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【每日一题】2017.7.19 SAT2化学练习题

互联网2017-07-19 13:19:48

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摘要：本文给大家带来一道SAT2的化学题，SAT2的考生赶紧来练习，希望对大家有帮助。

If the graphic representation of the energy levels of the reactants and products in a chemical reaction looks like this:

Which of the following statements are true?

I. The activation energy for the forward reaction is represented by the “a” portion.

II. The activation energy for the forward reaction is represented by the “b” portion of the graph.

III. The “a” portion is the energy given off in the forward reaction.

(A) I only

(B) II only

(C) I and III only

(D) II and III only

(E) I, II, and III

生词:

reactant 反应物

product 产物

解析:

本图中，a是要能进行正向反应的活化能。a+b是要能进行反向反应的活化能。b是正向反应释放的能量。

因此只有I. The activation energy for the forward reaction is represented by the “a” portion 正确。答案选择(A)。

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