外研版高中英语课文文本 必修一 Module 5 Reading

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1、PassageAItishardtothinkofaworldwithoutmetals.Differentmetalshavedifferentuses,forexample,steelisusedincars,andironisusedinelectricalequipment.Whenweusemetals,itisimportanttoknowhowtheyreactwithdifferentsubstances,forexample,waterandoxygen.Thereactionofm

2、etalswiththesesubstancescanbeputinorder.Hereisatablewiththemetalsthatreactmostatthetop,andthemetalsthatreactleastatthebottom.MetalHeatedinoxygenReactionwithwaterorsteamPotassiumBurnstoformanoxide*ReactingwithcoldwaterSodiumCalciumMagnesiumReactingwithst

3、eamAluminiumZincIronReactsslowlyPartialreactionCopperPartialreactionNoreaction*anoxide=anothersubstance+oxygenPassageBASimpleScientificExperimentBelowisadescriptionofasimplescientificexperiment.Itshowsushowironreactswithairandwithwater.Aim:Tofindoutifir

4、onrusts(a)indryair;(b)inwaterthathasnoairinit(air-freewater);(c)inordinarywater.Apparatus:3cleanironnails;testtubes;testtubeholder;cottonwool;oil;Bunsenburner.IronindryairMethod1.Putsomeironnailsatthebottomofatesttube.2.Pushsomecottonwooldownthetube.3.L

5、eavethetubeforoneweek.ResultAfteroneweek,thenailshavenotrusted.ConclusionIrondoesnotrustindryair.Ironinair-freewaterMethod1.Half-fillatesttubewithwater.2.Boilthewaterforthreeminutes.(Thismakessurethereisnoairinthewater.)3.Puttwoorthreecleannailsinthewat

6、er.4.Addsomeoiltothewater.Thiswillkeepairoutofthewater.5.Leavethetubeforoneweek.ResultThenailsdonotrustinthetubewithair-freewater.ConclusionIrondoesnotrustinair-freewater.IroninordinarywaterMethod1.Half-fillatesttubewithwaterandaddtwoorthreecleannails.2

7、.Leavethetubeforoneweek.ResultThenailsrustinthetubewithordinarywater.ConclusionIronrustsinordinarywater.