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【简答题】
(15分)某同学在学习了氨的性质以后，运用类比的思想思考：（1）其他气体在一定情况下能否像氨气一样也形成喷泉？（2）氨气具有还原性，能否像H 2 那样还原CuO呢？于是他设计实验制取氨气并探究上述问题。请你参与他的活动并完成下列研究： （Ⅰ）制取氨气及喷泉现象的探究 1.写出实验制取氨气的化学方程式 ； 2.收集氨气的方法是 。 3.喷泉是一种常见的自然现象。 （1）图1为化学教材中的喷泉实验装置。该生积极思考，只要满足烧瓶内压强与玻璃管水柱压强的和小于烧瓶外的压强就可以产生喷泉。于是他设计了图2和图3所示的装置。 ①在图2的锥形瓶中，分别加入足量的下列物质，反应后可能产生喷泉的是__________。 A.Cu和稀盐酸 B.NaHCO 3 与NaOH溶液 C.MnO 2 与稀盐酸 D.Na 2 CO 3 与稀盐酸 ②在图3锥形瓶中加入易挥发物质（如酒精），水槽中加入冷水后，再加入下列的物质足量，结果也产生了喷泉。水槽中后加入的物质可以是___________。 A.浓硫酸 B.食盐 C.生石灰 D.蔗糖 （2）城市中常见的人造喷泉及火山爆发的原理与上述___________（从“图1”或“图2”中选择）装置的原理相似。 （Ⅱ）该小组中某同学设计了下列所示的实验 装置（夹持及尾气处理装置未画出），探究氨气 的还原性： B C A （1）该装置在设计上有一定缺陷，为保证实验结果的准确性，对该装置的改进措施是 。（2）利用改进后的装置进行实验，观察到CuO变为红色物质，无水CuSO 4 变蓝色，同时生成一种无污染的气体。写出氨气与CuO反应的化学方程式 。
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举一反三
【单选题】The reason why these men committed suicide is that ______.
A.
they felt they dishonored the family name
B.
they couldn't find gainful employment because of their age after losing their job
C.
they were afraid of being old
D.
Both A and B.
【单选题】Olive oil prepared in a small Italian oil press factory and sold by large supermarkets in the United States is an example of a ________.
A.
net national product
B.
U.S. export
C.
U.S. import
D.
gross domestic product
【单选题】He felt it strange ______ she would be late for class.
A.
that
B.
which
C.
when
D.
why
【单选题】Why did the professor study the Brazilian students' behavior?
A.
He felt puzzled at the students' being late.
B.
He felt angry at the students' rudeness.
C.
He wanted to make the students come on time later.
D.
He wanted to collect data for one of his studies.
【简答题】(explore) Domestic oil ________ and gasoline prices are emerging as important issues in the presidential campaign.
【单选题】The reason _______ he felt frustrated was ______ he lost his MP4.
A.
why/that
B.
that/why
C.
why/because
D.
that / because
【单选题】It is helpful to illustrate these points by looking at the case of the United States, precisely because 3.__________. Coal, copper, iron, silver, and nickel are just a few of the natural resources the...
A.
countries need to - or choose to import at least some goods and services
B.
different countries have comparative advantages on different products
C.
exports are also more than just an outlet for “ excess ” production
D.
it has the capability of producing the goods or supplying the services
E.
it comes closer to being self-sufficient than most other countries
F.
sell goods or services to other countries at prices higher than the prices
【单选题】以下关于窗体的描述中,错误的是(
A.
执行Unload Forml语句后,窗体Forml消失,但仍在内存中
B.
窗体的Load事件在加载窗体时发生
C.
当窗体的Enabled属性为False时通过鼠标和键盘对窗体的操作都被禁止
D.
窗体的Height、Width属性用于设置窗体的高和宽
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