题干

A﹣N是初中学过的物质.D是相对分子质量为40的氧化物,A是不溶于水和稀硝酸的白色沉淀,E是难溶于水的白色沉淀,实验室通常用N制取CO2.右下图是这些物质的转化关系,部分反应物、生成物及反应条件已省略.(注:难溶性碱加热分解生成对应的氧化物)

(1)写出化学式:A ____,N ____

(2)写出E→B的化学方程式  ____

(3)由F生成E需加入的物质是 ____

(4)C在空气中燃烧生成D的实验现象是 ____

C在空气中燃烧除了生成D之外,也可能与空气中的氮气生成氮化物(氮元素化合价为﹣3),该氮化物的化学式是 ____

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BaSO4,HCl,Mg\uff08OH\uff092+H2SO4=MgSO4+2H

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    Jenny looked at the store window. There was nothing that she wanted more than a Happy Hannah doll. It was $29.95. Unluckily, Jenny didn't even have the 95 cents.

    As she crossed the street, she thought about doing her brother's housework, cleaning the floor, washing the dishes all month, but even then she would have only eleven dollars. Suddenly, something small and pink in the snow caught her eyes.

    Jenny walked over and picked it up from the snow. It was a beautiful wallet. She opened the wallet and found many dollars and a woman's driver's license in it. Jenny put the wallet into her bag quickly. She turned around and walked back.

    Jenny's heart beat(跳动) fast as she went into the store. She had long dreamed about this moment, but something didn't feel right. As she got to the Happy Hannah dolls, she pushed away her feelings. She grabbed(抓起) one and walked toward the checkout.

    As Jenny was waiting to pay, her mobile phone rang. It was her grandma. Jenny's heart was suddenly filled with love and warmth when she thought of her. She put the doll down and answered the phone.

    “Hi, Grandma? I'm going to be a little bit late tonight...Alright...I love you, too.” Jenny left the store and walked all the way to 301 West Street. The woman who answered the door looked sad.

    “Here, I found this in the snow,” Jenny said.

    “Oh, good God! This is the money for the orphanage(孤儿院)! Thank you!”

    After doing her brother's housework for three months, Jenny finally got a Happy Hannah doll. She was so happy because she could play with her doll and look her grandma in the eye.