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

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

题型:不详难度:来源:
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

答案
C
解析

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;
举一反三
如图所示,把装有碎冰块的试管,插入烧杯里的碎冰块中,然后把烧杯放入10℃的房间,当烧杯内的冰块熔化一半时,试管里的冰将(     )
A.不熔化B.熔化一半
C.全部熔化D.开始熔化

题型:不详难度:| 查看答案
火山喷发时,高温的岩浆会使附近高山上的冰层熔化,导 致 河 流 水 位 暴 涨,岩浆后
            (填物态变化名称)成火山岩。科学家发现火山岩离火山口由近而远依次是:橄榄石---辉石---角闪石----黑云母----正长石----白云母----石英。由此可以判断出这些矿物中熔点最高的岩石是              
题型:不详难度:| 查看答案
用如图所示装置探究萘熔化时温度的变化规律。请回答下列问题:

(1)将装有萘的试管放入水中加热,而不是用酒精灯直接对试管加热,这样做不但能使萘受热均匀,而且萘的温度上升速度较        (选填“快”或“慢”),便于及时记录各个时刻的温度。
(2)除采取水浴法使萘受热均匀,本实验还采取了其他三种方法使萘受热均匀,结合装置图说出其中一条措施:                                     
(3)加热一段时间后, 可看到烧杯中有“白气”冒出, “白气”是     (填序号)。
A.水蒸气     B.小水珠和小水滴     C、萘蒸气
(4)据上面图象可知萘熔化持续     分钟,萘是      (填“晶体”、“非晶体”)理由是                       
(5)请为这次实验设计一张合理的记录数据及现象的表格。
题型:不详难度:| 查看答案
如图是“探究某物质熔化和凝固规律”的实验图像,下列说法正确的是(     )
A.该物质凝固点是45℃
B.在BC段,该物质没有吸热所以温度不变
C.在t=2min时,该物质处于固液共存状态
D.EF段物质吸收了热量

题型:不详难度:| 查看答案
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:不详难度:| 查看答案
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