbreaksdownwaterintoitscomponents,oxygenandhydrogen.electrolysis电解Summarize:Classifythefollowingmattersinto（

5、mixture、puresubstance、element、compound）：Choosethecompoundsfromfollowingsubstances()tablesalt,water,alcohol,sucrose,sulfuricacid,bakingsoda，carbondioxide,oxygen,helium食盐酒精蔗糖LawofconservationofmassMassisneithercreatednordestroyedduringachemicalreaction—itisconserved保存的质量守恒定律What’sthechangeofiron

6、?Ifthemassofreactantsequalproducts?massreactants=massproductsA13.0-gsampleofXcombineswitha34.0-gsampleofYtoformthecompoundXY2.Whatisthemassofthereactants?Let’stry:反应物生成物P9:502.If14.0gofN2gasreactswithexcessofhydrogengas,What’sthemassofNH3formed?History:AntoineLavoisiermercury(II)oxideUsethedat

7、ainthetabletoanswerthefollowingquestions.