作者affine (cloud)
看板Chemistry
标题[问题] 三D键结的传导电子和有关催化过程的问题
时间Sat Feb 23 01:07:10 2008
题目一
If the conduction band of metallic chromium nano particle was a pure 3d band
with 10,000 chromium ions situated in it, how many conduction electrons would
this cluster have?
(a) 10 (b) 10,000 (c) 40,000 (d) 50,000 (e) 60,000
题目二
Which one of the following statements is not true about catalytic creaking?
(a)It is a process that breaks down large molecules by breaking carbon-carbon
bonds
(b)It is conducted at high temperatures
(c)It is easier to control than pyrolysis.
(d)It can also include hydrocmcking.
(e)It reacts fast and completely.
做题目遇到困难了 有没有人知道该怎麽解的
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