题干

氨对工业级国防具有重要意义,如图为鲁能中学化学学习小组同学模拟工业合成氨原理设计如图1实验.

查阅资料:碱石灰,是CaO和NaOH的固体混合物,可以吸收水蒸气.

完成以下实验中相关问题:

①检查装置气密性.

②关闭ac,打开b,从长颈漏斗中加入稀盐酸,A中发生反应生成氢气的化学方程式为____,在E出口处收集H2并验纯.

③关闭a、b、c在盛满空气的多孔玻璃钟罩内用激光点燃足量白磷,此操作的目的是____

④待多孔玻璃钟罩冷却到室温,先打开a,再加热D处的酒精灯,最后打开止水夹____,H2、N2在催化剂的作用下生成NH3,该反应的化学方程式为____.实验过程中C装置的作用是____,E装置的现象为____,此现象说明NH3溶于水后溶液呈____性.

⑤实验室用固体Ca(OH)2和固体NH4Cl混合在加热条件下制NH3,应选用如图2哪个装置____(填“A”或“B”),该反应的化学方程式为____

上一题 下一题 0.0难度 选择题 更新时间:2013-07-26 05:04:09

答案(点此获取答案解析)

Zn+2HCl=ZnCl2+H2\u2191,\u9664\u53bb\u7a7a\u6c14\u4e2d\u7684\u6c27\u6c14\u5f97\u5230\u8f83\u7eaf\u51c0\u7684\u6c2e\u6c14,c,N2+3H2

同类题1

阅读下面短文,从每篇短文后所给各题的四个选项(A、B、C和D)中,选出最佳选项。

    Outside her cottage, old Mrs. Taylor was hanging out laundry on a wire line, unaware that some children were hiding in a nearby tree watching her every move. They were determined to find out if she really was a witch.(女巫)

    They watched nervously as she took a broomstick(长柄扫帚)to sweep the dirt from her stone steps. But much to their disappointment, she didn't get on the broomstick and fly off. The old lady only looked up when her hen began to make sounds loudly —signaling that she had laid an egg in the nest on the top of the haystack.(干草堆).

    The old lady put aside her broomstick and walked to the haystack, followed by Michael, a black cat she had rescued from a fox trap. With only three legs, it was hard for Michael to keep up with his mistress. The cat was proof for the children that only a witch would own a black cat with three legs! Crawling further along the branches, they could clearly see the haystack.

Mrs. Taylor was standing on a wooden box with the new-laid egg in one hand. Placing the egg in her pocket, she readied herself to climb down. Then, without warning, the box broke under her and she crashed to the ground. The children were in horror.

“Should we go and help her?” asked Mia.

    “What if it's a trick?” replied Patrick. “She probably knows we're here. Witches know things like that!”

After thinking for a while, Julia said “Anyway, we should go and check whether she is all right.”

Approaching prudently, they could see a wound on the old lady's forehead. She had knocked her head on a stone and was unconscious.

“Go and get Dad,” Mia yelled to her brothers. “Tell him about the accident.”

The boys didn't need another excuse to leave. They ran as fast as they could for help, hoping that Mrs. Taylor would not regain consciousness and turn the girls into frogs.

    Later, in the hospital, the old lady smiled her thanks. “I was so lucky that you lovely children happened to be passing when 1 fell. I must have yelled quite loudly.”

    The children exchanged guilty glances, but were very pleased that she was not a witch after all!