题目内容

根据如下表格所提供的数据,在标准大气压下,以下判断正确的是 (     )
A.80℃的酒精是液态
B.铅的凝固点是-328℃
C.-39℃的水银吸热,温度可能不变
D.气温接近-50℃时.应选用水银做温度计的测温液体
C

试题分析: 因为酒精的沸点是78℃,所以80℃的酒精应该是气态,故A选项错误;铅的凝固点等于铅的熔点,是328℃,故B选项错误;水银在熔化过程中吸热,温度不变,此时温度是-39℃,故C选项正确;气温接近-50℃时,因为此水银已凝固.不能使用,故D选项错误;
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相关题目
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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