请结合下列常用的仪器和装置，回答有关问题：（1）写出标号仪

问题问答题

请结合下列常用的仪器和装置，回答有关问题：

（1）写出标号仪器的名称：C：______．

（2）用高锰酸钾为原料，用装置B制取氧气，试管口须略向下倾斜的原因是______，对装置B还应该加以改进的是______．

（3）在实验室用装置A制取二氧化碳的反应的化学方程式为______；收集干燥的二氧化碳气体，可选择装置______（填序号）

（4）在实验室除去粗盐中的难溶性杂质时，除需要上图中出现的部分仪器外，还必须用到的玻璃仪器是______、______．

答案

（1）标号仪器是漏斗；

（2）用高锰酸钾为原料，用装置B制取氧气，试管口须略向下倾斜的原因是防止试管口冷凝水回流使试管炸裂；加热时在试管口要放一团棉花，防止高锰酸钾粉末进入导管；

（3）实验室用大理石和稀盐酸反应生成氯化钙、水和二氧化碳，方程式是CaCO₃+2HCl═CaCl₂+H₂O+CO₂↑；二氧化碳的密度比空气大，因此收集干燥的二氧化碳，用向上排空气法；

（4）除去粗盐中的难溶性杂质时，可用过滤的方法，过滤除了需要制作过滤器的漏斗，还需要溶解固体和承接滤液的烧杯，以及玻璃棒；

故答案为：（1）漏斗；

（2）防止试管口冷凝水回流使试管炸裂；在试管口放一团棉花；

（3）CaCO₃+2HCl═CaCl₂+H₂O+CO₂↑；D；

（4）烧杯、玻璃棒．

完形填空。
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