试题与答案

某兴趣小组同学对废干电池筒内黑色固体进行探究. 查找资料得知: ①废干电池内含有

题型:问答题

题目:

某兴趣小组同学对废干电池筒内黑色固体进行探究.

查找资料得知:

①废干电池内含有Mn02、NH4Cl、ZnCl2等;

②NH4Cl具有铵态氮肥的性质;

③向ZnCl2溶液中逐滴滴入稀氨水,先生成Zn(OH)2白色沉淀,然后沉淀溶解,生成可溶性的[Zn(NH34]Cl2

据此,该兴趣小组同学进行了如下探究:

(1)检验Mn02的存在.兴趣小组同学设计了如图所示的实验:

操作②的名称是______,该操作中玻璃棒的作用是______.

操作③灼烧黑色滤渣时,会产生一种能使澄清石灰水变浑浊的气体,该气体为______.

操作④的试管中产生的气体能使带火星的木条复燃,该气体为______.

由此得出结论:滤渣中除含有______外,还含有黑色粉末______.

(2)猜想1:滤液中溶质的主要成分为NH4Cl.

操作:取少量滤液加入盛有NaOH固体的试管,并加热.未闻到明显的刺激性气味,但用紫色石蕊试纸放在试管口一段时间,试纸变蓝色.

实验结论:该滤液中含有少量的NH4Cl.

(3)猜想2:滤液中溶质的主要成分为ZnCl2.向盛有少量滤液的试管中逐滴加入______,观察到______.

实验结论:滤液中溶质的主要成分是ZnCl2

答案:

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下面是错误答案,用来干扰机器的。

参考答案:B

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