2021届中考化学抢分猜题卷 河南地区专用
※题型：单选题※知识点：单选题※试题难度：较易<br>河南是农业大省。下列粮食作物的种子富含蛋白质的是( )<br>A.大豆 B.小米 C.大米 D.小麦<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/29a1a4ce65f7498b86ece139a092e4f0/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/a4a0c604cb8346d99064c414552a34c5/727110B8F4DD9B1FDACB2B7B57206F05.png"><br><br>※题型：单选题※知识点：单选题※试题难度：容易<br>红旗渠被称为“人工天河”。在修渠过程中的下列做法不包含化学变化的是( )<br>A.炸药爆破 B.烧制石灰 C.锤凿岩石 D.烧火做饭<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/51a49625bcae4aedb54bcfb338d20dfb/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/1f28e7a02242415d9ad37f3cb8cdaf7d/58F652714A1725C7A81D2E2A80993C7C.png"><br><br>※题型：单选题※知识点：单选题※试题难度：容易<br>垃圾分类处理有利于生态文明建设。废弃物中易拉罐属于( )<br>A.可回收物 B.厨余垃圾 C.有害垃圾 D.其他垃圾<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/91d489e659d64000b7cfcde3f49ba2aa/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/dd879e7b45994a138beb5c974799327b/FDE4C3ABE442A7CB3E095B1D88BBFC50.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>下列物质由离子构成的是( )<br>A.氢气 B.氯化钾 C.金刚石 D.二氧化碳<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2020/7198152908d04d76861f1b905b9c3142/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br>略<br>※题型：单选题※知识点：单选题※试题难度：较易<br>2020年3月22日至28日为“中国水周”。下列有关水的说法正确的是( )<br>A.活性炭能使海水转化为淡水<br>B.硬水和软水可用食盐水来区分<br>C.过滤可以除去水中的可溶性杂质<br>D.酸和碱的中和反应一定有水生成<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/9a8aa130016841edac25365a9adaa772/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/eb8add17bfb240e999201a19c4f33d91/78F3B0C55F70AE38BB53848750099B0C.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>铜可用于制造传统的炭火锅,下列性质与此用途无关的是( )<img src="https://picture2.zhihuicn.com/testImage/2/2019/10/30/1A89E4D0958EEFB873E10D2AF7E8D162.png"><br>A.熔点高 B.导热性好 C.延展性好 D.导电性好<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2019/38695957ca7c4521a1d7aba6e4f7d84a/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2019/cccfe2ec029346a49d76145fa6ae319f/68354DEBE891ADF38F69012E5A05E451.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>下列图示的实验操作正确的是( )<br>A.取用块状固体<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/1/9E6AC471E17B940F1B0D7E5A4C0791C4.png"><br>B.倾倒液体<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/1/2AA7E55792695FE90E61518A78A85C92.png"><br>C.测溶液的pH<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/1/5E236A00EA1C2C7B7BD24DD3ACDC32F0.png"><br>D.稀释浓硫酸<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/1/558330E931D145D541B8CCF480068AED.png"><br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/c276ddec1edd4c778678b31e7d4c9a4f/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/ae0ce26eb2594066aff4e1cb29614f27/6ED2ABD926F602FF173BED3740950BF7.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>碳酸乙烯酯(<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/1/0C7F68141873AE0625967D1835C7E3D3.png"><br>)可用作锂电池电解液。下列有关碳酸乙烯酯的说法正确的是( )<br>A.相对分子质量为88g<br>B.其中C、H、O三种元素的质量比为12:1:16<br>C.其中碳元素的质量分数最大<br>D.其分子中C、H、O三种原子的个数比为3:4:3<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/9d55b6d2c5eb4694a9ba5a4c661f31e0/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/30afb71e493648dda74254aae806ab46/867D11111166F931D2F3135E29D5AD14.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>如图是<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/21/490D2448912FDAA82DEDD28BCF750A33.png"><br>和<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/21/1B0D100CD07DE02C2FD1479964DC1EEE.png"><br>的溶解度曲线。下列叙述错误的是( )<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/21/D7F664BD6DFBF69225CBE927CE03BCFF.png"><br>A.