问题 选择题

在某一化学反应,0.5L的密闭容器中,反应物B的物质的量在5s内从2.0mol变成0.5mol,在这5s内B的化学反应速率为(  )

A.3mol/(L•s)  

B.0.3mol/(L•s)

C.0.6mol/(L•s)

D.0.1mol/(L•s)

答案

答案:C

反应速率通常用单位时间内浓度的变化量来表示,所以物质B的反应速率是

,答案选C。

阅读理解

阅读理解。

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问答题

本题为必选题,请在Ⅰ、Ⅱ两道试题中任选一题作答。
Ⅰ.阅读下述案例,请用学生的自我价值导向来分析。
小伟和小朝在初中时,学习成绩不相上下,共同以优异的成绩考入了某重点高中。第一次期中考试后,小伟的成绩很不理想,当别人问起来,他说:“我一直没在意这次考试,只是昨天才随便复习了一下功课,连笔记都还没来得及看。”小朝在这次考试中的成绩也不好,他回应说:“我这次也没有考好,不过我下次肯定能考好,我一定能行。”于是,在接下来的学习中,小伟总是担心自己会再次考不好,而小朝却一门心思努力学习,对自己充满信心,要迎头赶上。在期末考试中,小伟又没考好,他说:“我这次考试太焦虑了,好多东西其实我都知道的,但是在考场上就是想不起来。”这次小朝的成绩考得很好,他说:“小伟,只要你努力,下次我们能一起考得更好,我们一起加油。”在第二学期开学后的几次考试中,伟的成绩一次不如一次,渐渐地他觉得自己根本就无法考出好成绩,不论自己怎么努力都是没用的,自己是学不好了的。后来,干脆就不学习了。而小朝却是一次比一次考得好,对学习依然充满热情。
Ⅱ.分析下述研究设计,按要求回答问题。
一项名为“初中语文独立学习实验”的研究,选择了某市一所普通中学的初二(4)班为实验班,初二(7)班为控制班,两班教师水平相当,所用教材相同,图书资源、实验设备、计算机房也都是公用的。在实验班采用弹性模块式时间表,上课时间划分为大班教学(占40%)、小组讨论(占40%)和独立学习(占20%),三者之间的组合是可以变的。控制班则采用传统的大班上课,老师讲授学生听的方法。实验周期为一个学期,根据实验前后两班学生的测试成绩的差异比较,来判断独立学习是否有效。
(1) 请写出该实验设计类型的名称和格式。
(2) 该实验控制无关变量的主要措施是什么
(3) 该实验设计的优点和局限性有哪些