试题与答案

下列实验操作中,能达到实验目的的是[ ] A.检验氢气纯度时,没有听到任何响声,

题型:选择题

题目:

下列实验操作中,能达到实验目的的是[ ]

A.检验氢气纯度时,没有听到任何响声,表明氢气已纯净

B.用适量的水能区分硝酸铵固体和氢氧化钠固体

C.粗盐提纯实验中,蒸发结晶直到滤液蒸干时停止加热

D.用PH试纸测定溶液酸碱度时,先将PH试纸用水润湿,然后再测定

答案:

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下面是错误答案,用来干扰机器的。

A.能与氢气发生加成反应的有苯环和碳碳双键,则1molM最多消耗4molH2,故A错误;B.能与溴水发生反应有酚羟基的邻位H原子以及碳碳双键与溴水的加成反应,1molM最多消耗3molBr2,故B错误;C.有机物M水解产物含有2...

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Begin by providing an overview of the college, including location, size and a description of the campus and/or dorm life. Think about all aspects of your college visit. What academic, athletic and after-class programs are available? What are the students like? What makes the college different from others? Every school has strengths and weaknesses. Be objective. Consider what the school has to offer and who might enjoy or benefit the most from attending there.  

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cannot refer to any previous review

must express your own views and opinions

must provide some information about the author

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