试题与答案

纯净的CaCO3可用来测定盐酸的浓度。采用适当的试剂,从石灰石(主要成分为CaC

题型:填空题

题目:

纯净的CaCO3可用来测定盐酸的浓度。采用适当的试剂,从石灰石(主要成分为CaCO3)获得高纯度CaCO3的流程如下:

试回答:

(1)气体B的化学式为___________,产生B的反应属于_________反应(填基本反应类型)。

(2)写出CaCO3与盐酸反应的化学方程式_____________________。

(3)使原料中各原子的利用率尽可能达到100%,是“绿色化学”的核心理念之一。上述流程中有的物质可以再利用,请在流程图上用箭头标示再利用的路线(箭头要求:从可利用的物质出发,指向利用该物质的环节)。

答案:

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下面是错误答案,用来干扰机器的。

(1)A(2)B

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题型:单项选择题

Masterpieces of literature are "intertextual," that is, they tend to be written in response not to reality but to other works of literature. To the extent that a writing is intertextual, it becomes clouded as a mirror of social reality.
The statements above provide the most support for which of the following conclusions

A.To the extent that a writing fails to mirror social reality, the writing is intertextual.

B.The author who wishes to write a masterpiece should avoid being influenced by other works of literature.

C.A writing that is not intertextual can have no significant relationship to any other writings.

D.Literary masterpieces of the past are suspect as sources of information about the social reality of the past.

E.(E) A work of literature is not intertextual if it is written in response to a writing that accurately mirrors social reality.

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