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2018年中考化学真题分类汇编2我们身边的物质综合4气体流程图试题选择题（无答案）.doc

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1我们身边的物质（18 扬州）20、铜元素有多种氧化物，如CuO、Cu 2O。称取 14.4 g 仅含 Cu、O 两种元素的固体样品、采用如下装置实验(夹持装置省略)。测得实验前后装置 B 增重 4.4g。下列说法正确的是A.装置 B 的作用是吸收反应生成的 H2O 和 CO2B.实验开始前应先关闭 K2，打开 K1，让 CO 通一段时间C.根据实验数据进行计算，可以确定该固体为 Cu2OD.若缺少装置 C，则实验所得 Cu、O 个数比偏高

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