问题 问答题

写出下列反应的化学方程式:

(1)过氧化钠与二氧化碳:______.

(2)二氧化硫与氧气:______.

(3)铜与浓硫酸:______(标出电子转移的方向和数目).

答案

(1)过氧化钠与二氧化碳反应生成碳酸钠和氧气,即2Na2O2+2CO2=2Na2CO3+O2

故答案为:2Na2O2+2CO2=2Na2CO3+O2

(2)二氧化硫加热并在有V2O5作催化剂的条件下可以与氧气发生反应生成三氧化硫,反应的方程式是:2SO2+O2

V2O5
.
2SO3

故答为:2SO2+O2

V2O5
.
2SO3

(3)铜和热的浓硫酸反应生成二氧化硫、硫酸铜和水,铜的化合价升高2价失去两个电子,硫酸中硫的化合价降低2价得到两个电子,则,故答案为:

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Good evening, ladies and gentlemen. The lead story in tonight’s news concerns the fire which destroyed the major part of Columbia College at 4 a.m. this morning. In only five minutes, more than six hundred girls came out of their dorms to watch their college burn to the ground in the freezing December weather. Fortunately, there were no injuries resulting from the fire. According to the college president, plans are already made to raise more than three million dollars to rebuild the college.

Here is the news from Washington. President Clinton says he is troubled by a scientist’s desire to clone a human and is urging Congress to pass a ban (禁令) on such experiments for at least five years. In his weekly radio address, Clinton noted Chicago-area physicist Richard Seed’s announcement that he is ready to set up a clinic to clone human babies. President Clinton said that the need for passing laws that would ban human cloning for at least five years is more urgent than ever.

A brief look at the weather for the weekend tells us to expect light showers on Saturday and Sunday. The high Saturday will be in the lower 40’s. On Sunday, we can expect the high to be about 65. That’s this evening’s news. Good night from Channel 9 news. Your better news station, and from Alan King, your reporter.

1. When did the fire at Columbia College take place?

A. In December.                        B. In March. 

C. In November.                        D. In April.

2. What does President Clinton hope Congress do?

A. To pass a ban on doing experiment in labs. 

B. To ban cloning humans forever.     

C. To pass laws to support cloning babies.

D. To pass a ban on human cloning quickly.

3. What will the weather be like on weekend?

A. There will be a strong wind.           B. The weather will be fine.

C. It will be freezing cold.               D. It will be rainy.