题目内容

下列关于热现象的说法中正确的是                            【  】
A.深秋的早晨,枯草上的霜是水凝固形成的
B.夏天,我们看到冰糕冒“白气”是一种汽化现象
C.从冰箱取出的“易拉罐”过一会表面有水珠,是空气中的水蒸气液化形成的
D.用久了的白炽灯泡内表面发黑,是钨蒸汽液化后再凝固的结果
C

试题分析:A、霜是水蒸气的凝华现象,选项说法错误,不符合题意;
B、冰糕冒“白气”,是空气中的水蒸气遇冷液化形成的,选项说法错误,不符合题意;
C、“易拉罐”过一会表面有水珠,是空气中的水蒸气遇冷液化形成的,选项说法正确,符合题意;
D、白炽灯泡内表面发黑,是钨在高温下升华后再凝华的结果,选项说法错误,不符合题意。
故选C。
点评:解决此类问题的关键是要正确判断物态,并结合物态变化的名称进行分析解答.
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下表中列出了一些物质的熔点和沸点(1标准大气圧下),根据表中数据回答下列问题:
物质
熔点(℃)
沸点(℃)

0
100

80
210
水银
-39
357
酒精
-117
78

-210
-196

-268
-183
(1)表中所列物质在常温下属于固态的是________;氧在-145℃时所处的状态是______
(2)要探究萘的熔化和沸腾过程中温度的变化,应选_______作温度计的测量物质。
(3)如果在1标准大气压下用降温的办法从空气中提取氧和氮,那么温度下降时首先液化被分离出来的是                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  (4)1标准大气圧下,当温度为0℃时,水的状态(  )
A.一定是固态            B.一定是液态      
C.一定是固液共存态       D.以上三种状态都有可能

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