（14）化学式与化合价—2021-2022学年化学人教版九年级上册同步课时作业
※题型：单选题※知识点：单选题※试题难度：较易<br>下列方框中,符合<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/4/FA17D74DB309B28CDB3CDDF844DB126D.png"><br>意义的示意图是( )<br>A.<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/4/F316621976CC8203BD92EEE84C56A064.png"><br>B.<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/4/796ED16DF561C1E251A5AF0A988181EF.png"><br>C.<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/4/D4868BDEFAE1D2EAB5610D1228A37477.png"><br>D.<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/4/BFB06635A943BBCD7124465D1B5DEAF6.png"><br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/8850d80f55b3459aacc6213c63c1dbca/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>化学式<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/4/7DB234BC8ABC7F751AB9BAA992EEF152.png"><br>能表示多种意义,下列说法错误的是( )<br>A.表示过氧化氢这种物质<br>B.表示过氧化氢由氢元素和氧元素组成<br>C.表示1个过氧化氢分子<br>D.表示过氧化氢由2个氢原子和2个氧原子构成<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/e233e9f8318f4bbcb7026e9ef08a470b/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/63bcca814ae24e43a59e3c5b6ac4451f/A45EC7C34EC03ADDF759AAFA0A494A1C.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>如图所示,这四位同学描述的是同一化学符号,此化学符号是( )<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/4/1BB3EE089E7C4DB4A13782383F6BFE11.png"><br>A.HCN<br>B.<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/4/D4C5BB6900DD1B4D2198380F5830F64C.png"><br>C.<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/4/DAA989B03F6A5C3172692384FC7517A6.png"><br>D.<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/4/72E318180F1C3D00E8D8DCFDB2D09C08.png"><br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/4eb8d6eac1834e799e563833babac18e/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>近期媒体曝光了某品牌的洗发水中含有致癌的成分——二恶烷(<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/28/CF841FFED8AF399E159E6ED7CA6CF2D2.png"><br>),下列有关二恶烷的说法正确的是( )<br>A.二恶烷是氧化物<br>B.二恶烷是由4个碳原子、8个氢原子和2个氧原子构成的<br>C.二恶烷中碳、氢、氧元素的质量比为6:1:4<br>D.一个二恶烷分子中含有一个氧分子<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/63ba89e431cf42c3a4f4cf9969302255/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/ffaaf085cbc143b8830f6fc9881db77c/305ED65F228DAED25846547DC1C90E81.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>某种电池的正极材料由锂(Li)、钴(Co)和氧元素组成,三种元素的化合价分别是+1、+3、-2,则该物质的化学式为( )<br>A.<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/4/32DD5F892CB3115493441AD972DD151E.png"><br>B.<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/4/AD5050364A22126CE479C66A9F16EB45.png"><br>C.<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/4/C3987AA0ED91F9779EE7000BCAB5118C.png"><br>D.<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/4/4D029C4C9954613020AC76073114CAF5.png"><br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/34e7ea69d0974755a6f482506b0ba03a/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/ce1b5e5f260446f9a15563fce7e72174/E6877BD4909B6A0C4CFEF67199087FAC.png"><br><br>※题型：填空题※知识点：填空题※试题难度：容易<br>用化学用语表示或写出物质名称<br>1.氧元素。<br>2.2个氧原子。<br>3.1个碳分子中有60个碳原子_____。<br>4.2个氮分子_____。<br>5.3个四氧化二氮分子_____。<br>6.保持氢气化学性质的最小粒子_____。<br>7.<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/4/93A19C6BBAAC4C42F35EECD724B1E7B2.png"><br>_。<br>8.Zn。<br>9.Hg。<br>10.He。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/0b2735b1acfc46378ba9fef90f617feb/94CC163495F4F80551D31AB2A9A0F05D.png"><br>解析<br>略<br>※题型：计算题※知识点：计算题※试题难度：中等<br>2019<br>年年末,高传染性“新冠肺炎”在我国部分地区流行,全国上下“万众一心,众志成城,抗击新冠”,进行合理的药物消毒是预防“新冠”病毒感染的重要手段之一。过氧乙酸是较为有效的一种消毒剂,其化学式为<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/6/29/63A25797A4DE769FD639868387080FED.png"><br>,根据过氧乙酸的化学式进行计算。<br>1.过氧乙酸的相对分子质量:。<br>2.过氧乙酸中碳、氢、氧元素的质量比:(用最简比表示)。<br>3.过氧乙酸中氧元素的质量分数:(结果精确到0.1%)。<br>4.15.2g过氧乙酸中所含氧元素的质量与多少克过氧化氢中所含氧元素的质量相等?(写出计算过程)<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/2512d1e8aea243eca7464a9fa8881df1/ACD909C65A8911AB0927160BD2C71A14.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/0d52f326216c4984a537d4898bb66ecc/E631C97F3A60180C76E5FB8DA36B55F0.png"><br><br>
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