2021届中考化学抢分猜题卷 重庆地区专用
※题型：单选题※知识点：单选题※试题难度：中等<br>成语是中华文化的瑰宝。下列成语涉及化学变化的是()<br>A.泛滥成灾 B.滴水成冰 C.死灰复燃 D.聚沙成塔<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2020/70886e1e74d544c8863ac43677167196/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2020/ba2db970357849eb96b974d8d79f251f/6468DA5E821A8F6A3B668846E6DA0591.png"><br><br>※题型：单选题※知识点：单选题※试题难度：容易<br>下列不属于目前计入空气质量评价主要污染物的是( )<br>A.二氧化硫 B.二氧化碳<br>C.细颗粒物 D.可吸入颗粒物<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/66235147e21843788234286d45b0794f/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br>略<br>※题型：单选题※知识点：单选题※试题难度：容易<br>开发和利用新能源是解决能源危机的重要方法。下列不属于新能源的是( )<br>A.地热能 B.乙醇汽油 C.太阳能 D.风能<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/e5377817652e4da985d661ad5fe53c78/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/c0f1619312e0494a8fed813637cbc133/09FF21157A479EFB1DCDC05E9045F561.png"><br><br>※题型：单选题※知识点：单选题※试题难度：容易<br>下列主要为人体提供能量的是( )<br>A.米饭 B.水果 C.矿泉水 D.蔬菜<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/50dc6ebdf0864dffabe12ed873db6771/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br>略<br>※题型：单选题※知识点：单选题※试题难度：中等<br>把少量下列物质分别放入水中,充分搅拌,可以得到溶液的是( )<br>A.花生油 B.面粉 C.汽油 D.酒精<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/0bd765d5e7cb4a74a1d9b183514979f5/01A39E48B8A67989A23F6887F26FCC64.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>已知室温下NaCl的溶解度约为36g。现称取3.6g粗盐,经过溶解、过滤、蒸发、转移等步骤,除去泥沙得到精盐。下列操作正确且合理的是( )<br>A.溶解<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/15/23C909DA3E4D6F4743C4B94BA8FA6781.png"><br>B.过滤<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/15/C162D241E8482DCAE8A8F3E0287BD86D.png"><br>C.蒸发<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/15/C3393DFB7971FE1BBFDD616B955331BC.png"><br>D.转移<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/15/9E63D9A6F860716BB7D99A2F10870CD7.png"><br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/9587bd328c8f4717b51b51b84fd4ab8b/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/7413d09766e349d39f5f5da3b0b08bd3/F2020E6B92B064A282AA0AC2A746F0FE.png"><br><br>※题型：单选题※知识点：单选题※试题难度：容易<br>施肥是农业增产的重要手段。下列化肥中,属于复合肥料的是( )<br>A.<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/15/9657CD6677A8B536DA52BF72946AF00F.png"><br>B.<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/15/425BA1BC5CB1DCBE34ED09173920FCEF.png"><br>C.<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/15/5B107E9D1161CC37DDDA995EEDC93E2D.png"><br>D.<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/15/6F9C1F8B75AFD05F72BCE40CD294D8A1.png"><br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/06f9e597b9a64c639d2ffa8ab1170872/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/5e6a5241a3fe42d9b53fe8489aa255e7/39559969BB2B65C341E66FA978B9C25C.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>深海鱼油中的DHA(化学式为<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/15/E7A9F01A08B556BC30410588FAEBB0B5.png"><br>)是一种特殊的不饱和脂肪酸,这种不饱和脂肪酸是大脑细胞形成、发育及运作不可缺少的物质基础。下列关于DHA相关说法中正确的是( )<br>A.DHA由56个原子构成<br>B.DHA中C、H、O三种元素的质量比为11:16:1<br>C.DHA的相对分子质量为328g<br>D.DHA中氢元素和氧元素的质量分数相等<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/b93172dab53040bd8d2752888b8d6232/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/44310628ea7e4dc2830b2b7d9876517e/2E40D001EB42057C7E1F63C1E0CA7F4C.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>氢氧化锂可吸收宇航员呼出的二氧化碳,该反应的化学方程式为<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/15/AAAA10D4C929CDBFB1A76371458B6541.png"><br>。下列说法错误的是( )<br>A.X的化学式为<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/15/7002435560602C62060BA723DC55D86C.png"><br>B.氢氧化锂属于碱<br>C.该反应属于置换反应<br>D.