河南省安阳市林州2020届市九年级下学期期中考试化学试卷
※题型：单选题※知识点：单选题※试题难度：容易<br>下列生活劳作过程中含有化学变化的是( )<br>A.酿酒 B.捣蒜 C.洗菜 D.和面<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/15f9a25b5681418ead185e8c8318ba61/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/d2730b004266418f9ccd4bd6812cb0cf/22A8F8871BF5EFF3372C7823D8E6D8B7.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>大美河南,我是行动者。下列做法与这一主题不相符的是( )<br>A.回收利用废旧金属<br>B.露天焚烧枯叶、农作物秸秆<br>C.用布袋代替塑料袋购物<br>D.用共享单车代替私家车出行<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/0b7cb0233e0d49d5a8839a58b4aeb21e/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/bba0e058708840c786a11822ed818c61/0F4300170DCC54E9CB430208A9414D0B.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>生活中处处有化学。下列有关说法中不正确的是( )<br>A.厨房内天然气泄漏,要立即打开排气扇通风<br>B.冬天室内用煤炉取暖应保证烟囱通畅,防止“煤气”中毒<br>C.铁是人体中必需的微量元素,缺铁会造成贫血<br>D.用灼烧法可以区分棉花与羊毛纤维<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/7087d43079f243f583cfcb705aefc726/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/b0a78bb02d954f1094f6476a8da8b0d6/03CCD75C6E8A432DE736229ECA41E29E.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>下列实验操作正确的是( )<br>A.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/FD7211FCB4C4ACB778C88B1430CFC65F.png"><br>测定溶液酸碱度<br>B.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/D6BE19C905BF1CDC7732D3B95ABC3A36.png"><br>稀释浓硫酸<br>C.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/23BC0CFCE67B0D546DBBBACEFA0808C5.png"><br>称取氯化钠<br>D.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/0FCD698439CE57E60A4DB2B80611AFAB.png"><br>比较黄铜与铜的硬度<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/11f6692711c14bc682cd1d0d6f632a5b/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/4ed8dc1251364967bdf96ec0719045b1/1ED296CD065750F8B5926CB4BA753A71.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>“分类”可以使人们有序的研究物质,以下物质的分类正确的是( )<br>A.氧化物:干冰、葡萄糖<br>B.碱:纯碱、烧碱<br>C.盐:小苏打、硫酸铜<br>D.有机合成材料:塑料、合金<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/412266ca8aa147f690a2638a0d463392/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/6e9ec4f1ae4c4bbd8456eed7782b8fd3/B7F0C5C5299845B9821F79336AC8C10D.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>如图是钙元素在元素周期表中的相关信息及钙原子结构示意图,下列有关信息表述不正确的是( )<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/80C5D5592E98AE84FD1802E4D05015D0.png"><br>A.钙元素在元素周期表中第四周期<br>B.m的数值等于20<br>C.钙离子的符号为<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/B1BFE0DEB6907618EF464FC26E95623D.png"><br>D.钙是地壳中含量最高的金属元素<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/4f5e7cca364e4adc9989754f851fbfe9/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/32b5b7d2ca13497190785f26b7515aad/58C0D4642A299A4C2AD86E0C86EF3CFD.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>下列物质的粒子与构成<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/F9EEF40E95F5DCDB29C79A9447E02C4B.png"><br>的粒子类型相同的是( )<br>A.氦气 B.氯化钠 C.金刚石 D.水<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/6b7cd3bec11f48ff952367afe13b8872/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/1b7bc09ef9264a37aa696b81704262fd/9E2798321101BE5E7209F0C1CFB24C82.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>葡萄富含维生素C(<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/34E9A2C2AA3C1C05770C5E345C618C6E.png"><br>),下列有关维生素C的说法中正确的是( )<br>A.维生素C由20个原子构成<br>B.维生素C中含有3个氧气分子<br>C.维生素C中碳、氢元素的质量比为9:1<br>D.