<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/21/FCCD9596601883BB3311EAC823C6623F.png"><br>℃时,<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/21/490D2448912FDAA82DEDD28BCF750A33.png"><br>的溶解度与<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/21/1B0D100CD07DE02C2FD1479964DC1EEE.png"><br>的溶解度相等<br>B.<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/21/987E7EF0931F8B5597DE88936DA9F6B2.png"><br>℃时,<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/21/490D2448912FDAA82DEDD28BCF750A33.png"><br>饱和溶液中溶质的质量分数是37.5%<br>C.<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/21/FCCD9596601883BB3311EAC823C6623F.png"><br>℃时,<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/21/1B0D100CD07DE02C2FD1479964DC1EEE.png"><br>的不饱和溶液降温,肯定无晶体析出<br>D.<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/21/987E7EF0931F8B5597DE88936DA9F6B2.png"><br>℃时,<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/21/490D2448912FDAA82DEDD28BCF750A33.png"><br>饱和溶液中溶质的质量分数大于<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/21/1B0D100CD07DE02C2FD1479964DC1EEE.png"><br>饱和溶液中溶质的质量分数<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/674c7584b47f493498d1d4775842b7c1/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br>略<br>※题型：单选题※知识点：单选题※试题难度：较易<br>“84”消毒液是抗击“新型冠状病毒肺炎”疫情期间常用的消毒剂,其主要成分次氯酸钠(NaClO)可用如下反应制取:<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/6/329575FD888E5FC6FC2BF364EC3721BD.png"><br>。则<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/6/93A19C6BBAAC4C42F35EECD724B1E7B2.png"><br>通入石灰水中的生成物可能为( )<br>A.<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/6/65DFF2BE0FBCD241248096515C71A583.png"><br>B.<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/6/1D1B12689E8617399A7C6FC1092FF6BF.png"><br>C.<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/6/76F7FBF2EDE5DB5B1D8CAB2BE04F1FCC.png"><br>D.<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/6/46D00EEF4666B3C2953543EC76EB4922.png"><br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/36f21c9b4a5441f3a81ac1f0592949db/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/821a99339d674d2999bcce325ef34110/8C1BA955A1182A9C77B64BB29608690B.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>分类法是化学学习的重要方法。下列关于物质分类正确的是( )<br>A.酸:硫酸铜、盐酸、硫酸<br>B.氧化物:水、生石灰、二氧化碳<br>C.碱:纯碱、烧碱、熟石灰<br>D.有机物:甲烷、乙醇、碳酸氢铵<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/b4a8c3a9f3f0468db534e2a8f735ea15/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/7dc270965b814a5fa502847acb57d856/7D89F2611E8F0599A91F122D7F310AE6.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>工业上常将煤洗选加工后用于制备水煤气,其主要反应的微观示意图如下。下列有关说法不正确的是( )<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/1/D17DCB45DDDCF428FE92C119A8F9DA7D.png"><br>A.A和B的质量比为3:2 B.该反应属于置换反应<br>C.C物质是一种有毒气体 D.D物质属于清洁燃料<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/dfdee5833ff54fd381d1a18ba6587ea7/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/b5173c1495e2428091dd8eb81cf3cc91/0F0546391A8DEC1E3E4FA4CEC7F98455.