<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/15/7002435560602C62060BA723DC55D86C.png"><br>和<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/15/D72070A26C44ED441DF21B579FC314C2.png"><br>中碳元素的化合价相同<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/df22eb0be9d14430880e3530c8f6b625/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/04edd15d99fa448fac20a3d3a8682866/1CC3521766AB29C34715DA5DD8F03CA8.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>我国科学家研制出在可见光下将水和二氧化碳转化为甲烷的复合光催化剂,其催化反应的微观示意图如下。下列说法正确的是( )<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/15/8F22E58D518A39953B841AFECDAC8A87.png"><br>A.反应前后催化剂的性质不变<br>B.反应前后碳元素的化合价不变<br>C.反应生成物的分子个数比为1:1<br>D.对缓解人类能源危机有重要意义<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/974343bf0c564e3eb80fb307318d623c/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/509f2a7229584bc5ac78fc57e85e0acb/FF33C6B7E3F4873C7ECC8B14A7403847.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>下列图像能正确反映对应变化关系的是( )<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/19/37DEBFC2EB32657E9A9B962BB0447BC4.png"><br>A.向一定量的过氧化氢溶液中加入少量二氧化锰<br>B.在密闭容器中用足量红磷测定空气中氧气的含量<br>C.向一定量的氯化铜和稀盐酸的混合溶液中滴加氢氧化钡溶液<br>D.向一定量的铜粉中加入硝酸银溶液<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/5de990d73fb644c588824e6b9d3a667b/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/440d60ca98d24af197b48b5ab1e358d1/BDEAF05F6AAC3C0E5B30049AA0953AFD.png"><br><br>※题型：填空题※知识点：填空题※试题难度：容易<br>用化学用语填空。<br>1.地壳中含量最多的元素是__________________。<br>2.盐酸的溶质为__________________。<br>3.纯碱的化学式为__________________。<br>4.赤铁矿的主要成分是__________________。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/de86dfdd283a4db0b5845fe61b4a542f/3CF6AF697A31C03907A78D80F9926073.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/897a75d4df5343a989c734b0d9edc66e/B84A885B39A1DCD5B516FF2AA387D281.png"><br><br>※题型：填空题※知识点：填空题※试题难度：较易<br>铁和铁的合金是目前使用非常广泛的一种金属材料,如图是铁原子结构示意图,仔细分析并回答:<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/10/BE760094ADFD7EBC80C62FA87933350E.png"><br>1.人体缺铁容易患贫血病,这里的“铁”是指_______________(填“分子”“原子”“离子”或“元素”)。<br>2.铁原子结构示意图中,有_______________个电子层,<br>x<br>的值为_______________。<br>3.工业上用赤铁矿(主要成分是<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/10/4291691F67BE513204B38B2B82064543.png"><br>)来炼铁,化学反应原理是_______________。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/c7b6fee8f23d4610a93ac9f7e5a49c61/993081B983881C20D879F71D8F8979B4.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/ca3f4f9596bd4cac993c5e3324f62f92/F786D42A551E9825E967C0DD1F4838EF.png"><br><br>※题型：实验题※知识点：实验题※试题难度：中等<br>化学是一门以实验为基础的科学,下面是初中化学中几组重要的对比实验。<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/14/0A621AEC44D508F359D7F5E61F20A254.png"><br>1.实验1中,观察到A烧杯中的现象是,由此可验证分子的性质。<br>2.实验2中,观察到铜片上的白磷燃烧而红磷不燃烧,可得出可燃物燃烧的一个条件为。<br>3.实验3中,实验过程中布条能变红色的试剂瓶是_______________,C烧杯发生反应的化学方程式为_______________。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/5643c7c62d8648789bbe04e5df8a6782/15D62EDE388B99EE9A2C3FF815E11372.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/8480319e96cb43ecbfdd376c9a287462/0B0430336A2F0B97B82E27E67C73FB26.png"><br><br>※题型：填空题※知识点：填空题※试题难度：中等<br>金属元素组成的各种物质在生产、生活中有广泛的应用,请回答下列问题。<br>1.铁制品保存不当容易生锈,实际上是Fe与空气中__________(填化学式)发生化学反应的过程。下列措施能防止铁制品锈蚀的是__________(填标号)。A.涂油、喷漆B.久置于酸性环境C.用盐水清洗D.镀耐腐蚀的铬层2.高纯氧化镓是一种生产半导体重要的材料,其一种制备方法如下:步骤Ⅰ:向含有硫酸的硫酸镓溶液中通入氨气(<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/10/72E318180F1C3D00E8D8DCFDB2D09C08.png"><br>),冷却,生成<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/10/1C4C14CF347D4B01C6BEA9A508EB29D8.png"><br>固体。在反应过程中所有元素的化合价没有变。