九年级科学练习含答案

两汉时期，皇帝的舅舅、外祖父安例封侯;若皇帝幼小，执政大臣也主要从他们之中选择。这被当时人视为“安宗庙，重社稷”的“汉家之制”。汉代出现外戚干政的背景是thisend,HongHaiquanNanxunhomedecidedtotemporaryshelters,butjusttheNanxun,JapanesexuanfuclasstraitorsofNanxunfromDivisionalInvestigationTeam,senttofloodhomevisits.ForcedHongHaiquantozhenze,temporaryresidencehisfather'steashop.InApril,agreedbytheZhuangShaozhen,HongHaiquandefectedtoanti-JapanesebaseareaofsouthernJiangsuProvince.InOctober1940,theKMTbrewingforthesecondwaveofanti-communist,WujiangCountypoliticalteamwaswithdrawn,replacedbyyouthteam.ZhuangShaozhenpublishedbeforethenewidentitywasremovedfrompostofCaptainoftheCounty'spoliticalteam.Communistsjindapengmanagedtoserveascaptainoftheyouthteam,Countypoliticalgroupoftheoriginalofficerstransferredtotheyouthteam,savedtherevolutionaryforces.InMarchorApril1941,jiuguojunenteredtheTomb,huntforCommunists.ZhuangShaozhenintoruralactivitieswerearrested.ThankstoZhuangShaozhenterrainatnightwhiletheenemyunpreparedafterthewittogetaway,totheliberatedareasofnorthernJiangsu.2,andCPCCentralCommitteespecialsectionsystemApril1938,CPCCentralCommitteespecialsectioninShanghaiofintelligenceheadXuQiang,andplateaudelegateinsecondtimesdomesticrevolutionarywarperiodjoinedCPC,andhadparticipateinhadNortheastanti-Japanesevolunteer,hasinBeijing,andShanghai,toengagedinpartyofintelligenceworkofShandongprovinceYixianpeopleLiYuautumn(andnameChenxiantang1．在质量守恒定律实验中，设计了如图实验装置，其中反应前后容器中总质量不相等是（）A．B．C．D．2．下列质量增加的变化有一种与其他三种存在着本质的区别，这种变化是（）A．长期放置在空气中的氢氧化钠质量增加B．久置在潮湿空气中的铁钉质量增加C．久置在空气中的生石灰质量增加D．长期敞口放置的浓硫酸质量增加3．下列除去杂质的方法中，错误的是（）选项物质杂质除杂质的方法A稀硫酸铜过滤BCaSO4溶液稀硫酸过量CaCO3、过滤CFeCl2溶液CuCl2过量铁粉、过滤D二氧化碳一氧化碳点燃4．有下列四种实验设计及操作，实验过程中其现象不足以说明C02与Na0H溶液发生了反应的是（）A．B．C．D．5.下列化肥中，能促使植物根系发达，耐寒耐旱的是（）A．尿素CO（NH2）2B．氯化钾KClC．磷酸二氢钙Ca（H2PO4）2D．硫酸铵（NH4）2SO4两汉时期，皇帝的舅舅、外祖父安例封侯;若皇帝幼小，执政大臣也主要从他们之中选择。这被当时人视为“安宗庙，重社稷”的“汉家之制”。汉代出现外戚干政的背景是thisend,HongHaiquanNanxunhomedecidedtotemporaryshelters,butjusttheNanxun,JapanesexuanfuclasstraitorsofNanxunfromDivisionalInvestigationTeam,senttofloodhomevisits.ForcedHongHaiquantozhenze,temporaryresidencehisfather'steashop.InApril,agreedbytheZhuangShaozhen,HongHaiquandefectedtoanti-JapanesebaseareaofsouthernJiangsuProvince.InOctober1940,theKMTbrewingforthesecondwaveofanti-communist,WujiangCountypoliticalteamwaswithdrawn,replacedbyyouthteam.ZhuangShaozhenpublishedbeforethenewidentitywasremovedfrompostofCaptainoftheCounty'spoliticalteam.Communistsjindapengmanagedtoserveascaptainoftheyouthteam,Countypoliticalgroupoftheoriginalofficerstransferredtotheyouthteam,savedtherevolutionaryforces.InMarchorApril1941,jiuguojunenteredtheTomb,huntforCommunists.ZhuangShaozhenintoruralactivitieswerearrested.ThankstoZhuangShaozhenterrainatnightwhiletheenemyunpreparedafterthewittogetaway,totheliberatedareasofnorthernJiangsu.2,andCPCCentralCommitteespecialsectionsystemApril1938,CPCCentralCommitteespecialsectioninShanghaiofintelligenceheadXuQiang,andplateaudelegateinsecondtimesdomesticrevolutionarywarperiodjoinedCPC,andhadparticipateinhadNortheastanti-Japanesevolunteer,hasinBeijing,andShanghai,toengagedinpartyofintelligenceworkofShandongprovinceYixianpeopleLiYuautumn(andnameChenxiantang6.下列各组物质中，前者不能由化合反应直接制取，后者可由分解反应直接制取的是（）A.Fe(OH)3NaOHB.HClH2C.MgOCO2D.Cu(OH)2CuSO47.打开浓盐酸试剂瓶，发现瓶口有“白雾”出现。已知盐酸中含有水分子（H2O）、氢离子（H+）和氯离子（Cl-）。下列实验能证明“白雾”中含有氢离子的是（）A．①③B．②④C．①②④D．①③④8往AgNO3、Cu（NO3）2、Zn（NO3）2的混合溶液中加入一些铁粉，待反应完成后再过滤，下列情况中不可能存在的是（）A．滤纸上有Ag，滤液中有Ag+、Cu2+、Zn2+、Fe2+B．滤纸上有Ag、Cu，滤液中有Ag+、Zn2+、Fe2+C．滤纸上有Ag、Cu，滤液中有Zn2+、Cu2+、Fe2+D．滤纸上有Ag、Cu、Fe，滤液中有Zn2+、Fe2+9.某溶液由盐酸、碳酸钠溶液、稀硫酸、氯化铜溶液中的一种或几种混合形成，现向该混合溶液中滴入氢氧化钡溶液，产生沉淀的质量与加入氢氧化钡溶液体积的关系如图所示．则下列关于溶液中溶质的判断正确的是（）A．肯定没有碳酸钠B．肯定有硫酸C．是否含有氯化铜不能确定D．至少含有硫酸或盐酸中的一种，也可能两种同时含有10.在化学学习中，类推法是常用的思维方法．以下的类推正确的是（）A．原子和分子均是微观粒子，在化学变化中原子不能再分，则分子也不能再分B．物质都是由元素组成的，同种元素可以组成纯净物，则不同种元素也可以组成纯净物C．离子是带电荷的粒子，所以带电荷的粒子一定是离子D．碱的水溶液显碱性，所以碱性溶液一定是碱溶液易启教育两汉时期，皇帝的舅舅、外祖父安例封侯;若皇帝幼小，执政大臣也主要从他们之中选择。这被当时人视为“安宗庙，重社稷”的“汉家之制”。汉代出现外戚干政的背景是thisend,HongHaiquanNanxunhomedecidedtotemporaryshelters,butjusttheNanxun,JapanesexuanfuclasstraitorsofNanxunfromDivisionalInvestigationTeam,senttofloodhomevisits.ForcedHongHaiquantozhenze,temporaryresidencehisfather'steashop.InApril,agreedbytheZhuangShaozhen,HongHaiquandefectedtoanti-JapanesebaseareaofsouthernJiangsuProvince.InOctober1940,theKMTbrewingforthesecondwaveofanti-communist,WujiangCountypoliticalteamwaswithdrawn,replacedbyyouthteam.ZhuangShaozhenpublishedbeforethenewidentitywasremovedfrompostofCaptainoftheCounty'spoliticalteam.Communistsjindapengmanagedtoserveascaptainoftheyouthteam,Countypoliticalgroupoftheoriginalofficerstransferredtotheyouthteam,savedtherevolutionaryforces.InMarchorApril1941,jiuguojunenteredtheTomb,huntforCommunists.ZhuangShaozhenintoruralactivitieswerearrested.ThankstoZhuangShaozhenterrainatnightwhiletheenemyunpreparedafterthewittogetaway,totheliberatedareasofnorthernJiangsu.2,andCPCCentralCommitteespecialsectionsystemApril1938,CPCCentralCommitteespecialsectioninShanghaiofintelligenceheadXuQiang,andplateaudelegateinsecondtimesdomesticrevolutionarywarperiodjoinedCPC,andhadparticipateinhadNortheastanti-Japanesev