catalyst - libero：催化剂-自由

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1、ExperimentguideaudioCatalystsObjective:toinvestigatetheroleofcatalysts.Equipment:·Hydrogenperoxide(H2O2)3%·manganese(IV)oxide(MnO2)·achunkofpotato·testtubes·pipettes·spatulaCautionGlovesandgogglesmustbewornProcedure:followthestepsanddotheexercises1-Pourhydrogenperoxideintoalarge

2、testtubeThesolutionis:ðcolourlessðcolouredðwithfewbubblesðwithmanybubbles2-Nowaddasmallquantityofmanganese(IV)oxide(MnO2):Thesolutionis:ðcolourlessðcolouredðwithfewerbubblesðwithmorebubbles3-Repeattheexperimentaddingachunkofpotatotothehydrogenperoxide:Thesolutionis:ðcolourlessðc

3、olouredðwithfewerbubblesðwithmorebubbles4-Manganese(IV)oxide(MnO2)isan:ðinorganiccompoundðorganiccompound5-Thepotatoisan:ðinorganiccompoundðorganiccompound6-Thereactionthatoccursis:2H2O2®2H2O+O2Whichisthereactant?name_______________formula_________Whicharetheproducts?a-name_____

4、_______formula__________b-name____________formula__________7-Inthefirststepoxygenisproduced:ðrapidlyðslowlyðnoneofthem8-Inthesecondandinthethirdstepoxygenisproduced:ðrapidlyðslowlyðnoneofthetwo9-Whydoesn’tmanganese(IV)oxideappearinthereactionatstep6?ðItwasconsumedðItwasproducedð

5、Itischemicallyunchanged10-Canyouusemanganese(IV)oxideagain?ðYesðNo12-Manganese(IV)oxide:ðspeedsupthereactionðslowsdownthereactionðnoneofthetwo13-Thepotatochunk:ðspeedsupthereactionðslowsdownthereactionðnoneofthetwoGuidedreportTheexperimentinvolvesthebreakingdown_________________

6、__whichgiveswaterandoxygen.Byaddingeitheralittlemanganese(IV)oxide(MnO2)orapotatochunktherateofreaction__________.Thesesubstancesarecatalysts.Manganeseoxideisan___________compound,thepotatochunkcontainsanorganic_________,anenzymecalledcatalase.Acatalystisa_________whichspeedsupa

7、chemicalreaction.Attheendofthereactionthe___________ischemicallyunchanged.Catalystsareoftentransition_________ortransitioncompounds,likemanganeseoxide.Enzymesarebiologicalcatalystsandcatalysespecific________.Theyaremainlymadeupofproteins.Forexamplehydrogenperoxideisdecomposedint

8、owaterand_________byanenzyme(catalase)presentin