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>向MgO和CuO的混合物12g中加入稀硫酸至恰好溶解,再向所得溶液中加入NaOH溶液至恰好沉淀完全,生成<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/6/860E0DE1FD8107FBFA0AFA7E46C0BFDB.png"><br>和<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/6/F5F71A8AD51C24056ED8049CB19FE878.png"><br>沉淀的总质量为15.6g,则参加反应的NaOH的质量为( )<br>A.18.0g B.16.0g C.8.0g D.3.6g<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/40c20741a17744d78a0805d9fc1bdb8d/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/2c6f6ac47b7f41dbb0abcfbcab0431c3/B99B2429D2C2CB34AAE50D93DFDA9B39.png"><br><br>※题型：填空题※知识点：填空题※试题难度：较易<br>现有氮气、氧气、氯气等物质,请用化学式填空:可做食品防腐剂的是<br>_<br>__________<br>;用于自来水杀菌消毒的是<br>_<br>__________<br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/57d73abb10574e399a88a6ba72b6231b/015987EF4F41DADD9CFBFB643F17A555.png"><br>解析<br>略<br>※题型：填空题※知识点：填空题※试题难度：容易<br>硒元素有防癌抗癌的作用,硒原子的结构示意图及硒元素在元素周期表中的信息如图所示。则<br><br>x<br>的数值为_____________;硒的相对原子质量为_____________。<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/6/CD8CC3AF6282FD3374B6EBAE25D66FF6.png"><br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/05206b0f3931458785f5ad8ae6cea335/299BE620BBBAB8EE2821D375FCEDE1B5.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/0c64a2f39eb1479f9741a255af1f8b65/7C7E3DF92A411AE3DD1F1B16A9F7ECB0.png"><br><br>※题型：问答题※知识点：问答题※试题难度：较易<br>量筒和托盘天平是初中化学实验室非常常用的两种称量仪器,正确地使用它们才能严格按照实验规定的用量取用药品。完成下列有关量筒使用过程的填空。<br>1.正确量取15mL液体,应选用下列(填序号)量筒;①20mL ②50mL ③10mL和5mL ④10mL2.某同学量取食盐水,读数时量筒放平在桌上且面对刻度线,当视线俯视时读数为38mL,其正确的体积数应(填“大于”小于”或“等于”)38mL。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2020/61fb534e33144f58afb76e8a296ccc23/D66C4FD6C116382CA2076B8C4C427FE1.png"><br>解析<br>略<br>※题型：实验题※知识点：实验题※试题难度：中等<br>下图装置可以做<br>CO<br>还原<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/6/44F64D7E65F3BED942A6236E4D8161BF.png"><br>的实验并检验该反应的气体生成物。已知由一氧化碳发生装置得到的<br>CO<br>中混有杂质<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/6/7002435560602C62060BA723DC55D86C.png"><br>和<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/6/AA5DD1505F1D7A06A012CABC988FF45C.png"><br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/6/150E1362F288A6E04201B1D14A4AB4C1.png"><br>1.B装置中应盛放的试剂是_____________。<br>2.写出C装置玻璃管内发生反应的化学方程式:_____________。<br>3.从环保角度考虑,请写出一种尾气处理的方法:_____________。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/ef55036b35034894891d14c1d92ef166/B475D16B60BC467FE4AD385EABB01763.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/f09a1002be2c412d9c1b0c0c34b29a8d/A63D24D80DE47C22740B4138DF062687.png"><br><br>※题型：填空题※知识点：填空题※试题难度：中等<br>一定质量的乙烯<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/28/79763197AAB3D32A26B146BF69EF7A91.png"><br>燃烧后生成<br>4.4g<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/28/7002435560602C62060BA723DC55D86C.png"><br>、<br>1.4gCO<br>,则同时生成<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/28/AA5DD1505F1D7A06A012CABC988FF45C.png"><br>的质量为<br>_<br>_________<br>g<br>,参加反应的氧气的质量为<br>_<br>_________<br>g<br>,该反应的化学方程式为<br>_<br>_________<br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/5ee7e1eb6fdb40cbb07c569ff07c097a/1702ACD6451B41148538651B665F0ED3.png"><br>解析<br>略<br>※题型：推断题※知识点：推断题※试题难度：中等<br>A<br>、<br>B<br>、<br>C<br>为初中化学常见的三种物质,它们之间有如图所示的转化关系(“→”表示某一种物质经步反应可转化为另一种物质,部分反应物、生成物及反应条件均已略去)。<br><img src="https://picture2.zhihuicn.com/testImage/2/2020/7/23/C14BE5CAFD64D9CC2E89B9DD740F7280.png"><br>1.若B为紫红色金属,C为黑色固体,则B为;A所属的类别为(填“酸”“碱”或“盐”)。<br>2.若B是由三种元素组成的盐,C广泛用于制取肥皂,以及石油、印染等工业,在生活中可用来去除油污,则C→A的反应__________(填“一定”或“不一定”)属于复分解反应,B→A反应的化学方程式为__________(任写一个)。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2020/98a3cb3b5e864693bceaa71841498c28/04FEE520CEEF6CBE5530FDB623D075CE.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2020/0b691e139db24827a491eeab4f0c8a4d/6F3E02207D04631E3BBCBB730BC6B1BD.png"><br><br>※题型：问答题※知识点：问答题※试题难度：中等<br>康<br>康<br>将未打磨的铝片和稀盐酸放入密闭容器中,用传感器探究反应过程中温度和压强的变化,变化情况如下图。