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题文
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
题型:填空题难度:中档来源:不详
答案
(1)萘 气态 (2)水银 (3)氧  (4)D

试题分析:(1)温度低于物质的熔点该物质是固态,常温低于80oC,萘是固态;-145℃高于氧的沸点-183oC,氧处于气态;(2)萘的熔点是80oC,沸点是210oC,应选水银温度计。(3)因为氧的沸点比氮高,采用降温法,温度首先低于氧的沸点,氧气先液化(如采用升温法则相反)被首先分离出来。(4)0oC时水的状态可能是固态(冰),也可能是液态(水),当然可能是固液共存(冰水混合物)状态。注意:是指水的状态,而不是问水是否结冰。
据魔方格专家权威分析,试题“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..”主要考查你对  凝固现象熔化现象  等考点的理解。关于这些考点的“档案”如下:
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凝固现象熔化现象
考点名称:凝固现象
  • 定义:
    物质从液态变成固态叫做凝固。凝固是熔化的逆过程。凝固放热。如水结成冰,由液态变成固态属于凝固现象。

    凝固点:
    晶体开始凝固时的温度称为凝固点。同种晶体的熔点等于凝固点。

    凝固条件:(1)达到晶体的凝固点。(2)不断放出热量。

    生活中的凝固现象:水变成冰
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