2021-2022学年八年级全一册化学鲁教版（五四制）暑假提前学（5）水分子的变化
※题型：单选题※知识点：单选题※试题难度：较易<br>如图是电解水实验的装置图,下列说法正确的是( )<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/21/650D39E2577094B345577F00621E5F57.png"><br>A.在水中加入少量氢氧化钠以增强导电性<br>B.a、b玻璃管中产生的气体分别是<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/21/CE3FB2E68B350B28E5B76D176FE3FE33.png"><br>和<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/21/BDF900345AF09A3015F45B2669FF3895.png"><br>C.水分子的模型可以用<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/21/7873E33A4C2BDC004929B3FE1D7C7DF5.png"><br>来表示<br>D.此实验得出的结论:水是由氢气和氧气组成的<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/2ff399503b8f47cf864c108df1e5488d/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/7eb446fb754c4039b1c31dc04f0bf056/65A27CB43A7A285F04C3E3BA738EC86C.png"><br><br>※题型：单选题※知识点：单选题※试题难度：容易<br>下列是一些物质的自我介绍,其中介绍自己物理性质的是( )<br>A.“铜丝”:我能导电<br>B.“白磷”:我能自燃.<br>C.“金箔”:我具有稳定性<br>D.“铁钉”:我容易生锈<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/c7fbf72efca741f8b135234112080d28/E7F0EDF83F40244C8F0C84B97471AED6.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>下列反应既不属于分解反应,也不属于化合反应的是( )<br>A.氢气+氧气<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/21/97C262C59CEFD5DBD10A1F747DE6CCA9.png"><br>水<br>B.氢气+氧化铁<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/21/1BBFF2106E16AED3422A14E9BABF54C8.png"><br>铁+水<br>C.碳酸<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/21/5E654A2F5A01891C0FBAAA23E2E072C0.png"><br>水+二氧化碳<br>D.双氧水<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/21/A9585E26A797075F42F2D8AC971C95A4.png"><br>水+氧气<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/38108fd4cbcf4f8f90b8cb526c2070f9/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/c68fa480ae1b44528646033799cbd1de/5F4509B9EEAE4BD2857B9E07D272C4CD.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>在收集氢气、检验氢气纯度的实验操作中,不正确的是( )<br>A.用排水法收集一试管气体<br>B.用拇指堵住试管口,管口向上,靠近火焰,移开拇指点火<br>C.如果听到的声音很小,表示气体较纯<br>D.如果听到尖锐的爆鸣声,可直接用排水法收集一试管氢气,再进行检验<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2020/b75d7b02575948319b9b109acd4aa1d8/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2020/bd8aa855d5c448c4bca380bfaf6616d9/234895ADB5F0673277E7EEFA9AF89C2B.png"><br><br>
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