《2025年三维随堂精练高中化学必修第二册人教版》

15.某化学小组为了研究外界条件对化学反应速率的影响，进行了如下实验：
[实验原理]$2\text{KMnO}_{4} + 5\text{H}_{2}\text{C}_{2}\text{O}_{4} + 3\text{H}_{2}\text{SO}_{4}\xlongequal{}\text{K}_{2}\text{SO}_{4} + 2\text{MnSO}_{4} + 10\text{CO}_{2}\uparrow + 8\text{H}_{2}\text{O}$
[实验内容及记录]

请回答下列问题：
(1)根据上表中的实验数据，可以得到的结论是____________________。
(2)利用实验1中数据计算，$v(\text{KMnO}_{4}) = $____________________。
(3)该化学小组同学根据经验绘制了$n(\text{Mn}^{2 + })$随时间变化趋势的示意图，如图甲所示。但有同学查阅已有的实验资料发现，该实验过程中$n(\text{Mn}^{2 + })$随时间变化的趋势应如图乙所示。该小组同学根据图乙所示信息提出了新的假设，并继续进行实验探究。

①该小组同学提出的假设是____________________。
②请你帮助该小组同学补全实验方案，并填写表中空白。

③若该小组同学提出的假设成立，应观察到的现象是____________________。

答案： 答案 （1）其他条件相同时，增大KMnO₄溶液浓度(或反应物浓度)，反应速率增大 （2）1.5×10⁻² mol·L⁻¹·min⁻¹ （3）①生成物中的MnSO₄为该反应的催化剂(或Mn²⁺对该反应有催化作用) ②MnSO₄ ③与实验1比较，溶液褪色所需时间更短[或所用时间(t)小于4.0 min及其他合理答案]

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答案： 微判断：1.× 2.× 3.√ 4.× 5.× 6.√ 7.√ 8.√ 9.× 10.√ 11.× 12.×

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答案： 微训练：1.B 2.C