维生素C中氢元素的质量分数最大<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/5d7718cc3bbe4890b465fc35b4d988d6/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/d9f47eed5c8c445a9f1323fbc91f2384/E2E5F387A4377ACE07F460D7C5357670.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>下列除去括号内的杂质,所选试剂(适量,反应条件略)不正确的是( )<br>A.氮气(氧气):铜丝<br>B.铜粉(氧化铜):一氧化碳<br>C.氧化钙(碳酸钙):水<br>D.氯化钠溶液(硫酸铜):氢氧化钡<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/1e80ed76b8ee4dfc82f769c70e724ed4/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/4a2d65147e504d02a0889d0f764922a4/928E767E1285F93AE213CF85B140A69A.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>类推是学习化学时常用的思维方式。以下类推结果正确的是( )<br>A.有机物含有碳元素,则含有碳元素的物质一定是有机物<br>B.氢氧化钠溶液能使酚酞溶液变红,则能使酚酞溶液变红的物质一定是碱液<br>C.置换反应有单质生成,则生成单质的反应一定是置换反应<br>D.含碳元素的物质充分燃烧会生成<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/7002435560602C62060BA723DC55D86C.png"><br>,则燃烧能生成<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/7002435560602C62060BA723DC55D86C.png"><br>的物质一定含碳元素<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/ea9597f9566c4838b627bf6b17d3c6a9/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/ce0b569a3ea84a52a0b58004b5a11030/DBC03C897489A43ADCEEE7CF9D9F04C5.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>实验小组用传感器探究<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/79439DE1DA1D931FB78C54E47331413B.png"><br>溶液与稀盐酸反应过程中温度和pH的变化,测定结果如下图所示。下列说法不正确的是( )<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/CC8FE73AB64A7A69C2C56D3E9536F814.png"><br>A.该反应是放热反应<br>B.从30s到40s,溶液pH增大<br>C.60s时,溶液中溶质为HCl和<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/CB7E7C4BEEFBEBF27159F2B985D9C3A2.png"><br>D.在反应前后的溶液中没有结合的离子是<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/81579616347D312593374ADF9D45FA43.png"><br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/712a35355a104f948e2a224cf9be6bdb/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/4df7f57c4caf4111b81f38aa760aa0da/96DDD84CC3D60C4B9027925D99D40ADF.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>下列各组物质在给定pH的溶液中能大量共存并形成无色透明溶液的是( )<br>A.pH为3:<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/40255CB4F26CEC8F4E008AEE04A54B10.png"><br>B.pH为12:<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/556F825670A539502B2D2DBB897A03EC.png"><br>C.pH为1:NaCl、<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/5020518739833AA0F61A620DBB447C84.png"><br>、KCl<br>D.pH为11:<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/C3055EE31D3033E87C214E92F5BCE947.png"><br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/c04e642dedd041c6ad487eb3c6848b46/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/6fcbc499d45e4e0da864f74b136af342/B47B5381134D3A77B6F9BAA6E0CD652C.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>下列图像中有关量的变化趋势与对应叙述关系正确的是( )<br>A.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/FF6195E1432084B4DC91892B2117D5ED.png"><br>向一定质量表面生锈的铁钉中滴加盐酸至过量<br>B.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/16CC33A8084E3E72DC2492D3ECF2AB43.png"><br>向一定质量的稀硫酸中滴加水<br>C.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/8F80DEDA3F38F32887960379CDB7D481.png"><br>向盐酸和氯化铜的混合溶液中滴加氢氧化钠溶液至过量<br>D.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/189EE03053437F1C634A8D8012E7EEED.png"><br>高温煅烧一定质量的石灰石<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/64a4cc5c4c064c5094a75ffc475a2d10/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/26261ea3e45f4aebaad8d303ba97028d/9B34E5C72C90D270590E47B6C8E0EC25.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>向氢氧化钠和碳酸钠固体混合物5g中加入50g质量分数为7.3%的稀盐酸,恰好完全反应得到中性溶液。