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【提出问题】小明同学在实验室发现一瓶没有标签的橙色液体，出于好奇，他用一只洁净的试管取了约2 mL氢氧化钠溶液，然后滴加了几滴该橙色液体，结果溶液变黄色。小明想，为什么溶液会发生颜色变化呢？ 【建立假设】小明想，这种物质可能是一种酸碱指示剂。 （1）【收集证据】一般情况下，能在酸或碱溶液中显示不同颜色的物质，可作酸碱指示剂。请你设计一个简单的探究方案，证明小明的猜想。 实验操作方法和过程 观察到的现象 （2）【得出结论】根据实验现象，你的结论是 ； （3）【交流与反思】通过以上探究活动，你得到的启示是 。
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举一反三
【单选题】Which of the following does NOT make bar graphs easier to read?
A.
Utilizing titles that summarize the basic message
B.
Utilizing 3-D bars
C.
Utilizing 2-D bars
D.
Using differing shades of gray or colors to represent different variables
【简答题】reading text A and text B, try to summarize what are the 3 basic principles people observe in western public places?
【简答题】I. What is the author trying to tell his readers? How would you summarize his ideas? (30分) II. What are the other basic human needs that the author says can be a counterforce to power?(30分) III. Give ...
【多选题】In developing information about the activities of a business, every accounting system performs the following basic functions:
A.
Figure out the nature of economic activities that accounting information describes
B.
Interpret and record the effects of business transactions.
C.
Classify the effects of similar transactions in a manner that permits determination of the various totals and subtotals useful to management and used in accounting reports.
D.
Summarize and communicate the information contained in the system to decision makers.
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