easy question:在化学反应A+B→C+D中,若A,B,C,D是化合物,那么这个反应是复分解反应,请给出复分解反应的精确定义,
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easy question:在化学反应A+B→C+D中,若A,B,C,D是化合物,那么这个反应是复分解反应,请给出复分解反应的精确定义,
easy question:在化学反应A+B→C+D中,若A,B,C,D是化合物,那么这个反应是复分解反应,
请给出复分解反应的精确定义,
easy question:在化学反应A+B→C+D中,若A,B,C,D是化合物,那么这个反应是复分解反应,请给出复分解反应的精确定义,
不对,复分解反应要求的是交换成分,而且不能是氧化还原反应,如果是氧化还原就不对了.
比如 H2S+3H2SO4(浓)=4SO2+4H2O
复分解反应定义:两种化合物相互交换成分,生成另外两种化合物的反应.
复分解反应的实质是:发生复分解反应的两种物质在水溶液中相互交换离子,结合成难电离的物质----沉淀、气体、水,使溶液中离子浓度降低,化学反应即向着离子浓度降低的方向进行.
[小结] 复分解反应发生的条件:
(1)、反应物:必须可溶(包括可溶入酸)
(2)、生成物:有沉淀、气体或水生成.
复分解反应发生的条件
不一定!!!
easy question:在化学反应A+B→C+D中,若A,B,C,D是化合物,那么这个反应是复分解反应,请给出复分解反应的精确定义,
It was quite an easy question.还是 It was a quite easy question.
WHY WE HERE?WHAT IS SOUL?A EASY QUESTION
it ensn't a easy question什么意思
n easy question~
The question is______to answer.A.too easy B.easy enough为什么?
The question is not easy.的同义句() a () question.这也特快了
This question isn't easy.It's very____________ A.difficult B.difficulty C.easy D.not easy
21.I found the last question ____ .A.to be easy B.the easy C.that it was easy D.easy应该选什么,为什么?
The,question,is,easy,to,
as引导的定语从句Here is so easy a question as everybody can answer.书上说,as在从句中做结果状语,应该是原因状语吧
This question is( )for him to answer A: easy enough B: easily enough C: enough easily D:enough easy
The question is easy.( )can answer it.A.Someone B.Anyone
The question is not easy.It’s very ______.A.not difficult B.difficulty C.difficult
The question is not easy.It's very _______.A.difficult B.interestingC.relaxing D.good
It is a d____(not easy) question ,I can‘t answer it.
This question is [] for me to answer.A.too easyB.easy enough.填空,快
The question is _________ for me to understand.A easy enough B difficult enough