问题 选择题

已知反应:①101 kPa时,2C(s)+O2(g)=2CO(g) ΔH=-221 kJ·mol1

②稀溶液中,H(aq)+OH(aq)=H2O(l)ΔH=-57.3 kJ·mol1

③H2(g)O2(g)=H2O(g)ΔH=-241.8 kJ·mol1

④H2O(g)=H2O(l)ΔH=-44.0 kJ·mol1

下列结论正确的是(  )

A.碳的燃烧热大于110.5 kJ·mol1

B.浓硫酸与稀NaOH溶液反应生成1 mol水,放出57.3 kJ热量

C.氢气的燃烧热为241.8 kJ·mol1

D.2H2(g)+O2(g)=2H2O(l)的反应热为ΔH=+571.6 kJ·mol1

答案

答案:A

燃烧热是指1 mol物质燃烧生成稳定氧化物所放出的热量,C完全燃烧的产物是CO2,CO继续燃烧生成CO2放出热量,那么C的燃烧热大于110.5 kJ·mol1;浓硫酸中的H与稀NaOH溶液反应生成1 mol水,放出57.3 kJ热量,但是浓硫酸的稀释又有热量释放,所以该反应过程放出的热量大于57.3 kJ;根据盖斯定律,③④相加得到热化学方程式H2(g)+O2(g)=H2O(l) ΔH=-285.8 kJ·mol1,该反应为放热反应,故ΔH的符号为“-”。

单项选择题 A1型题
单项选择题

The Southdale shopping centre in Minnesota has an atrium, a food court, fountains and acres of parking. Its shops include a Dairy Queen, a Victoria’s Secret and a purveyor of comic T-shirts. It may not seem like a landmark, as important to architectural history as the Louvre or New York’s Woolworth Building. But it is. "oh, my god!" chimes a group of teenage girls, on learning that they are standing in the world’s first true shopping mall. "That is the coolest thing anybody has said to us all day. "

In the past half century Southdale and its many imitators have transformed shopping habits, urban economies and teenage speech. America now has some 1,100 enclosed shopping malls, according to the International Council of Shopping Centres. Clones have appeared from Chennai to Martinique. Yet the mall’s story is far from triumphal. Invented by a European socialist who hated cars and came to deride his own creation, it has a murky future. While malls continue to multiply outside America, they are gradually dying in the country that pioneered them.

Southdale’s creator arrived in America as a refugee from Nazi-occupied Vienna. Victor Gruen was a Jewish bohemian who began to design shops for fellow immigrants in New York after failing in cabaret theatre. His work was admired partly for its uncluttered, modernist look, which seemed revolutionary in 1930s America. But Gruen’s secret was the way he used arcades and eye-level display cases to lure customers into stores almost against their will. As a critic complained, his shops were like mousetraps. A few years later the same would be said of his shopping malls.

By the 1940s department stores were already moving to the suburbs. Some had begun to build adjacent strips of shops, which they filled with boutiques in an attempt to re-create urban shopping districts. In 1947 a shopping centre opened in Los Angeles featuring two department stores, a cluster of small shops and a large car park. It was, in effect, an outdoor shopping mall. Fine for balmy southern California, perhaps, but not for Minnesota’s harsh climate. Commissioned to build a shopping centre at Southdale in 1956, Gruen threw a roof over the structure and installed an air-conditioning system to keep the temperature at 75°F (24℃)—which a contemporary press release called "Eternal Spring". The mall was born.

Gruen got an extraordinary number of things right first time. He built a sloping road around the perimeter of the mall, so that half of the shoppers entered on the ground floor and half on the first floor-something that became a standard feature of malls. Southdale’s balconies were low, so that shoppers could see the shops on the floor above or below them. The car park had animal signs to help shoppers remember the way back to their vehicles. It was as though Orville and Wilbur Wright had not just discovered powered flight but had built a plane with tray tables and a duty-free service.

Why did critics complain that Gruen’s "shops were like mousetraps" ()

A. Gruen designed his shops in a way capable of luring customers in

B. Gruen designed his shops with an appearance of mousetrap

C. Gruen’s shops were famous for the mousetraps they sold

D. Gruen’s shops sold things much more expensive than that of other ones