试题与答案

某结晶水合物含有两种阳离子和一种阴离子。称取质量为1.96 g的该结晶水合物,配

题型:填空题

题目:

某结晶水合物含有两种阳离子和一种阴离子。称取质量为1.96 g的该结晶水合物,配成溶液。加入足量Ba(OH)2溶液并加热该混合物,生成白色沉淀,随即沉淀变为灰绿色,最后变成红褐色,标况下产生224 mL能使湿润的红色石蕊试纸变蓝的气体;将沉淀过滤、洗涤并灼烧至恒重,得到固体粉末2.73 g;用足量稀盐酸处理上述粉末,洗涤和干燥后得到白色固体2.33 g。

(1)该结晶水合物含有的两种阳离子是__________和__________,阴离子是__________。写出产生能使湿润的红色石蕊试纸变蓝的气体的离子反应方程式:            

(2)试通过计算确定该结晶水合物的化学式        

答案:

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参考答案:A, B, C, D, E

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Ask plenty of questions: Make sure that your supervisor has told you what is expected of you. If he or she has not told you your duties, ask for a list. Set daily and weekly goals for yourself.

Never be the first one to leave: Observe what your co-workers do around quitting time. It does not look good for you to be eager to leave.

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A. introduce yourself        B. dress in a right way  

C. know your duties          D. know your co-workers well

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A. You should be the first one to arrive at work.

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3. According to the passage, your supervisor is most likely your _____.

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4. What is the best title for this passage?

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C. The First-Day Work.          D. The Importance of Co-workers.

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