某气体可能含有CO2 、 CO一种或二种。为探究其成分进行以下实验。[实验步骤]步骤一：打开K，缓缓通入干燥的氮气一段时间，关闭K。步骤二：通入待测气体，同时打开K，点燃酒精灯，进行实验。[实验结论]_刷题宝

题干

某气体可能含有CO₂ 、 CO一种或二种。为探究其成分进行以下实验。

[实验步骤]

步骤一：打开K，缓缓通入干燥的氮气一段时间，关闭K。

步骤二：通入待测气体，同时打开K，点燃酒精灯，进行实验。

[实验结论] 该气体是CO、CO₂混合物。

回答问题：

①写出B中玻璃管内发生反应的化学方程式____。

②实验过程中，根据____实验现象可以判断该气体的成分。

③对该实验的分析正确的是____(选填编号)

Ⅰ.步骤一的目的是为了把容器中空气反应完

Ⅱ.C中增加的质量与B中固体减少的质量相等

Ⅲ.省略C装置对检验的结果没有影响

Ⅳ.反应结束后继续通气体的目的是防止生成的铜与空气中氧气反应

V.实验结束应先灭B处的酒精灯

上一题下一题 0.0难度选择题更新时间:2018-04-26 07:05:23

答案(点此获取答案解析）

CO+CuO

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Cu+ CO₂

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—Mrs. Black, I'm afraid that I'll fail the exam.

—________, dear! Take it easy. I'm sure you'll pass it.

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实验室常用的气体制取装置如下，请回答：

①写出编号I仪器的名称：____；

②实验室既可以制取CO₂，又可以制取O₂的发生装置为____（填装置编号），实验室制取CO₂的化学方程式为____；收集一瓶较纯净的O₂可以选用的装置是____（填装置编号）。

③某同学利用空塑料输液袋收集二氧化碳（如图G），验满时，把燃着的木条放在玻璃管____（填“a”或“b”）端，如果熄灭则满了。

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