问题 实验题

小红对冰加热,她根据冰熔化成水直到沸腾的过程的记录数据,绘制成如图所示的温度随时间变化的图象。图象中的      段是冰的熔化过程,      段是水的沸腾过程,已知冰的比热容是2.1×103 J/(kg·℃),在对100g冰加热的前2 min内冰吸热    J。

答案

BC ;DE;8.4×103

题目分析:冰的熔化特点是温度达到熔点吸热温度不变,符合随时间增大温度不变且温度为零度的是BC段,水的沸腾特点是温度达到沸点,吸热温度不变,符合达到沸点100摄氏度,随时间增加温度不变的线段为DE段,冰前2min吸热为Q=cmΔt=2.1×103 J/(kg·℃)×0.1kg×40℃=8.4×103J.

填空题
阅读理解

Our plan was to drive into Cambridge, catch the 7:34 train to Liverpool Street Station, then to separate and meet again for lunch.We should have arrived at Liverpool at 9:19, but due to a typical London fog, the train had to move along so slowly that it wasn’t until 10:30 that it got there.In spite of our late arrival, Joan, my wife’s sister, decided that she would go to see the Crown Jewels in the Tower of London while we went shopping.It was only after her sister had disappeared into the fog that my wife realized that we hadn’t decided where we should meet for lunch.Since I had our three tickets for the concert in my pocket, this was indeed a problem.There seemed to be nothing we could do except taking a taxi to the Tower of London, and try to find her there.Needless to say, we didn’t find her.

It was now one o’clock, and the concert began at 2:30.“Perhaps she will think of waiting outside the concert hall,” suggested my wife hopefully.By this time the fog was so thick that road traffic had to stop, and the only way to get there was by underground railway.Hand in hand we felt our way along the road to where we thought the nearest station should be.An hour later we were still trying to find it.Just as I was about to lose my temper completely when we met a blind man tapping his way confidently through the fog.With his help we found Tower Hill tube station just fifty yards down the road.

By now it was far too late even to try to get to the concert hall before the performance began at 2:30, so we decided to return to Cambridge.It took seven long hours instead of the usual two to make that journey.Nor were we able to get any food and drink on the train.Tired and hungry we finally reached home at ten, opening the door to the sound of the telephone bell.It was Joan; she had seen the Crown Jewels, had managed to get another ticket for concert, and had had a wonderful dinner at a restaurant near the hotel where she decided to stay for the night.Now she was ringing to discover whether we had had an equally successful day.

1.Why was Joan separated from her sister and her brother-in-law?

A.they could not see each other because of the fog.

B.Joan had not seen Crown Jewels.

C.They planned to do different things until lunch time.

D.The writer didn’t want to go to the concert.

2.What did the writer plan to do in the afternoon?

A.Go to the concert.                      B.See the Crown Jewels.

C.Return to Cambridge.                    D.Go shopping.

3.The reason why they didn’t all meet for lunch was that _______.

A.They lost their way in the fog

B.they forgot to make necessary arrangement

C.they waited at different places and didn’t meet each other

D.the couple couldn’t find the underground station

4.It’s quite clear that for Joan the trip to London had been ________.

A.spilt by the fog                      B.quite tiring  

C.rather disappointing               D.very enjoyable