问题 判断题

车辆下坡行驶,要适当控制车速,充分利用发动机进行制动。

答案

参考答案:

填空题

二氧化硫和氮氧化物(NOx)对大气污染日趋严重,研究消除大气污染的方法是化学工作者的重要课题,目前有很多种方法消除大气污染.

(1)可利用甲烷催化还原NOx的方法处理NOx,反应如下:

CH4(g)+4NO2(g)=4NO(g)+CO2(g)+2H2O(g);△H=-574kJ•mol-1

CH4(g)+4NO(g)=2N2(g)+CO2(g)+2H2O(g);△H=-1160kJ•mol-1

则CH4(g)+2NO2(g)=N2(g)+CO2(g)+2H2O(g);△H=______;

(2)汽车尾气中的主要污染物有CO、NOx、碳氢化合物等,降低汽车尾气的方法之一是在排气管上安装催化转化器,发生如下反应:

2NO(g)+2CO(g)⇌N2(g)+2CO2(g);△H<0.

生成无毒物质,减少汽车尾气污染.若在一定温度下,将2molNO、1molCO充入1L固定容积的容器中,15分钟后达到平衡,反应过程中各物质的浓度变化如图1所示,则

①前15s内的平均反应速率v (N2)=______(小数点保留3位);

②该反应平衡常数K=______(小数点保留3位);

③若保持温度不变,20min时再向容器中充入CO、N2各0.6mol,平衡将______移动(填“向左”、“向右”或“不”);20min时,若改变反应条件,导致N2浓度发生如图1所示的变化,则改变的条件可能是______(填序号);

a  加入催化剂   b  降低温度   c  缩小容器体积   d  增加CO2的量

④该可逆反应△S______0(填“>”、“<”或“=”),在______(填“高温”、“低温”或“任何温度”)下能自发进行.

(3)CO分析仪以燃料电池为工作原理,其装置如图2所示,该电池中电解质为氧化钇-氧化钠,其中O2-可以在固体介质NASICON中自由移动.下列说法错误的是______

A.负极的电极反应式为:CO+O2--2e-=CO2

B.工作时电极b作正极,O2-由电极a流向电极b

C.工作时电子由电极a通过传感器流向电极b

D.传感器中通过的电流越大,尾气中CO的含量越高

(4)利用Fe2+、Fe3+的催化作用,常温下将SO2转化为SO42- 而实现对SO2的处理目的.其中Fe3+的最外层电子排布式为______;SO2的VSEPR模型名称为______;与SO2互为等电子体的离子有______.

(5)N2O5是重要的硝化剂和氧化剂,可用电解法制备N2O5,如图3所示,N2O5在电解池的______(填“阳极”或“阴极”)区生成,其电极反应式为______.

阅读理解

阅读理解。

     Dolphins and sharks are showing up in surprisingly shallow water just off the Florida coast. Mullets, crabs,

rays and small fish gather by the thousands off an Alabama pier. Birds covered in oil are crawling deep into

marshes (沼泽), never to be seen again.

     Marine scientists studying the effects of the BP disaster (英国石油公司漏油事件) are seeing some strange

phenomena. Fish and other wildlife seem to be fleeing the oil out in the Gulf and clustering in cleaner waters

along the coast in a trend that some researchers see as a potentially troubling sign. The animals' presence close

to shore means their usual habitat is badly polluted, and the crowding could result in mass die-offs as fish run

out of oxygen. Also, the animals could easily be captured by their enemies.

     The nearly two-month-old spill (漏油) has created an environmental disaster in US history as tens of millions

of gallons have flown into the Gulf of Mexico ecosystem. Scientists are seeing some unusual things as they try

to understand the effects on thousands of species of marine life.

     For nearly four hours Monday, a three-person crew with Greenpeace cruised past delicate islands and

mangrove-dotted inlets in Barataria Bay off southern Louisiana. They saw dolphins by the dozen frolicking (嬉

戏) in the oily sheen (光泽) and oil-tinged pelicans feeding their young. But they spotted no dead animals.

     "I think part of the reason why we're not seeing more yet is that the impacts of this crisis are really just

beginning," Greenpeace marine biologist John Hocevar said.

     The counting of dead wildlife in the Gulf is more than an academic exercise; the deaths will help determine

how much BP pays in damages.

1. What does the marine life react to the BP disaster?

A. Birds crawl deep into caves.

B. Dolphins and sharks show up in deep water.

C. Tens of thousands of marine animals are found dead.

D. Sea creatures flee from the spilled oil, gathering near the seashore.

2. Which of the following is NOT related to the potentially troubling sign?

A. The usual habitat of deep-water animals is badly polluted.

B. Many animals could be easily eaten by their enemies.

C. Masses of fishes could die due to lack of oxygen.

D. Some dolphins are frolicking in marshes.

3. The environmental disaster was caused by ____.

A. the damage of the Mexico Gulf ecosystem

B. the lack of environmental sense of BP

C. the nearly two-month-old oil spill

D. the crowding marine life

4. What is John Hocevar's attitude towards the disaster?

A. Worried.

B. Disappointed.

C. Depressed.

D. Optimistic.

5. From the passage, we can infer that ____.

A. BP will pay much money according to the number of the dead wildlife there

B. marine scientists have seen some strange phenomena

C. the disaster has little influence on dolphins

D. a three-person crew reached no conclusion