问题 选择题

已知l g CH4完全燃烧生成CO2和液态水时放出55.6kJ的热量,则下列甲烷燃烧的热化学方程式正确的是

答案

答案:D

题目分析:本题考查热化学方程式的正误判断。解此类题目注意“五查”;一查各物质的聚集状态标注是否正确,固态——s,液态——l,气态——g,水溶液——aq;二查焓变的符号,吸热反应用“+”,放热反应用“—”;三查焓变的单位是否正确;四查焓变的数值与化学计量数是否对应;五查是否符合相关的概念,如燃烧热、中和热等。A、没有标注各物质的聚集状态,错误;B、该反应放热,△H应为负值,错误;C、焓变的数值与化学计量数不对应,错误;

选择题
阅读理解

Nowadays , people in China are increasingly interested in celebrating foreign festival , especially those western festivals .

A survey conducted recently by sina.Com showed that among the 18,222 people surveyed 63.9% said celebrating Christmas is just another way of recreation ,nothing serious while  17.85% surveyed considered the festival as a fashion act , showing they were not "out".These two parts clearly indicate the general opinion of the young .10.45 percent people involved said the celebration of a religious western festival with so much enthusiasm is absolutely ridiculous pursuit of foreign goodness .Only 7.8% of people define Christmas as a kind of festival colonization(殖民)。

The arising of celebrating foreign festivals clearly has something to do with the advancement of China's economy .In my opinion of view ,Christmas and other festivals celebrated in China have difference from the  origin  .They have lost their religious background and turned into a big occasion to have fun and enjoy life .Shop owners' pockets are filled, the public's hunger for happiness is filled , and that is enough . Foreign festivals in china are more like carnivals giving people pleasure and enjoyment .

The crisis (危机)of traditional Chinese festivals that are losing their attraction may be linked to the culture tradition and background of the festivals. Most Chinese festival culture is related more or less to real life.

But the western culture shows much of romance .Some festivals have their religious background while others have much to do with culture and people .At this point , food seems to be too plain .Flowers and chocolates are more welcomed.

Foreign festivals in China today are celebrated for fun . They give people opportunities to relax and to show appreciation and gratefulness . The acceptance of foreign festivals generally depends on the openness of the public , the familiarity with the western culture , and most importantly , on people's economic status.

60 From the survey we know that among the people surveyed _________

A .Most think celebrating foreign festivals is ridiculous

B .Many fear that traditional Chinese festivals will disappear soon

C.Some think that celebrating foreign festivals is a sign of foreign                                                               goodness chasing

D half think celebrating foreign festivals makes people not go out of faction

61. The writer think that foreign festivals celebrated in China ________

A have lost their religious background

B are the same as those celebrated in the west

C can give more fun than traditional Chinese festivals

D may reduce the hunger of  public people

62. What is the main difference between foreign festivals and traditional Chinese ones ?

A Foreign festivals can make Chinese shop owners'pockets full quickly

B The food at foreign festivals is too simple

C Chinese festivals always have something to do with culture

D Foreign festivals are romantic while traditional Chinese ones are connected with       reality

63. Which of the following may NOT be the reason why so many people accept foreign festivals?

A People can relax themselves .

B People can show their thanks to others

C Foreign festivals have longer histories than Chinese ones

D People have known more about the western culture.