题干

工业上制取冰晶石的化学方程式如下:

2Al(OH)3+12HF+3Na2CO3═2Na3AlF6+3CO2↑+9H2O 根据题意完成下列填空:

(1)写出冰晶石中阳离子的结构示意图  ____ .

(2)在上述反应的反应物和生成物中,属于直线型分子的电子式为 ____ ,属于两性化合物的电离方程式 ____.

(3)反应物中某些元素处于同一周期.它们最高价氧化物对应的水化物之间发生反应的离子方程式为 ____

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答案(点此获取答案解析)

,,Al3++3OH\ufe63\u21ccAl\uff08OH\uff093 \u21ccH++AlO2\ufe63+H2O,Al\uff08OH\uff093+OH\ufe63=AlO2\ufe63+2H2

同类题1

阅读下面的文言文,完成小题。

      吴祐字季英,陈留长垣人也。父恢,为南海太守。祐年十二,随从到官。恢欲杀青简以写经书,祐谏曰:“今大人逾越五岭远在海滨其俗诚陋然旧多珍怪上为国家所疑下为权戚所望此书若成则载之兼两昔马援以薏苡①兴谤,嫌疑之间,诚先贤所慎也。”恢乃止。及年二十,丧父,居无檐石,而不受赡遗。常牧豕于长垣泽中,行吟经书。遇父故人,谓曰:“卿二千石子而自业贱事,纵子无耻,奈先君何?”祐辞谢而已,守志如初。

    后举孝廉,将行,郡中为祖道,祐共小吏雍丘黄真欢语移时,与结友而别。功曹以祐倨,请黜之。太守曰:“吴季英有知人之明,卿且勿言。”真后
亦举孝廉,除新蔡长,世称其清节。
    迁胶东侯相。祐政唯仁简,以身率物。民有争诉者,辄闭门自责,然后断其讼,以道譬之。或身到闾里,重相和解。啬夫②孙性私赋民钱,市衣以
进其父,父得而怒曰:“有君如是,何忍欺之!”促归伏罪。性惭惧,诣阁持衣自首。祐屏左右问其故,性具谈父言。祐使归谢其父,还以衣遗之。
    祐在胶东九年,迁齐相,大将军梁冀表为长史。及冀诬奏太尉李固,祐闻而请见,与冀争之,不听,冀怒而起入室,祐亦径去。冀遂出祐为河间相,
因自免归家,不复仕,躬灌园蔬,以经书教授。年九十八卒。
                                                                                    (选自《后汉书•吴祐传》,有删节)
注:①薏苡:一种禾本科植物。②啬夫:农夫。

同类题4

下面文章中有五处需要添加小标题, 请从以下选项(A、B、C、D、E和F)中选出符合各段意思的小标题, 选项中有一项是多余选项。

A.Try to be a small animal doctor

B.Help to clean our city

C.Try to give the disabled a hand

D.Make  more money

E.Visit the old people's home

F.Raise money for poor students

     There are usually some people around us who need help. So it's great to be volunteers. But what can we do? Here are some great ideas.

____

    Not every child can go to school in our country. That's because most of them are too poor to pay for their education. But if we try to raise enough money for these students, they'll be able to finish their schools and have better futures.

____

      The city is our home. However, we pollute it every day. It's time to make it cleaner and greener. We should try to pick up rubbish whenever we see it. We can even go to clean up the city streets, the city parks or the rivers near our city when we are free.

____

      They usually have many problems with their everyday life. An easy thing for a common person may be very difficult for them. Reach out your hands to help to carry their bags, take them to cross the roads. Only a little help can make them feel warm

____

      Many of them have no sons or daughters, so they need someone to spend time with. On weekends or some special days, go to see them. It's a good idea to sing or dance for them. Or just tell them small stories to make them feel less lonely.

____

      They are our friends, but some of them are in danger. We should try to protect and save them. If you are lucky to be their doctor, you'll learn more about how to care for them. And when you see them get better, you'll feel happy and proud.