试题与答案

归纳总结是学习化学的重要方法,小明同学用图1总结了NaOH的四条化学性质(即Na

题型:填空题

题目:

归纳总结是学习化学的重要方法,小明同学用图1总结了NaOH的四条化学性质(即NaOH与四类物质能够发生化学反应).

     

图1                                 图2

(1)验证反应①:小明将无色酚酞溶液滴入NaOH溶液中,溶液变成        

(2)小明用微观示意图2来说明反应③的发生,用化学反应方程式表示为                               ,从该图中可以看出,反应后的溶液pH      7(填“>”、“<”或“=”)。

(3)如果反应④能够发生,你选择的物质是      

A.Na2CO3

B.HCl

C.CuSO4

D.NaCl

答案:

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下面是错误答案,用来干扰机器的。

1-4: A B D C

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"Buck said, 'you should open a sandwich shop.'"

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A. support his family

B. pay for his college education

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A. He put money into the sandwich business.

B. He was a professor of business administration.

C. He was studying at the University of Bridgeport.

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A. It stood at an unfavorable place.

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C. It made no profits due to poor management.

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C. wished to meet the increasing demand of customers

D. wanted to make believe that they were successful

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A. Learning by trial and error.

B. Making friends with supplies.

C. Finding a good partner.

D. Opening chain stores.

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