4.2物质组成的表示—2021-2022学年化学鲁教版九年级上册随堂小测
※题型：单选题※知识点：单选题※试题难度：较易<br><img src="https://picture2.zhihuicn.com/testImage/2/2020/8/26/AB50DA95A0B1CD0D07E552BEDF604CD5.png"><br>中“S”的化合价是( )<br>A.-2 B.0 C.+4 D.+6<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2020/9658110c17a44f9ea11aa114bfee74e9/06CA09E70C17EF8BA2D3B8C70D693953.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>下列化学用语既能表示一种元素,又能表示一个原子,还能表示一种物质的是( )<br>A.O<br>B.<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/25/D350503FAEB172B50F09D85EB5C5B0A3.png"><br>C.<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/25/82C99970BE69677DE64B1C67740773E9.png"><br>D.<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/25/4DFB8F0E078BDC07EF569A7A174E9CCB.png"><br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/9a20e4bdfa544864bc0d0b91ae3eea3c/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/9f395e59f62244aabc94c8e58d76961a/41EEEE8576FC2C84198378BC5469EB6D.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>下列微粒符号中,对“2”含义的理解正确的是( )<br>A.2Cu中的“2”表示2个铜元素<br>B.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/30/B194114AC2BB130119E31736F738F030.png"><br>中的“2”表示每个亚铁离子带有2个单位的正电荷<br>C.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/30/8BA90CB1150F90B25C2ACB57931CDD3B.png"><br>中的“2”表示1个硫化氢分子中含有2个硫原子<br>D.<img src="https://picture2.zhihuicn.com/testImage/2/2021/3/30/729CA93EADDD90D6637FE605C0287A31.png"><br>中化学式上方的“2”表示硫元素为-2价<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/a548a01facd44594a2552854697febcc/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>下列相对分子质量的计算式不正确的是( )<br>A.<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/25/0417D3AF75D87294CB1B358BDABD2D77.png"><br>的相对分子质量=39+35.5+16×3<br>B.<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/25/7002435560602C62060BA723DC55D86C.png"><br>的相对分子质量=12+16×2<br>C.<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/25/899E87B27F1236109AC87103F2D31DB2.png"><br>的相对分子质量=40+16+1×2<br>D.MgO的相对分子质量=24+16<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/a828b67579cc4fe0837f39ecac55c3a5/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/f746084ccbeb4a578f61e22ec9ecf0db/14BEA60D6F024C6033A6687C722F1E6A.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>如图是铁元素和氧元素常见化合价的坐标图,试判断<img src="https://picture2.zhihuicn.com/testImage/2/2020/8/26/65F7AF37B8A9A12B28388B5EDA6AF543.png"><br>点上形成化合物的化学式为( )<img src="https://picture2.zhihuicn.com/testImage/2/2020/8/26/6B3FCA43887A693EE56F9156E4687AD8.png"><br>A.<img src="https://picture2.zhihuicn.com/testImage/2/2020/8/26/F8A8AE58A803DD3266C9EF954E17A453.png"><br>B.<img src="https://picture2.zhihuicn.com/testImage/2/2020/8/26/37812CFF9439465CA8D26D5992A293DB.png"><br>C.<img src="https://picture2.zhihuicn.com/testImage/2/2020/8/26/FC3D94BCDE932078DC876DEF1C5FE72F.png"><br>D.<img src="https://picture2.zhihuicn.com/testImage/2/2020/8/26/F76C36CCD5F71A8DCF92459A28745F44.png"><br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2020/73fa4e7d619a47798df15af95522c24c/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2020/abaaf7e89c464a7fa96b4699eab27e54/FBFD2666CCFBE0291A432FDB8538D75E.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>.大蒜是常见的调味品之一,大蒜中主要成分大蒜素具有消毒杀菌作用。大蒜素的化学式为<img src="https://picture2.zhihuicn.com/testImage/2/2021/1/5/D508251AA149EC0B27E3653DF2849172.png"><br>,下列说法错误的是( )<br>A.大蒜素中碳、氢、硫三种元素的质量比为6:10:3<br>B.大蒜素由碳、氢、硫三种元素组成<br>C.大蒜素的一个分子由6个碳原子、10个氢原子和3个硫原子构成<br>D.大蒜素中硫元素的质量分数约为53.9%<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/cd7461a081d5494c9c3ffe5bc1f61706/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/ce00d66e28694732a2752a55f531aa1a/3C2DEE8B9C85DFACF50B2925F5F7D74A.png"><br><br>※题型：填空题※知识点：填空题※试题难度：较易<br>2019<br>年<br>月<br>日,诺贝尔化学奖授予来自日本、英国、美国的三位科学家,以表彰他们为锂离子电池的发展所<br>作出<br>的贡献。<br>锂<br>离子电池中含有磷酸锂铁(<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/6/28/8708698356B21B0E1C7E2B1DCDC393BC.png"><br>)。<br>求:<br>1.磷酸锂铁中铁元素的化合价为(已知磷酸锂铁中锂元素化合价为+1,磷元素化合价为+5)。<br>2.磷酸锂铁中铁元素的质量分数为(结果精确至0.1%)。<br>3.31.6g磷酸锂铁中所含铁元素的质量为。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/2e15ec0b7000429caf89c4e8863000ca/3596927BB8B9ACDAFD0148A7BBA7C3F4.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/a995d5a7965d45c6b969c10e6dd65e7b/98970B89C53B5CB3F0B77F60807966FC.png"><br><br>
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