问题 计算题

在烧杯中加入2.14g久置的铝箔,再滴加稀硫酸,放出气体的质量与所加稀硫酸质量的关系如右图所示。请回答下列问题:

(1)产生氢气    g,刚开始滴加稀硫酸没有氢气放出的原因是              

(2)所滴加的稀硫酸中溶质的质量分数。

(3)铝箔中铝元素的质量。

答案

(1)0.2 盐酸与氧化铝反应   (2)10%    (3)92.52%

由放出气体的质量与所加稀硫酸质量的关系图可以看出生成的氢气的质量为0.2g,开始与酸反应的是氧化铝。

设参加反应的铝的质量为x, 所滴加的稀硫酸中溶质的质量分数为y,则

2Al+3H2SO4=Al2(SO4)3+3H2

54   294             6

x  (107.8g-9.8g)y     0.2g

==  x=1.8g  y=10%

答:(1)产生氢气的质量为0.2g,(2)所滴加的稀硫酸中溶质的质量分数为10%,(3)铝箔中铝元素的质量为1.8g。

填空题
阅读理解

According to legend, the Bridge of Sighs in Venice, Italy, which connects the Palazzo Ducale to an ancient prison, got its name because the walk across it gave prisoners on their way to jail a final chance to appreciate the beauty of the city.

The view from the bridge today, however, is more likely to be of a giant billboard selling Bulgari or Coca – cola. Beyond the billboards, monuments are being restored. The money comes from advertising profits.

But when the Coke billboards went up this summer on buildings near the Piazza San Marco, which is at the historic heart of Venice, there was a public debate.

“We can’t commercialize everything,” said Alessandra Mottola Molfino, a Venetian. “The lesson that goes out is that a price is for everything.”

“We couldn’t stay quiet,” said Maria Camilla Bianchini d’Alberigo, president of a heritage protection association. “Too much is too much.”

There needed to be rules, she added, rules that prevent the advertising billboards clashing (冲突) with the monuments of the city.

City of officials, however, argue that without these ads, the city could not afford to maintain its heritage. Many have been damaged by centuries of wear and are even a threat to public safety.

“I can’t turn down the image of bottle when there are pieces of the Palazzo Ducale falling to the ground,” said Renata Codello, a Cultrue Ministry official.

The Culture Minister has a budget of about $ 47 million (315 million yuan) for restoration of monuments, but Italy has a rich architectural heritage, and funds are always tight.Of that amount,

$ 1.8 million was given to the entire Vector region,  which includes Venice.

Two years ago, the city signed an agreement with the Dotter Group, a company responsible for the restoration of the Bridge of Sighs and the Palazzo Ducale.It allows it to sell ad space.

But there is a condition in the agreement: The ads should not offend public taste,

In August, Venice banned US actress Julianne Moore's Bulgrari ad from a billboard in the Piazza San Marco.

The photo shows a naked Moore covered with lion cubs, handbags and jewelry, Mayor Giorgio Orsoni called the image too racy (猥亵) and unsuitable for the Piazza San Marco.

"I take account of the fact that Venice is part of the real world… but we cannot accept these Hollywood-style images.There arc intelligent sponsors, and we need to come up with advertising that suits Venice, not Times Square," he said in a speech.

小题1:The article is mainly about        in Venice

A.restoration of cultural heritage

B.widespread commercialization

C.the conflict between ads and cultural heritage

D.the difficulty of restoring monuments小题2:In the first paragraph, the beautiful view from the Bridge of Sighs is mentioned to      .

A.introduce other monuments of the ancient city

B.show how much many ancient structures need restoring

C.indicate that the view is blocked by huge ads

D.create interest in the famous city小题3:From the article we can conclude that Rcnata Codello        the advertising.

A.is in favor of

B.is worried about

C.objects to

D.doesn't mind小题4:Why do many Venetians complain about the ads?

A.They are intolerant of commercialization.

B.They feel the ads are damaging the city.

C.The ads are usually racy and in an American style.

D.The ads don't present a traditional view of Venice,小题5:It can be inferred from the passage that

A.Hollywood stars' ads cannot go up in Venice

B.the mayor of Venice is expecting new advertising

C.the Dotter Group may stop its restoration work for lack of funds

D.people can buy Bulgaria or Coca-cola on the Bridge of Sighs