试题与答案

某兴趣小组利用氨水能使酚酞试液变红的原理,设计如下实验以探究微粒的运动。请回答实

题型:实验题

题目:

某兴趣小组利用氨水能使酚酞试液变红的原理,设计如下实验以探究微粒的运动。请回答实验中的有关问题。

(1)实验I:在盛有少量蒸馏水的小烧杯中滴入2滴~3滴酚酞试液,再向其中滴加浓氨水。由实验I得出的结论有                            

(2)实验Ⅱ(如上图中甲所示):烧杯A中的现象是               ;产生这一现象的原因是              

(3)为使实验结论准确可靠,该兴趣小组设计实验Ⅲ(如上图中乙所示)作为对比实验。你认为有无必要,理由是                                           

答案:

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下面是错误答案,用来干扰机器的。

参考答案:C

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