步骤Ⅱ:在一定条件下灼烧<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/10/1C4C14CF347D4B01C6BEA9A508EB29D8.png"><br>固体,制得高纯氧化镓。①<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/10/1C4C14CF347D4B01C6BEA9A508EB29D8.png"><br>中含有的带电的原子团(根)是__________(填化学符号)。②步骤Ⅰ反应的化学方程式是__________。3.在<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/10/045FE2AB4DB6186F9A76FDA18B92999C.png"><br>和<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/10/C09DD76B9792A4D62AC4145DC76E807C.png"><br>的混合溶液中,加入一定量镁粉和锌粉的混合物,充分反应后过滤,得到滤渣和滤液。下列说法中正确的是__________(填序号)。a.若滤液为浅绿色,则滤渣中可能有锌b.滤液中一定有<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/10/F3788D2427B44FF1A7424A8B010439DA.png"><br>,滤渣中一定有银c.若取少量滤液,加入KCl溶液,无明显现象,则滤渣中一定有铁d.若取少量滤渣,加入稀盐酸,产生气泡,则滤渣的组成有三种情况<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/253dccc253014b8bbf3d992ee1fd0235/82ED7C3334BE8B3CE51C7C2FFE9C9D13.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/d1f0d1d449844faaa77ff5039d6693ce/722DEBB2BAC000B70C749A6CF25307DF.png"><br><br>※题型：填空题※知识点：填空题※试题难度：中等<br>氯<br>碱工业<br>以粗盐(主要成分是<br>NaCl<br>,含少量泥沙、<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/14/DCFFD45E6066AE19EDBED294407130F2.png"><br>)为原料,生产氯气和<br>氢氧化钠<br>,模拟流程如下。<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/14/9C00DB40378C857A8E530158AF524BCA.png"><br>资料:部分物质的溶解性<br><tbody><br>物质<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/14/3896F087FAA56E309FBE5400D706009C.png"><br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/14/2AF4B38ED3DA4A0676087C3FEA1A2926.png"><br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/14/CB7E7C4BEEFBEBF27159F2B985D9C3A2.png"><br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/14/0125C0E265985712A3A9CAA2643B9043.png"><br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/14/49A16F7E6099868868A4ADE3D5A333A9.png"><br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/14/3F30495D3823C08C764DD559232947A7.png"><br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/14/860E0DE1FD8107FBFA0AFA7E46C0BFDB.png"><br>溶解性<br>溶<br>溶<br>溶<br>不溶<br>溶<br>微溶<br>不溶<br></tbody><br>1.试剂A与试剂B的组合为(填序号)。①<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/14/3896F087FAA56E309FBE5400D706009C.png"><br> ②<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/14/FC36191549301C2A156A2084670322F1.png"><br> ③<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/14/2AF4B38ED3DA4A0676087C3FEA1A2926.png"><br> ④<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/14/5020518739833AA0F61A620DBB447C84.png"><br>2.流程中Mg元素必须转化成____________(填化学式)才能完全除去。<br>3.写出电解NaCl溶液的化学方程式:_______________。<br>4.该工业副产品<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/14/3FD11E2AFC06B1D240106659D73AE871.png"><br>目前还不能作为燃料被广泛应用,其理由____________(答一条即可)。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/f87d95595c6e4033bdec36b6d2a557f1/949ED4B503D1D5994A2E2772AB1BE672.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/9c51df41ebb54837998b6e933b0d3feb/B2BE0D287BE714C371C8D3A84B9E0B03.png"><br><br>※题型：实验题※知识点：实验题※试题难度：中等<br>如图是初中化学中常见的仪器装置,请认真观察后回答有关问题:<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/13/A3F110BDC206D4D46384E4668FD45176.png"><br>1.A装置中仪器M的名称为。<br>2.实验室用石灰石和稀盐酸反应制取<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/13/3CE7A15F904FDDE37E20411B3EF3AF81.png"><br>气体时,选用的发生装置是_______________(填字母序号),该反应的化学方程式为_______________。<br>3.装置C、D、E均可用于排空气法收集气体。若用C装置排空气法来收集氢气时,气体应从(填“a”或“b”)端进入。<br>4.使用F装置分离物质时,玻璃棒的下端要斜靠在。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/2a889efb685c42308ed0fdcd0bdc305a/ECC9216E35DCDC4F15998785EEA4AFEE.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/18ea74fe7461477a853a03c22f7db3cc/648C2073F67AEC7F4909D837CCE53110.png"><br><br>※题型：实验题※知识点：实验题※试题难度：中等<br>化学实验小组的同学在实验室里发现桌上有瓶敞口放置已久的<br>NaOH<br>溶液。