<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/1/547676DF1DE6DD8199686C7ECFC49FD3.png"><br>1.写出0~50s发生反应的化学方程式。<br>2.?请综合分析60~90s压强逐渐增大的原因。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/a69f4e2b50ed4189adae518bf898a247/1C6E3A97E7F74183B36DF6F7498E9851.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/2b214c047722449295f3c5c3f5de4927/591DF2E8274C3E005E52442D2F983B49.png"><br><br>※题型：实验题※知识点：实验题※试题难度：中等<br>质量守恒定律的发现,对科学的发展<br>作出<br>了重要贡献。下图为验证质量守恒定律的实验。<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/6/B70EA2B042246ECF39EF6C024A571494.png"><br>1.写出发生反应的化学方程式。<br>2.实验中气球的作用除了使装置密闭之外,还有什么作用?(答出一条即可)<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/a00a6f9f8ead4324bd674da1fc4d3546/7BF8DAB9F7D1B4F11A5F5BD4BB7913BD.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/c38d1bf5f8dd4479bfccb5723b79cb6e/FF66730B360F16720A66B3BDC0969C81.png"><br><br>※题型：问答题※知识点：问答题※试题难度：中等<br>学习金属的化学性质时<br>,学生甲将铜片放入盛有硝酸银溶液的试管中,待溶液颜色变蓝后,取出<br>铜片。<br>1.写出该反应的化学方程式。<br>2.学生乙将一定量的铝粉加入取出铜片后的溶液中,充分反应后溶液仍呈蓝色,过滤后向滤液中加入稀盐酸,无明显现象,则可推断出此时滤液中溶质的成分是什么?<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/097c6532c0f84e0e9e88786a7b5c81d9/420B06EC8B6D2C7F39C468029356D27D.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/c487e08806af4e3d9d3807a1e23dd1ca/EBDA3DCC4F92F69065B9314EBA639FEA.png"><br><br>※题型：实验题※知识点：实验题※试题难度：中等<br>如图是实验室制取二氧化碳并验证其化学性质的部分装置。<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/26/F12623BB14C588F6DFCA229E4BABD6F3.png"><br>1.图A是实验室制取二氧化碳的发生装置,写出实验室制取二氧化碳的化学方程式,并将该装置补画完整。<br>2.B中胶头滴管和水槽中均为氢氧化钠溶液,将胶头滴管中的溶液挤入烧瓶后,可观察到什么现象?<br>3.实验结束后,若要确定烧瓶内溶液中溶质的成分,请设计合理的实验方案,简要写出实验步骤、现象和结论。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/e96017ec0f96494d9c45c3e5427e0974/985102291EEFB284ABCF6CADAA2EBFC0.png"><br>解析<br>略<br>※题型：实验题※知识点：实验题※试题难度：中等<br>酸、碱、盐是有广泛用途的重要化合物,它们的性质、制法等是化学研究的重要内容。<br>1.侯德榜先生是我国制碱工业的先驱,请用化学方程式表示“侯氏制碱法”中的如下反应:向饱和食盐水中先后通入足量的<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/7/72E318180F1C3D00E8D8DCFDB2D09C08.png"><br>和<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/7/7002435560602C62060BA723DC55D86C.png"><br>,生成小苏打(在该反应的溶液中析出)和一种氮肥。<br>2.向盛有一定量澄清石灰水的烧杯中,逐滴滴加稀盐酸,用pH传感器测得溶液的pH与加入稀盐酸的质量关系曲线如图。<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/7/31D0D08C28C953233247B12240D29424.png"><br>①请写出上述反应的化学方程式。②若把原烧杯中的澄清石灰水换为等质量、等浓度的氢氧化钠溶液进行该实验,则pH传感器测得的曲线可能经过___________(填“a”“b”或“c”)点。3.为了除去NaCl溶液中含有的少量<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/7/E419A85E51DA9D8412A6B9A1389E95C7.png"><br>可溶性杂质,向溶液中先后加入<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/7/C53AF84FCCC70466A0162C0DAD15636E.png"><br>、稀盐酸三种溶液,实验过程如图所示。(提示:微溶物不形成沉淀)<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/7/DD9369845449F4AB81161A744752804D.png"><br>①操作Ⅰ和操作Ⅱ都要用到玻璃棒,在操作Ⅱ中玻璃棒的作用是什么?②以上实验过程中所发生的复分解反应共有_______个。③用实际参加反应的离子符号来表示反应的式子叫做离子方程式,复分解反应的实质就是反应物的离子间结合生成了沉淀、气体或水。请用离子方程式表示<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/7/5020518739833AA0F61A620DBB447C84.png"><br>与<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/7/CB7E7C4BEEFBEBF27159F2B985D9C3A2.png"><br>反应的实质。④溶液X中除氯化钠之外,还含有碳酸钠和氢氧化钠,请设计实验方案证明。(简要写出实验步骤、现象)4.为测定某纯碱样品(含少量杂质氯化钠)中碳酸钠的质量分数,称取该样品25g,加入到盛有100g稀盐酸的烧杯中,恰好完全反应,反应后称得烧杯中剩余物质的总质量为116.2g。求纯碱样品中碳酸钠的质量分数。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/b29e68a2311043d599d534589971fe7d/FCBCDA2DC9F6141C1F4D1F16E4FA8536.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/8740a1b18a884f8ea441255b30e146d1/C2A92482756F61627258DF2700A458C1.png"><br><br>
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