英语化学考题及对应答案分享

英语化学考题及对应答案分享考试时间：______分钟总分：______分姓名：______1.The______ofachemicalreactionreferstothesubstancesthatarechangedintonewproducts.A.reactantsB.productsC.catalystsD.solvents2.Intheexperiment,theliquid______(evaporate)slowlywhenheatedto50°C.3.Whichtermdescribesasubstancethatspeedsupachemicalreactionwithoutbeingconsumed?A.inhibitorB.reactantC.catalystD.solvent4.Thetesttube______(place)inthewaterbathfor10minutestomaintainconstanttemperature.5.Whenanacidandabasereact,theyform______andwater.A.saltB.gasC.metalD.acid6.Thescientist______(conduct)theexperimentthreetimestoensureaccuracy.7.Whichofthefollowingareexamplesofphysicalchanges?(Selectallthatapply)A.BurningwoodB.MeltingiceC.DissolvingsaltinwaterD.Rustingiron8.Themixture______(stir)continuouslyuntilthesolidcompletelydissolved.9.Whatisthechemicalsymbolforsodium?A.SoB.NaC.SdD.Nd10.Thereaction______(occur)immediatelyafterthetwosolutionsweremixed.Readthefollowingtextandanswerthequestionsthatfollow.Text1:Titrationisatechniqueusedtodeterminetheconcentrationofanunknownsolution.Inthismethod,asolutionofknownconcentration(titrant)isaddedtotheunknownsolutionuntilthereactionreachesitsequivalencepoint.Forexample,tofindtheconcentrationofhydrochloricacid(HCl),asodiumhydroxide(NaOH)solutionofknownmolarityisused.ThevolumeofNaOHrequiredtoneutralizetheHClismeasured,andtheconcentrationofHCliscalculatedusingtheformula:M1V1=M2V2,whereM1andV1arethemolarityandvolumeofHCl,andM2andV2arethoseofNaOH.11.Whatisthepurposeofaddingthetitranttotheunknownsolution?A.ToincreasethetemperatureofthereactionB.TodeterminetheconcentrationoftheunknownsolutionC.ToproduceagasasabyproductD.Tochangethecolorofthesolutionpermanently12.If25.0mLof0.2MNaOHisusedtoneutralize30.0mLofHCl,whatistheconcentrationofHCl?(UsetheformulaM1V1=M2V2)A.0.15MB.0.20MC.0.25MD.0.30M13.Whathappensattheequivalencepointinatitration?A.ThesolutionturnsblueB.ThereactionstopsabruptlyC.ThereactantsarecompletelyneutralizedD.AprecipitateformsReadthefollowingtextandanswerthequestionsthatfollow.Text2:Catalystsplayacrucialroleinindustrialchemicalprocessesbyloweringtheactivationenergyrequiredforreactions.Forinstance,platinumisusedasacatalystintheproductionofnitricacidfromammoniaandoxygen.Withoutthecatalyst,thereactionwouldrequireextremelyhightemperaturesandpressures,makingitinefficient.However,withplatinum,thereactionproceedsrapidlyundermilderconditions.Importantly,catalystsarenotconsumedinthereactionandcanbereusedmultipletimes.14.Whyisplatinumusedintheproductionofnitricacid?A.ToincreasetheyieldofnitricacidB.TolowertheactivationenergyandallowmilderconditionsC.TopreventtheformationofbyproductsD.Tochangethecoloroftheproduct15.Whathappenstoacatalystduringachemicalreaction?A.ItisconvertedintoanewsubstanceB.ItisconsumedandcannotbereusedC.ItremainsunchangedandcanbereusedD.Itincreasestheactivationenergy16.Whatwouldhappenifacatalystwerenotusedintheproductionofnitricacid?A.ThereactionwouldoccurfasterB.ThereactionwouldrequirehighertemperaturesandpressuresC.TheproductwouldbeimpureD.Noreactionwouldoccur17.TranslatethefollowingsentenceintoChinese:"Thesolubilityofasolidinaliquidincreaseswithtemperature."18.TranslatethefollowingsentenceintoEnglish:"金属与酸反应会产生氢气。"19.Writeashortreport(about150words)ontheexperiment"PreparationofSoap".Includethefollowingpoints:objective,keysteps,andresult.试卷答案1.答案A,解析思路:reactants指反应物，是反应中被消耗的物质，而products是产物，catalysts是催化剂，solvents是溶剂，符合定义。2.答案evaporates,解析思路:一般现在时，主语liquid是单数，所以用第三人称单数形式evaporates，表示液体在加热时缓慢蒸发。3.答案C,解析思路:catalyst是催化剂，能加速反应而不被消耗，inhibitor是抑制剂，reactant是反应物，solvent是溶剂，符合描述。4.答案wasplaced,解析思路:一般过去时的被动语态，表示测试管被放置在水浴中，主语testtube是单数，过去被动形式wasplaced。5.答案A,解析思路:酸碱中和反应生成盐和水，gas是气体，metal是金属，acid是酸，符合化学常识。6.答案conducted,解析思路:一般过去时，主语scientist是单数，表示科学家在过去进行了实验，conducted是conduct的过去式。7.答案B,C,解析思路:物理变化包括熔化冰（状态变化）和溶解盐（溶解过程），燃烧wood和生锈iron是化学变化，涉及新物质生成。8.答案wasstirred,解析思路:一般过去时的被动语态，表示混合物被搅拌，主语mixture是单数，过去被动形式wasstirred。9.答案B,解析思路:钠的化学符号是Na，So是错误符号，Sd和Nd不存在，符合元素周期表。10.答案occurred,解析思路:一般过去时，表示反应在过去发生，主语reaction是单数，occurred是occur的过去式。11.答案B,解析思路:文本第一句明确说determinetheconcentrationoftheunknownsolution，其他选项如增加温度、产生气体或永久改变颜色未提及。12.答案A,解析思路:用公式M1V1=M2V2，代入M2=0.2M,V2=25.0mL,V1=30.0mL，计算M1=(M2V2)/V1=(0.2*25)/30=0.15M。13.答案C,解析思路:文本中说equivalencepoint时反应完全neutralized，其他选项如溶液变蓝、反应停止或沉淀形成未提及。14.答案B,解析思路:文本中说platinumlowerstheactivationenergyandallowsmilderconditions，其他选项如增加产量、防止副产物或改变颜色未提及。15.答案C,解析思路:文本最后一句说catalystsarenotconsumedandcanbereused，其他选项如转化为新物质、被消耗或增加活化能错误。16.答案B,解析思路:文本中说withoutcatalyst,reactionrequiresextremelyhightemperaturesandpressures，其他选项如反应更快、产品不纯或无反应未提及。17.答案:固体的溶解度随温度升高而增加。解析思路:直译，关键词solubility（溶解度）、solid（固体）、liquid（液体）、increaseswithtemperature（随温度升高而增加）。18.答案:Metalsreact