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【精选】八年级物理上升华和凝华同步练习题-物理知识点总结

高中数学、数学课件、高中数学教案、数学试卷试题、数学知识点总结 八年级物理《升华和凝华》同步练习题 【同步达纲练习】 1.烧瓶里放少量的碘当对烧瓶微微加热时,观察到碘没有 ,而是直接 ,停止加 热,碘蒸气没有 ,而是直接 . 2.在物态变化中,天空中的云是水蒸气 成的小水滴和水蒸气 成的小冰晶 组成的. 3.在发掘文物的活动中,文物工作者几乎从未发现古代的珍珠,这可能是因为 . 4.在箱子里放卫生球用来防虫蛀,过几个月后,卫生球变小或消失了,这一物理现象是:( ) A 升华 B.汽化 C.蒸发 D.熔化 5.冬天早晨看到霜,是空气中的水蒸气( ) A.凝固而成的 B.凝华而成的 C.液化而成的 D.先液化,后凝固而成的 6.关于雨、露、霜、雾跟物态变化的关系,下面说法中正确的是:( ) A 雨水是水的液化形成的 B.露水是水的汽化形成的 C.霜是水蒸气凝华形成的 D.雾是水蒸气凝华形成的 【知识验证实验】 用久了的日光灯管两端会发黑,这是什么原因? 参考答案: 【同步达纲练习】 1.变成液态 变成气态 变成液态 变成固态 2.液化 凝华 3.珍珠易升华 【知识验证实验】 这是灯丝升华成气态,后又凝华成固体粉末,尘积在灯管上形成的. 4-6.A B C 高中数学、数学课件、高中数学教案、数学试卷试题、数学知识点总结

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