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【简答题】
某化学兴趣小组在学习金属活动性顺序后，对金属钠能否像铁一样把铜从硫酸铜溶液中置换出来产生了兴趣，并进行了一下探究： 【提出问题】钠与硫酸铜溶液反应后的产物中是否有铜？ 【查阅资料】①钠能与冷水剧烈反应，放出大量热。化学方程式为： 2Na+2H 2 O==2NaOH+H 2 ↑ ②难溶性碱通常会分解，如：Cu（OH） 2 CuO+H 2 O。 【分析讨论】经讨论，大家认为钠可能会先与水反应生成氢氧化钠和氢气，氢氧化钠再与硫酸铜反应生成氢氧化铜。但也有可能钠直接与硫酸铜反应而生成铜。 【提出猜想】小组同学对钠与硫酸铜溶液反应的产物作出如下猜想： 猜想1：有Cu（OH） 2 和H 2 ，无Cu; 猜想2：有，无Cu（OH） 2 和H 2 ； 猜想3：既有Cu（OH） 2 和H 2 ，又有Cu。 Ⅰ【探究实验一】 【反思质疑】有同学认为未能得到铜可能是CuSO 4 溶液浓度太小的缘故，并为此作了进一步的实验探究。 Ⅱ【探究实验二】 【拓展分析】金属钠不能将铜等金属从其盐溶液中置换出来。
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举一反三
【单选题】Working in a gallery is interesting (because/ because of) the wide variety of customers.
A.
because
B.
because of
【简答题】生精小管变为直精小管的部位是A. 近睾丸纵隔处
【单选题】Given that Monika's income exceeds her expenditures, Monika is best described as a
A.
a.saver or as a supplier of funds.
B.
b.saver or as a demander of funds.
C.
c.borrower or as a supplier of funds.
D.
d.borrower or as a demander of funds.
【单选题】Monika's Dinor is operating at 94 percent of its fixed asset capacity and has current sales of $611,000. How much sales can the firm grow to before any new fixed assets are needed?
A.
$590,000
B.
$750,000
C.
$780,000
D.
$650,000
【单选题】Given that Monika's income exceeds her expenditures, Monika is best described as a
A.
saver or as a supplier of funds.
B.
saver or as a demander of funds.
C.
borrower or as a supplier of funds.
D.
borrower or as a demander of funds.
【单选题】Which of the following statements is True according to the passage?
A.
It is better to compare a youngster to his brighter brothers because it makes him try harder.
B.
Parents prefer to let their children be in charge of their own lives at an early age.
C.
Children shouldn't be corrected because it destroys their self-esteem.
D.
Children learn much by seeing what their parents do.
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