
第八章 8.2 汽化与液化
Authored by Tan Jia Sin
Science
7th Grade
Used 20+ times

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14 questions
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1.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
物质由液态变成气态的过程是_____,由气态变成液态的过程是_____。
液化;汽化
汽化;凝华
汽化;液化
凝聚;升华
2.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
在卫生间沐浴后发现墙上的镜子变模糊了,过一段时间后镜子又恢复了明净。在镜面上所发生的物质状态变化是
先汽化后液化。
先液化后汽化。
先凝固后汽化。
先液化后升华。
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
洗过头发后用吹风机吹可以使头发干得快些,吹风机的作用是
I. 提高温度
II. 增大液体与空气的接触面
III. 增大液面气体流动的速度
I
I 和 II
I 和 III
I, II 和 III
4.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
护士在病人的手臂上涂上酒精时,病人会觉得些许凉凉,因为
酒精蒸发时,向四周释放热量。
酒精蒸发时,从四周吸收热量。
酒精沸腾时,从四周吸收热量。
酒精沸腾时,从四周释放热量。
5.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
很多公共场所的卫生间都有热风干手器,洗手后用它可以很快把手烘干,它能很快烘干手的理由是
I. 热风提高手上水份的温度
II. 吹出的风加快手表面空气的流动
III. 吹出的风增大水份的表面积
I 和 II
II 和 III
I 和 III
I, II 和 III
6.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
医生为病人检查牙齿时,拿一个小镜子在酒精灯上微微烤一烤,然后放入病人的口腔内,这样做的目的是
防止细菌感染
防止口腔内热的水蒸气在镜片上遇冷液化
防止镜片沾到污渍
以上都不是
7.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
工厂把甲烷等可燃气体装进打火机,是利用 进行液化。
降低温度
吸收热能
压缩甲烷气体的体积
释放热能
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