问题 填空题

(10分)计算填空:

(1)(2分)1mol某金属单质与足量的H2SO4反应,放出1.5molH2(标况下)并转化为具有Ne原子的电子层结构的离子,则该金属在周期表的位置                         

(2)(6 分)已知在2L的容器中进行下列可逆反应,各物质的有关数据如下:

_                                aA (g)+ bB (g) 2C(g)

起始物质的量(mol):   3      2           0

2s末物质的量浓度(mol/L): 0.9     0.8         0.4

则①a=                ,b=                       ;  

②2S内B的反应速率=                           

(3)(2分) 1 mol NO2和1mol CO反应生成CO2和NO过程中能量变化示意图,请写出NO2和CO反应的热化学方程式                                                

答案

(1)第三周期第ⅢA族(2分)

(2)①a=3(2分)  b="1" (2分)  ②0.1mol/(L·S)(2分)

(3)NO2(g) + CO(g) =  CO2(g) + NO(g) △H =" -" 234kJ·mol-1(2分)

(1)1.5mol氢气,共转移电子是1.5mol×2=3.0mol,所以该金属原子在反应中失去3铬电子。由于离子具有氖原子的电子层结构,因此金属的原子序数为13,即为铝元素,位于第三周期第ⅢA族。

(2)根据方程式可知A、B、C的浓度变化量分别是(mol/L)0.6、0.2、0.4,所以化学计量数之比为3︰1︰2,因此a=3,b=1。B的平均反应速率是

(3)根据图像可知,反应物的总能量高于生成物的总能量,所以是放热反应,反应热为134 kJ·mol-1-368 kJ·mol-1=- 234kJ·mol-1,所以反应的热化学方程式为NO2(g) + CO(g) =  CO2(g) + NO(g) △H =" -" 234kJ·mol-1

问答题 简答题
单项选择题

The world is undergoing tremendous changes. The rise of globalization, both an economic and cultural trend that has swept throughout the world, has forged new ground as we enter the 21st century. But are the effects of globalization always positive Some say no.

Michael Tenet, head of the International Institute for Foreign Relations in Atlanta, is worried about current resentment throughout the world toward the rise of globalization. "Ever since the 1980s and the economic collapse of the Asian Tigers in the late 1990s, there has been a re-evaluation of the role of globalization as a force for good," he said. "Incomes in many countries have declined and the gap between the most rich and the most poor has been aggravated. Without further intervention by governments, we could see a tragedy expressed in an increased level of poverty throughout the Latin America and Asia."

Yet George Frank, an influential economist who works on Wall Street, sees no such danger. "Economic liberalization, increased transparency and market-based reforms have positive effect in the long run, even if market mechanisms can produce short-term destabilization problems," he said. "What is most important is that barriers to trade continue to fall so that active competition for Consumer goods reduces prices and in turn raises the average level of income."

Others feel that globalization’s cultural impact may be more important than its economic implications. Janice Yawee, a native of Africa, feels ply that globalization is undermining her local culture and language. "Most of the world’s dialects will become extinct under globalization. We’re paving the world with McDonald’s and English slang. It tears me up inside," she said.

Governments of different countries have had mixed responses to the wave of globalization. The United States is generally seen as an active proponent of greater free trade, and it certainly has enormous cultural influence by virtue of its near monopoly on worldwide entertainment. But other countries, most notably in Europe and developing nations, have sought to reduce the impact that globalization has on their domestic affairs.

"When I was a boy we had very little to speak of," says one Singaporean resident. "Now our country has developed into a booming hub for international finance." Others, however, are not so optimistic. "Globalization is an evil force that must be halted," a union official at a car plant in Detroit recently commented, "It’s sucking away jobs and killing the spirit of our country." (401 words)

Notes: slang 俚语。tear up 撕碎,挖开。proponent 支持者,拥护者。hub 轮毂。suck away减少。

The views of Michael Tenet and George Frank on globalization are()

A. identical

B.similar

C. complementary

D. opposite