问题 问答题

实验室常用分解过氧化氢溶液(二氧化锰作催化剂)的方法制氧气(如图):

(1)请写出该反应的化学方程式:______

(2)请分析该装置中带有活塞的分液漏斗的作用:______

(3)若将装置中的分液漏斗改成长颈漏斗,则长颈漏斗必须______.

(4)利用该装置还可以制备的一种气体是______.

答案

(1)该反应的化学方程式:2H2O2

 MnO2 
.
 
2H2O+O2↑,不要漏掉条件和气体符号;

(2)该装置中带有活塞的分液漏斗的作用:控制液体滴加的速度,从而控制反应速度.

(3)若将装置中的分液漏斗改成长颈漏斗,则长颈漏斗必须插入液面以下,防止气体从长颈漏斗中逸出.

(4)根据该发生装置的特点,当反应物的状态为固体和液体都可用此装置作为发生装置,比如说用大理石或石灰石和稀盐酸来制取二氧化碳、用锌和稀硫酸来制取氢气等.

故答案为:(1)2H2O2

 MnO2 
.
 
2H2O+O2

(2)控制液体滴加的速度,从而控制反应速度.

(3)插入液面以下

(4)氢气(或二氧化碳)

判断题
单项选择题

To be a good friend, you have to give of yourself, nonetheless not so much that you lose yourself. This is a pretty predictable recipe for happiness. Giving to others—a reliable way of fostering friendships—makes us happier than taking things for ourselves. In the light of research led by Dr. Elizabeth Dunn at the University of British Columbia, money can purchase happiness...on the prerequisite that you utilize it on other people.

Researchers administered three studies consecutively. First, they surveyed more than 600 Americans and found that spending money on gifts and charities led to greater happiness than spending money on oneself.

Subsequently they probed into workers who had just received bonuses and observed that their happiness did not hinge on the size of their bonus but on the decision they made about what to do with whatever amount of money they received. Those who spent more of their bonus on others were happier than those who spent the money on themselves.

Finally, the researchers simply distributed money to a good many subjects, instructing some to spend the money on themselves and others to spend the money on others. At the end of the day, the ones who spent money on others were a good deal happier.

As a consequence, having friends and treating them generously is clearly a winning strategy in life. But what about in business

If you watch even a single episode of any reality TV show based on a competition, such as The Apprentice, you’ll hear a single phrase crop up more often than any other: "I’m not here to make friends!" Is that true Are we better off being cutthroat than collaborative

Once you’re on the job, having a best friend at work is a p predictor of ensuing success. People might define "best" loosely (think of this as kindergarten where you can have more than one "best" friend), but according to a Gallup Organization study of more than 5 million workers over 35, 56% of the people who say they have a best friend at work are engaged, productive, and successful while only 8% of the ones who don’t are.

Another remarkable study, spanning decades, revealed that friendships in high school were an effective predictor of increased wages in adulthood—to the tune of 2% per person who considered you a close friend. To put it otherwise, if in high school three people regarded you as one of their closest same-sex friends, your earnings in adulthood work would be 6% higher.

The happy truth is that the competitors who say they’re not here to make friends don’t win eventually. That’s true for reality TV, for business, and for life as well.

According to the passage, it would be better for high-school students to()

A. make more close friends

B. learn to give of themselves

C. work more often in collaboration with other students

D. have a plan to gain a high paid job after graduation