问题 填空题

(1)对可逆反应aA(g)+bB(g)cC(s)+dD(g)达到平衡时,其反应的K值与温度有关。请写出该反应的平衡常数表达式_____________

现有反应:CO(g)+H2O(g)CO2(g)+H2(g) ΔH<0。在850 ℃时,K=1。

(2)若升高温度到950 ℃,达到平衡时K________1(填“大于”“小于”或“等于”)

(3)850 ℃时,若向一容积可变的密闭容器中同时充入1.0 mol CO、3.0 mol H2O、1.0 mol CO2和x mol H2

①当x=5.0时,上述平衡向________(填“正反应”或“逆反应”)方向移动。

②若要使上述反应开始时向正反应方向进行,则x应满足的条件是________________。

答案

(1)K=cd(D)/[ca(A)cb(B)[(或K=[D]d/([A]a[B]b))

(2)小于

(3)①逆反应;②0 ≤x <3

阅读理解

Chinese Dinner Table

Of course, the main difference on the Chinese dinner table is chopsticks instead of knife and fork, but that’s only superficial. Besides, in decent restaurants, you can always ask for a pair of knife and fork, if you find the chopsticks not helpful enough. The real difference is that in the West, you have your own plate of food, while in China the dishes are placed on the table and everyone shares. If you are being treated to a formal dinner and particularly if the host thinks you’re in the country for the first time, he will do the best to give you a taste of many different types of dishes.

The meal usually begins with a set of at least four cold dishes, to be followed by the main courses of hot meat and vegetable dishes. Soup then will be served (unless in Guangdong style restaurants) to be followed by staple food ranging from rice, noodles to dumplings. If you wish to have your rice to go with other dishes, you should say so in good time, for most of the Chinese choose to have the staple food at last or have none of them at all.

Perhaps one of the things that surprise a western visitor most is that some of the Chinese hosts like to put food into the plates of their guests. In formal dinners, there are always “public” chopsticks and spoons for this purpose, but some hosts may use their own chopsticks. This is a sign of genuine friendship and politeness. It is always polite to eat the food. If you do not eat it, just leave the food in the plate.

People in China tend to over-order food, for they will find it embarrassing if all the food is consumed. When you have had enough, just say so. Or you will always overeat!

小题1:The real difference on dinner table between China and West is that___________.

A.You’re treated to a formal dinner for the first time.

B.On Chinese dinner table, chopsticks replace knife and fork.

C.The host will do the best to give you a taste of many different types of dishes.

D.You have your own plate of food in West while in China everyone shares the dishes.小题2:If you have a dinner in a Chinese home, in which order will the food be served?

a. serving soup.

b.a set of four cold dishes.

c. staple food such as rice, noodle or dumplings.

d. the main courses of hot meat and vegetable dishes.

A.badc

B.cabd

C.bdac

D.cdab小题3:The “public chopsticks and spoons” are used to ______.

A.taste different dishes

B.consume the food in the plate

C.show the friendship and politeness

D.put food into the plates of their guests小题4:According to the message, the author’s attitude towards Chinese dinner table is______

A.critical

B.objective

C.negative

D.positive

单项选择题 A1型题