问题 选择题

化学反应A2(g)+B2(g)═2AB(g)的能量变化如图所示,下列叙述中正确的是(  )

A.每生成2个分子AB吸收(a-b) kJ热量

B.该反应热△H=+(a-b)kJ•mol-1

C.该反应中反应物的总能量高于生成物的总能量

D.断裂1mol A-A和1mol B-B键,放出a kJ能量

答案

A、依据图象分析判断1molA2和1molB2反应生成2molAB,每生成2molAB吸收(a-b) kJ热量,故A错误;

B、应焓变等于反应物能量总和-生成物能量总和;该反应热△H=+(a-b)kJ•mol-1,故B正确;

C、依据能量图象分析可知反应物能量低于生成物能量;故C错误;

D、断裂1 mol A-A和1 mol B-B键,吸收a kJ能量,故D错误;

故选B.

完形填空

根据照句子结构的语法性,在下面空格处填入一个适当的词语或使用括号中词语的适当形式填空, 并将答案填写在答题卡标号为31~45的相应位置上。

31. Liu Xiang was proud to have won _______ gold medal in the 110-meter hurdle in the 28th Olympics.

32. When she was a child, her ambition was _______(admit) to a famous university.

33. Tom feels that _______(accept) by others is a great pleasure for him.

34. The Internet has not seen anything quite like Susan Boyle _______ online popularity is headed straight to the history books.

35. The 16th Asian Games will be held from November 12th to 27th, 2010, _______ many reporters will be there to cover the events.

36. Day dreaming again, Ellison? Now _______ you need to do is to work hard.

37. Many scientists hold the belief _______ cloning may lead to many important scientific breakthroughs and medical treatments.

38. Newspapers keep us ________(inform) of what is going on around the world.

39. Poorly ________ (write), the article was turned back by the editor.

40. The rescue team members ________ (search) the lost for a week, but about 20 students are still missing.

41. As it is known to all, eating fruit and vegetables is ________ (benefit) to our health.

42. -- I have finally passed the driving test!

-- _______(congratulate)!

43. Candy only played a small part in one movie, but she fancied _______ as a famous actress.

44. She sings as ______(merry) as a little bird.

45. Don't drink and drive. You know _______ is dangerous to drink and drive.

多项选择题