小李对这瓶久置<br>NaOH<br>溶液进行如下系列实验,实现药品再利用。<br><strong>【实验<br>探究久置<br>NaOH<br>溶液变质情况】</strong><br>[<br>查阅资料<br>]<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/10/12F5C4AC564AD3765E56094E20CC81FF.png"><br>溶液呈中性。<br>[<br>提出猜想<br>]<br>猜想<br>:久置<br>NaOH<br>溶液部分变质;<br>猜想<br>:久置<br>NaOH<br>溶液完全变质。<br>[<br>实验探究<br>]<br>(<br>)久置<br>NaOH<br>溶液变质的原因是<br>_<br>__________________<br>(用化学方程式表示)。<br>(<br>)小李设计了如下实验进行探究。<br><tbody><br>实验步骤<br>现象<br>步骤<br>一<br>取少量久置<br>NaOH<br>溶液样品于试管中向其中滴加过量的<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/10/12F5C4AC564AD3765E56094E20CC81FF.png"><br>溶液<br>(<br>发生反应的化学方程式是<br>_<br>_________<br>)<br>产生白色沉淀<br>步骤<br>二<br>过滤,向滤液中滴加酚酞溶液<br>酚酞溶液变红<br></tbody><br>[<br>得出结论<br>]<br>猜想<br>_<br>________<br>(填序号)成立。<br><strong>【实验<br>测定久置<br>NaOH<br>溶液中<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/10/5020518739833AA0F61A620DBB447C84.png"><br>的质量分数】</strong><br>[<br>查阅资料<br>]<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/10/CB7E7C4BEEFBEBF27159F2B985D9C3A2.png"><br>固体可以干燥<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/10/7002435560602C62060BA723DC55D86C.png"><br>气体<br>[<br>实验操作<br>]<br>小李试图通过测定生成的<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/10/7002435560602C62060BA723DC55D86C.png"><br>质量,粗略确定久置<br>NaOH<br>溶液中<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/10/5020518739833AA0F61A620DBB447C84.png"><br>的质量分数,设计了如图所示装置并进行如下实验<br>:<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/10/9EC79B5BD2770DE85331D06FCD395BCB.png"><br>步骤①:取一定质量的久置<br>NaOH<br>溶液,加入气密性良好的锥形瓶中,然后在分液漏斗中加入足量的稀硫酸,称出装置总质量为<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/10/B7CF316158CE6B89AE375D30CF5A42AE.png"><br>;<br>步骤②:打开分液漏斗旋塞,逐滴加入稀硫酸,待<br>_<br>_________<br>时,关闭旋塞,称出装置总质量为<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/10/A6597A662F39E111A6A0D7BFE69729CC.png"><br>[<br>反思交流<br>]<br>若用<br>NaOH<br>固体来代替球形干燥管中的<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/10/CB7E7C4BEEFBEBF27159F2B985D9C3A2.png"><br>固体,测得<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/10/5020518739833AA0F61A620DBB447C84.png"><br>的质量分数将<br>_<br>________________<br>(填“偏大”“偏小”或“无影响”)<br><strong>【实验<br>久置<br>NaOH<br>溶液的再利用】</strong><br>小李将剩余的久置<br>NaOH<br>溶液倒入烧杯中,加入适量的<br>_<br>__________<br>溶液,充分搅拌、静置、过滤,得到<br>NaOH<br>溶液和滤渣。<br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/a38d266eabf14e959cb4b823ac163f35/EA8EC485AB7E7797CCC1C186524B5B00.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/f29d53513d4d4e3b940c932c6c8f1c62/6CA5F422AB0B8B3F89E0F3E08598055E.png"><br><br>※题型：计算题※知识点：计算题※试题难度：中等<br>碱式碳酸铜<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/10/9DFB5131218447D3E3885F0E30C58771.png"><br>用作农药防治小麦黑穗病。化学小组的同学利用<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/10/2E77E19BF56267D6F878C1A7B301BD43.png"><br>测定<br>40g<br>农药中碱式碳酸铜的质量。将农药放在烧杯中,逐滴加入溶质质量分数为<br>10%<br>的稀盐酸至恰好完全反应,共用去稀盐酸<br>146g<br>(假设该农药中的其他成分不与稀盐酸反应,也不溶于水)。<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/4/10/53EF1AB03C3F0B44563A5701F8F83E14.png"><br>的相对分子质量为<br>,试计算:<br>1.<img src="https://picture2.zhihuicn.com/testImage/2/2021/4/10/53EF1AB03C3F0B44563A5701F8F83E14.png"><br>中碳元素与氢元素的质量比是_________(填最简整数比)。<br>2.40g农药中碱式碳酸铜的质量。<br>3.恰好完全反应时所得溶液中溶质的质量分数(计算结果精确到0.1%)。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/24069c603f3e4d249aabbe1c54a1c1a2/B66A344110B11D810288956C43900B1E.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/4704ec9480fc44b49688e7080d7ad905/7414AB1E6A1D733C5679E0A7A572B7E5.png"><br><br>
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