那么反应后所得溶液中溶质的质量为( )<br>A.5.85g B.11.7g C.17.55g D.160.3g<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/ac114ff1ad8d47eca34b52a93c723836/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/9fa1cfa80b7048a9a01f575cba4f9b08/9B34E5C72C90D270590E47B6C8E0EC25.png"><br><br>※题型：问答题※知识点：问答题※试题难度：容易<br>化学与我们生活息息相关。从下面所给物质中选择适当物质的化学式填空<br>A<br>硝酸铵<br>B<br>氢氧化钠<br>C<br>熟石灰<br>D<br>硝酸钾<br>1.用来改良酸性土壤的是______________________;<br>2.属于复合肥料的是______________________。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/f9dd87fc106f4f48a6c539c7575019f0/100FF79B386C086B9AF273CAB83CAC2F.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/9ceb4c86f15e4b578f9b9d6c9f0152b5/8E7BEE1CEE247842117FD18B3E359BFA.png"><br><br>※题型：问答题※知识点：问答题※试题难度：中等<br>某物质在氧气中燃烧的微观示意图如下,据图回答问题<br>:<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/79F6DB9AF5A517C71BFEA84AF6E67DFD.png"><br>1.上述反应中属于单质的物质是______________________;<br>2.此反应的化学方程式为______________________。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/3ee80a9e5cda4f869694ef6c024b343c/100FF79B386C086B9AF273CAB83CAC2F.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/481ef9b1a20c495fbe39f9678758152a/8E7BEE1CEE247842117FD18B3E359BFA.png"><br><br>※题型：问答题※知识点：问答题※试题难度：较易<br>雷神山医院为武汉人民战胜新冠病毒提供了强大的物质基础。请回答下列问题<br>:<br>1.酒精是杀死新冠病毒的外用消毒剂,也是实验室常用的燃料。酒精燃烧的化学方程式是_______;<br>2.医院病人午餐食谱如下:米饭、红烧肉、牛奶、鸡蛋西红柿汤,其中富含糖类的食物是_______;从营养角度看,你认为还应该添加的食物是_____________。3.为保证饮水安全,向水中加入<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/DAA989B03F6A5C3172692384FC7517A6.png"><br>进行消杀,其中氯元素的化合价是____________。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/9f0c6f96ccbd4e8296fdfe14bec0dbdd/AA83F01F5D10BAD268902E68B80CCADB.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/f5751bfb33ab47e48560c83f69e8c449/20C839C80EDCE4B92CCA1E0C4492FB60.png"><br><br>※题型：问答题※知识点：问答题※试题难度：中等<br>如图为甲、乙两种物质的溶解度曲线图,根据该图回答下列问题<br>:<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/C92A841E1189848D8FCFE54714ED7BF0.png"><br>1.30°C时,将25g甲放入50g水中充分溶解,所得溶液的质量是_______________g;若将该溶液稀释为5%,需要加水_____________g。<br>2.将30°C等质量的甲、乙两物质的饱和溶液降温到20°C,甲溶液中溶剂的质量_______(填“>”、“=”或“<”)乙溶液中溶剂的质量。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/44c4ea96ab8b4c1892195d29105fad5c/F6480F0CF2268B9310E8F0B955F07F76.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/e414b20835d94121ac512cf8e5b9ab4d/65DAB0BC0B86EA299F108C43127751E1.png"><br><br>※题型：填空题※知识点：填空题※试题难度：中等<br>在点燃条件下,<br>2.6g<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/3F35407DDDC6C8B2AAA26FB695FA81F4.png"><br>与<br>Xg<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/43916A0CBDACF639905BC5CD89370C97.png"><br>恰好完全反应生成<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/AA5DD1505F1D7A06A012CABC988FF45C.png"><br>,6.6g<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/7002435560602C62060BA723DC55D86C.png"><br>和<br>1.4gCO<br>。那么<br>X<br>是<br>________<br>,该反应的化学方程式是<br>_________<br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/d530b8dc10594c01ba11b77792596c85/E565C7F34D9684033B36FB6AAED0C39D.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/a81dd62c8cd24bba8f9ed93e5641a592/8B3250E53C8995386B858AF8705B0266.png"><br><br>※题型：填空题※知识点：填空题※试题难度：中等<br>物质<br>A<br>、<br>B<br>、<br>C<br>、<br>D<br>、<br>E<br>、<br>F<br>之间存在如图的转化关系(部分物质及反应条件已略去),已知<br>A<br>是一种气体肥料,<br>E<br>是苏打,<br>D<br>含有人体中含量最高的金属元素,其相对分子质量为<br>100<br>。