问题 填空题

下 * * 个化学反应的平衡常数(K1、K2、K3)与温度的关系分别如下表所示:

请回答:

(1)反应①是______(填“吸热”或“放热”)反应。

(2)写出反应③的平衡常数K3的表达式____________。

(3)根据反应①与②可推导出K1、K2与K3之间的关系,则K3=____________(用K1、K2表示)。

(4)要使反应③在一定条件下建立的平衡向逆反应方向移动,可采取的措施有________(填写字母序号)。

A.缩小反应容器的容积     B.扩大反应容器的容积     C.升高温度

D.使用合适的催化剂       E.设法减 * * 衡体系中的CO的浓度

(5)若反应③的逆反应速率与时间的关系如图所示:  

①可见反应在t1、t3、t7时都达到了平衡,而t2、t8时都改变了一种条件,试判断改变的是什么条件:t2时__________________; t8时_________________。       

②若t4时降压, t6时增大反应物的浓度,请在图中画出t4~t6时逆反应速率与时间的关系线。

答案

(1)吸热

(2)

(3)  

(4)CE

(5)①升高温度或增大CO2的浓度(增大H2的浓度);使用催化剂

问答题
阅读理解

阅读理解。

     No one likes germs. You wash your hands often and avoid sick people. But some of the germiest places

are in your own home where you can't avoid them!

     Over 77, 500 bacteria per square centimeter can live in your kitchen sink drain. More bacteria live in and

around the sink itself. To get rid of them, clean the entire sink area with a disinfectant.

     Those wet clothes from your washer are not all that clean, especially if they include underwear. Use hot

water and bleach to wash underwear as it contains E.coli (大肠秆菌). Put wet laundry in the dryer quickly

so the bacteria do not multiply.

     The germs you wash off your body stay in the tub-about 15.500 bacteria per square centimeter! Use a

disinfectant to clean your tub weekly. And dry the tub with a clean towel so more germs won't grow on the

wet surface.

     You'll find plenty of germs outside your home too.

     Lots of germs live on the buttons of your local ATM. According to www.health.corn, Chinese researchers

tested 38 ATMs in downtown Taipei. They found that each button hosted an average of 1,200 germs. Use a

hand sanitizer after using the ATM and after handling paper money too.

     The bottoms of women's purses house tens of thousands if not millions of bacteria. University of Arizona

researchers discovered all kinds of different bacteria on purse bottoms. These included E.coli as well as

bacteria that cause eye and skin infections. Women should wipe their purses every few days with a mild soap

solution.

     All kinds of germs live on shopping cart shopping cart handles. Lots of people touch the handles each day-

and who knows where their hands have been! Carry disinfectant wipes and use them on the handles. That will

kill nearly all germs.

1. How many germy places are mentioned in this passage?

A. two

B. four

C. six

D. eight

2. What does the underlined word disinfectant mean in the second paragraph?

A. a kind of germ

B. a tablecloth

C. a kind of cleaning tool

D. a kind of chemical liquid which can kill germs

3. Which of the following statement is NOT true according to the passage?

A. Some of the germiest places are outside your home.

B. Use a disinfectant to clean your bathtub weekly.

C. Use a hand sanitizer after using an ATM or handling paper money.

D. Thousands of not millions of bacteria live on the bottoms of women's purses.