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1、Unit1TheRootsofChemistryI.Comprehension.1.C2.B3.D4.C5.BII.Makeasentenceoutofeachitembyrearrangingthewordsinbrackets.1.Thepurificationofanorganiccompoundisusuallyamatterofconsiderabledifficulty,anditisnecessarytoemployvariousmethodsforthispurpose.2.Scienceisanever-in
2、creasingbodyofaccumulatedandsystematizedknowledgeandisalsoanactivitybywhichknowledgeisgenerated.3.Life,afterall,isonlychemistry,infact,asmallexampleofchemistryobservedonasinglemundaneplanet.4.Peoplearemadeofmolecules;someofthemoleculesinpeoplearerathersimplewhereaso
3、thersarehighlycomplex.5.Chemistryiseverpresentinourlivesfrombirthtodeathbecausewithoutchemistrythereisneitherlifenordeath.6.Mathematicsappearstobealmostashumankindandalsopermeatesallaspectsofhumanlife,althoughmanyofusarenotfullyawareofthis.III.Translation.1.(a)chemi
4、calprocess(b)naturalscience(c)thetechniqueofdistillation2.Itistheatomsthatmakeupiron,water,oxygenandthelike/andsoon/andsoforth/andotherwise.3.Chemistryhasaverylonghistory,infact,humanactivityinchemistrygoesbacktoprerecordedtimes/predatingrecordedtimes.4.Accordingto/
5、Fromtheevaporationofwater,peopleknow/realizedthatliquidscanturn/be/changeintogasesundercertainconditions/circumstance/environment.5.Youmustknowthepropertiesofthematerialbeforeyouuseit.IV.Translation化学是三种基础自然科学之一，另外两种是物理和生物。自从宇宙大爆炸以来，化学过程持续进行，甚至地球上生命的出现可能也是化学过程的结果。人们
6、也许认为生命是三步进化的最终结果,第一步非常快,其余两步相当慢。这三步是：（I）物理进化（化学元素的产生），（II）化学进化（分子和生物分子的形成）；和（III）生物进化（有机物的形成和发展）。V.Solution:（1）Therelativemassof1Hand12Catomscanbecalculatedfromtheirabsolutemassesingrams.Ifthemassofa12Catomisexactly12amu,thenthemassofa1Hatomtofivesignificantfiguresm
7、ustbe1.0078amu.12amux0.083986=1.0078amu（2）Firstwecalculatekandthenusethefirst-orderrateequation.Thebonewastossedaway(moreprecisely,theanimalwhosebonewasdied)about6100yearsago,orabout4100B.C.Wecanthusbesurethatavillagewasinexistenceatthatplaceatthattime.Unit7TheNomen
8、clatureofInorganicSubstancesI.Comprehension1.A2.B3.C4.C5.BII.Givethesystematicnameforthefollowingammoniumion;copper(II)ion;strontiumion;Cc