则<br>A<br>的化学式为<br>_________<br>;<br>C<br>物质的一种用途是<br>_______<br>;<br>E→F<br>的化学方程式为<br>_________<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/DB6513D3480C267D6E08D3F403405141.png"><br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/9a8e0b208e4b4c44b59d5f0784913b7b/B12F27D500DF6CAF1810FC419602830C.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/ac6dfec2ed344550b556448391b54b1c/D353423890E44A61FD7F0F3C26E052D6.png"><br><br>※题型：问答题※知识点：问答题※试题难度：中等<br>控制变量法是实验探究的重要方法。利用下图所示实验回答问题<br>:<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/725B5A4CC42A0397050674B2274D3F1B.png"><br>1.甲图②试管中将蒸馏水煮沸的目的是什么_______?<br>2.乙图中验证的燃烧条件是什么_______?<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/30826d2806534a718064aaf2ca72c754/D14FB1843BD3AD13151474CA8FAE3C64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/d84b1688e4414706bf3bfd94667fe7d2/3C26241C44A6EACB0B2180597B6ABC0B.png"><br><br>※题型：问答题※知识点：问答题※试题难度：中等<br>某化学小组把一定量的铜和铝放入<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/C09DD76B9792A4D62AC4145DC76E807C.png"><br>和<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/A5C332C77315A742B3681644C27D276B.png"><br>的混合溶液进行实验,过滤,得到滤液和滤渣。请回答以下问题<br>:<br>1.若滤液为蓝色,向滤渣中滴加盐酸时________________(填“有”或“没有”)气泡产生。<br>2.若滤液为蓝色,滤渣中可能有_________________;3.若滤液为无色,请解释反应后滤液质量比原混合溶液减少的原因_______。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/1de8807cf33a467bb83bee6b35ff684d/DACE8CA94213162C21BCD5CB0EE2B7E9.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/dfb6d48e6f7c415abd5511a10796804b/53F281DA654620A49C511870C913228E.png"><br><br>※题型：问答题※知识点：问答题※试题难度：中等<br>粗盐中常含有氯化钙、氯化镁、硫酸钠等杂质,某同学设计如下实验流程提纯粗盐,所加试剂均过量<br>:<br>NaOH<br>溶液、<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/12F5C4AC564AD3765E56094E20CC81FF.png"><br>溶液、<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/5020518739833AA0F61A620DBB447C84.png"><br>溶液和稀盐酸。请回答下列问题<br>:<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/358D12119812E5860E87FE7EB0B34BB3.png"><br>1.在步骤①中发生反应的化学方程式是_______________。<br>2.步骤②中所滴加的试剂是_______________。3.过滤所得滤液中溶质有______________种。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/5e46289c6001409598a1ccab569f7d05/7CAA689B445231D0732F3F9333856E27.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/43bd078cf0b746f5b527d6603f28673e/FDAD6F721B10EC649B3B5204AF5522A1.png"><br><br>※题型：实验题※知识点：实验题※试题难度：中等<br>化学是以实验为基础的科学,实验是科学探究的重要手段。<br>(<br>)根据下图所给装置回答问题。<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/05CC9DA47B33A448B31439AC60B6EF33.png"><br>①<br>若实验室用甲装置制取氧气,其反应原理的化学方程式是<br>_______________<br>②<br>若用向上排空气法收集氧气,请将丁装置补充完整<br>_______<br>③<br>锌跟浓盐酸反应制取的氢气中常带有<br>HCl<br>气体和水蒸气,若欲用乙、丙装置净化除杂得到纯净、干燥的氢气,那么乙、丙装置的导管<br>口如何<br>连接<br>_______?<br>(<br>)如图是二氧化碳的制取微型装置图,请回答。<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/3/8/110B119C5EF99A855B77BCBCAD3A2822.png"><br>①<br>在装置<br>“1”<br>处放置试剂<br>______________<br>,用来验证制取的气体是二氧化碳<br>;<br>若在<br>“2”<br>处盛放有少量的紫色石蕊试液,那么出现的现象是<br>__________________<br>②<br>用橡胶<br>塞塞紧集气管<br>口,挤压胶头滴管,<br>二氧化碳气体进入氢氧化钠溶液,反应的化学方程式是<br>:___________________<br>;<br>③<br>请设计实验证明烧杯中氢氧化钠溶液没有完全反应<br>_______<br>(<br>)将铁和氧化铁的混合物<br>20g<br>放入玻璃管中,<br>在高温的条件下通入足量的一氧化碳气体,充分反应后称得玻璃管中铁的质量是<br>15.2g.<br>求原混合物中氧化铁的质量是多少<br>_______?<br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/862da81945584d6fa862cd80a25f3845/EE1C18634D29E5BB9BE586615F5DDD26.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/37d158e077fd4da2a303a81f15b9bd77/F7EF71AF5C086EE07C10783612E3D08B.png"><br><br>
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