问题 选择题

已知723K时,2SO2(g)+O2(g)2SO3(g)  ΔH=-QkJ·mol-1。在相同条件下,向一密闭容器中通入2molSO2和1molO2,达平衡时放出热量为Q1;向另一体积相同的密闭容器中通入1molSO2和0.5molO2达到平衡时放出的热量为Q2,则Q1、Q2、Q满足的关系是(  )

A.Q=Q1/2

B.Q2<Q1/2

C.Q2<Q1<Q

D.Q=Q1>Q2

答案

BC

Q指生成2molSO3完全反应时放出的热。若把2molSO2和1molO2混合,达平衡时生成的SO3小于2mol,则Q1<Q;若将反应物的量减半,由于其他条件相同,压强减小,SO2的转化率减小,生成SO3的量比第一容器的一半少,放出的热量Q2<Q1/2。

问答题 简答题
单项选择题

After winning a big game, athletes are often asked how they feel. Usually athletes say how (1) it is to win this big game. On the contrary, the fact is that losing a big game, or in my case, all the games, can be even harder.

From the spectators’ point of view, last year’s basketball (2) for my high school team was nothing (3) of an embarrassment. And (4) 0 and 20 is certainly nothing to be proud of, that season had a bigger impact on me than any other. As a team captain, I knew it probably wouldn’t be the (5) year, but did I ever think we would lose every game Of course not. Since six of our top players had graduated, it was clear that we were a (n) (6) team who would struggle. The struggle began earlier than expected, (7) , as our team center was suspended (禁赛) for the season, and two key members decided to (8) for some reason. At this point, dropping out probably passed through every player’s mind, but in the end, we all stuck if out, (9) to work still harder.

Then there came a time when even our (10) and given up on us. Personally, I felt like it was (11) worthwhile giving my all. I thought, if even the coach doesn’t believe in us, why should I But just as my hope began to (12) , a teammate called a meeting. He said," Nobody thinks we are going to win, but, as teammates and friends, we (13) it to each other to go all out every game. "

It was that moment that (14) me how to be a leader. It hit me that I certainly didn’t (15) the role. As a leader you can never quit (16) the team who looks up to you. It is one (17) to be named captain, feel great and go through the motions, but it is quite another to be a real captain and make sure everyone realizes their full (18) all the time.

I am sure it is great to go through without losing and bringing home awards. But in all honesty, I (19) the fact that my team lost every game last year. It may not help me to become a better basketball player, but it already has made me a better leader, and (20)

9().

A.hoping

B.swearing

C.claiming

D.wishing