试题与答案

如图,将一锌片放入1mol•L-1蓝色Cu(NO3)2溶液中,观察到下列实验现象

题型:问答题

题目:

如图,将一锌片放入1mol•L-1蓝色Cu(NO32溶液中,观察到下列实验现象:①反应初期锌片上有大量气泡冒出,同时液面的上一层Cu(NO32溶液开始呈现绿色,并且逐渐向液面下的深处扩散,试管底部有红色固体出现.②与锌片接触的溶液温度明显升高,反应越来越剧烈,并在红色固体上方开始出现一层蓝色沉淀,并逐渐增多.③反应后期溶液逐渐变为无色,试管底部又有部分白色沉淀物.

回答下列问题:

(1)反应结束时,试管底部存在的一些蓝色沉淀是什么物质______,白色沉淀可能是什么物质______,用离子方程式表示实验中观察到的红色固体产生的原因______.

(2)有学生甲认为,反应中产生的大量气泡可能是氢气,支持这种说法的理由是______.

(3)学生乙将反应过程中产生的气体用排水法收集起来,这是一种无色气体,用爆鸣法测试不能产生爆呜声,则学生甲的假设被推翻.学生乙又对这种无色气体进行推测,并设计了一个简便的实验方法证实了他的推测,写出学生乙推测出的这种气体的分子式______;验证该气体的实验方法是______.

(4)学生丙解释反应速率逐渐加快的原因时,认为除温度升高外还有一个重要因素,请问是什么因素?______.

(5)起初实验小组同学认为,溶液显绿色可能是Zn(NO32溶液的颜色,但学生丁将Zn(NO32固体溶于水后却得到无色溶液,他马上回想起该溶液的颜色与浓硝酸和铜片反应后的溶液颜色极为相似,于是他又提出了关于溶液呈绿色的一种新的假设:可能是硝酸铜溶液中溶入了一种气体,这种气体可能是______,请设计一个简单的实验验证这种假设正确与否______.

答案:

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