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﹣Could you tell me something about Harbin?﹣Sure,I Harbin many times.I know it well.( )A.have b...
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教案备课库《2016年黑龙江省鹤岗市中考英语试卷(农垦、森工用)》真题及答案
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资料在线查阅资料可知以下数据【实验步骤】学生在实验室制取乙酸乙酯的主要步骤如下①在30mL的大试管A中按体积比144的比例配制浓硫酸乙醇和乙酸的混合溶液②按下图连接好装置装置气密性良好用小火均匀加热装有混合溶液的大试管5~10min③待试管B收集到一定量的产物后停止加热撤去试管B并用力振荡然后静置待分层④分离出乙酸乙酯层洗涤干燥.【问题设计】请根据题目要求回答下列问题1写出制取乙酸乙酯的化学方程式2上述实验中饱和碳酸钠溶液的作用是填字母A.中和乙醇B.和乙酸反应并溶解乙醇C.乙酸乙酯在饱和碳酸钠溶液中的溶解度比在水中更小有利于分层析出D.加速酯的生成提高其产率3步骤②中需要小火均匀加热操作其主要理由是4指出步骤③所观察到的现象分离出乙酸乙酯后为了干燥乙酸乙酯可选用的干燥剂为填字母A.P2O5 B.无水MgSO4 C.碱石灰 D.NaOH固体5某化学课外小组设计了如下图所示的制取乙酸乙酯的装置图中的铁架台铁夹加热装置已略去与上图装置相比此装置的主要优点有.
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