设有两个化学反应 A 和 B ,其反应的活化能分别为 EA 和 EB ,而且EA > EB ,若反应温度变化情况相同(由T1→T2),则反应的速率常数kA和kB 的变化情况为
A. kA改变的倍数大
B. kB改变的倍数大
C. kA和 kB 改变的倍数相同
D. kA和 kB 均不改变
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对于符合阿伦尼乌斯方程的反应来说,下列说法中正确的是
A. 反应速率常数的大小即反应速率的大小
B. 反应级数和反应分子数是同义词
C. 反应级数越大,反应速率越大
D. 从反应的速率常数的单位可以推测该反应的反应级数
E. 放热反应的速率总比吸热反应的速率大
F. 升高温度时,无论放热反应或吸热反应速率都是增大的
G. 催化剂只能缩短反应达到平衡的时间而不能改变平衡状态或者平衡常数
为什么有些反应的活化能很接近,反应速率却相差很大;有些反应的活化能相差较大,而反应速率却很接近?
Complete the following sentences with the words given below. Change the form where necessary. (Unit 1, Text A)assurebiaseddreadgrinhoverscrawlvisible1. He me that the well-known doctor would cure my headache.2. I wish you’d stop round and let me get on with some work.3. Hilary was out, so I a note to her and put it under the door.4. In the room where the young man was killed, detectives found no signs of a struggle.5. One member of the jury was in favour of the suspect, because they shared the same educational background.
Choose the definitions from Column B that best matches each phrasal verb in Column A, paying attention to the v.+prep./ad. Collocation. (Unit 1, Text A & Text B)