作者alankuo (脚踏车+翅膀=飞翔的梦想)
看板TransBioChem
标题[化学] 请教几题97年北科的题目
时间Fri Jul 3 13:11:07 2009
我想请问一下有谁知道以下的答案啊
Applying with thermodynamics, what is the cannot determine?
（A.）The direction of a spontaneous reaction.
（B.）The extent of a reaction.
（C.）The value of the equilibrium constant.
（D.）The speed of a reaction.
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When the system is at equilibrium for the gas phase reaction at 300℃ :
N2 + 3H2←→NH3 , and the equilibrium constant(Keq) is 4.34*10^-3 .
Which description below for the reaction is correct?
（A.）Only products are present.
（B.）Only reactants are present.
（C.）Reactants predominate.
（D.）Roughly equal amounts of products and reactants are present.
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Natural, unpolluted is typically acidic. Which one is the source of
this acidity?
（A.）HCl
（B.）CO2
（C.）SO3
（D.）NO2
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1F：推 za7550295566:第一题 我是选D 第二题 C D好像都感觉是对的.. 07/03 23:41
2F：推 za7550295566:更正一下 第二题 c选项 成立在 知道起始浓度 07/04 09:41
3F：→ za7550295566:如果Q>Keq 则反应物 Q<Keq则产物 07/04 09:42