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工业上常通过高温分解FeSO 4 的方法制备Fe 2 O 3 ，其化学方程式为： 2FeSO 4 ='===' Fe 2 O 3 +SO 2 ↑+SO 3 ↑ 为检验FeSO 4 高温分解的产物，进行如下实验： ①取少量FeSO 4 高温分解得到的固体，加一定量稀盐酸溶解，向该溶液中加入适量的KSCN溶液，观察溶液颜色的变化以检验Fe 3+ 是否存在。 ②将FeSO 4 高温分解产生的气体通入右图所示的装置中，以检验产生的气体中是否含有SO 2 和SO 3 。请回答以下问题： （1）写出用KSCN检验Fe 3+ 的离子方程式 。 （2）装置I中试剂为氯化钡溶液，进行操作②时氯化钡溶液中有白色沉淀产生。甲同学说，这个白色沉淀可能是BaSO 4 和BaSO 3 的混合物；说，这个白色沉淀是BaSO 4 ；丙同学说，这个白色沉淀是BaSO 3 。请你设计一个简单的实验帮他们加以鉴别。 你认为上述哪一位同学的观点正确？ （3）装置II中试剂为品红溶液，其作用是 ，品红溶液中可观察到现象是 。 （4）装置III中试剂为NaOH溶液，其目的是 。
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so that he could remember them better
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because this helped him to identify his problem
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in order to keep track of them easily
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将其从“待处理财产损溢”账户转人“营业外支出”账户
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将其从“待处理财产损溢”账户转入“营业外收人”账户
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【单选题】6) The author wrote out all his options ______. A) so that he could remember them better B) because this helped him to identify his problem C) in order to keep track of them easily D) so as to find th...
A.
so that he could remember them better
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【判断题】定期清查和不定期清查都既可以是全面清查,也可以是局部清查。
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【单选题】假定某企业全部成本函数为TC=3000+5Q- , Q为产出数量。那么VC为( )
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B.
将其从“待处理财产损溢”账户转入“营业外收人”账户
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将其从“待处理财产损溢”账户转人“管理费用”账户
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【单选题】假定某企业全部成本函数为TC=3000+5Q- , Q为产出数量。那么SMC为( )
A.
5-Q
B.
5-2Q
C.
5Q-
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【单选题】The author wrote the first paragraph in an attempt to______.
A.
exemplify how severe the consequences of the Great Hanshin Earthquake are
B.
indicate that the March 11 disaster could bring out a new Japan like Great Hanshin Earthquake did
C.
make an analogy between the Great Hanshin Earthquake and the Great Tohoku Earthquake
D.
state the post-quake reconstruction is disproportionate to the damage caused by the quake
查看完整题目与答案