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> 下列现象能证明空气中有水的是()A.打开热水瓶盖,瓶口出现白雾B.白色硫酸铜粉末敞口放置在空气中变蓝C.人对着镜子哈气,镜子表面起雾D.蜡烛火焰上罩一干冷烧杯,烧杯内壁出现-物理
下列现象能证明空气中有水的是()A.打开热水瓶盖,瓶口出现白雾B.白色硫酸铜粉末敞口放置在空气中变蓝C.人对着镜子哈气,镜子表面起雾D.蜡烛火焰上罩一干冷烧杯,烧杯内壁出现-物理
题目简介
下列现象能证明空气中有水的是()A.打开热水瓶盖,瓶口出现白雾B.白色硫酸铜粉末敞口放置在空气中变蓝C.人对着镜子哈气,镜子表面起雾D.蜡烛火焰上罩一干冷烧杯,烧杯内壁出现-物理
题目详情
下列现象能证明空气中有水的是( )
A.打开热水瓶盖,瓶口出现白雾
B.白色硫酸铜粉末敞口放置在空气中变蓝
C.人对着镜子哈气,镜子表面起雾
D.蜡烛火焰上罩一干冷烧杯,烧杯内壁出现水珠
题型:单选题
难度:中档
来源:嘉兴
答案
A、热水瓶口出现白雾,是由于热水瓶内由大量的水蒸气,水蒸气上升到空中越冷液化形成,不能证明空气中有水;
B、硫酸铜粉末是白色的,硫酸铜溶液是蓝色的,白色硫酸铜粉末变蓝是因为空气中的水蒸气遇冷液化形成水,被硫酸铜粉末吸收,所以它可以证明空气中有水;
C、人对着镜子哈气,人口中的水蒸气越到比较冷的镜子会液化形成雾,不能证明空气中有水;
D、蜡烛在燃烧时就会产生水蒸气,水蒸气遇到干冷的烧杯就会液化形成水珠,它也不能证明空气中有水.
故选B.
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题目简介
下列现象能证明空气中有水的是()A.打开热水瓶盖,瓶口出现白雾B.白色硫酸铜粉末敞口放置在空气中变蓝C.人对着镜子哈气,镜子表面起雾D.蜡烛火焰上罩一干冷烧杯,烧杯内壁出现-物理
题目详情
答案
B、硫酸铜粉末是白色的,硫酸铜溶液是蓝色的,白色硫酸铜粉末变蓝是因为空气中的水蒸气遇冷液化形成水,被硫酸铜粉末吸收,所以它可以证明空气中有水;
C、人对着镜子哈气,人口中的水蒸气越到比较冷的镜子会液化形成雾,不能证明空气中有水;
D、蜡烛在燃烧时就会产生水蒸气,水蒸气遇到干冷的烧杯就会液化形成水珠,它也不能证明空气中有水.
故选B.