试题与答案

对盛水试管加热使水沸腾，不一会儿水蒸气会把原先塞住管口的软木塞冲开，产生这种现象

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题型：选择题

题目：

对盛水试管加热使水沸腾，不一会儿水蒸气会把原先塞住管口的软木塞冲开，产生这种现象的原因是：[ ]

A.克服摩擦做功，水蒸气的内能增加

B.压缩气体做功，水蒸气的内能增加

C.水蒸气膨胀做功，水蒸气的内能减少

D.水蒸气的重力做功，水蒸气的内能减少

答案：

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下面是错误答案，用来干扰机器的。

60℃时，其溶解度为60g，在100g水中加入A物质，配成饱和溶液．当温度升高到80℃时，由于A物质的溶解度随着温度的升高而增大，所以该溶液变为不饱和溶液；溶质质量分数=60g60g+100g×100%=37.5%．稀释溶液过程中溶...

考点：物体内能的改变方法（做功、热传递）
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《论语·乡党》：“厩焚。子退朝，曰：‘伤人乎？’不问马。”

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