问题 选择题

(8分)(1)一定质量的理想气体,体积由V1压缩至V2,第一次是经过一个等温过程,最终气体压强是p1、气体内能是E1;第二次是经过一个等压过程,最终气体压强是p2、气体内能是E2;则p1________p2,E1_______E2.(填“>” “=”或“<”) 

(2) 当把一滴用酒精稀释过的油酸滴在水面上时,油酸就在水面上散开,油酸分子就立在水面上,形成单分子层油膜,现有按酒精与油酸的体积比为m∶n 配制好的油酸酒精溶液置于容器中,还有一个装有约2cm深水的浅盘,一支滴管,一个量筒.现用滴管从量筒中取V体积的油酸酒精溶液,让其自由滴出,全部滴完共为N滴.

① 用滴管将一滴油酸酒精溶液滴入浅盘,待油酸薄膜稳定后,将薄膜轮廓描绘在坐标纸上,如图所示.(已知坐标纸上每个小方格面积为S,求油膜面积时,半个以上方格面积记为S,不足半个舍去)则油膜面积为________.

②写出估算油酸分子直径的表达式________.

答案

(1) >(2分) >(2分)(2) ① 8S(2分) ② (2分)

(1)等温过程,体积减小,压强增大,p1>p2;等压过程,体积减小,温度减小,E1>E2

(2)①根据图可得8S;②油酸的体积为,油酸分子直径的表达式

完形填空
A young man was getting ready to graduate(毕业)from college. For many months he had admired(欣赏,羡慕) a beautiful sports car in a seller's showroom, and knowing his father could      it, he told him that was all he wanted.
On the morning of his graduation day his father called him into his own study and told him how     he was to have such a fine son. He handed his son a beautiful gift box.    but slightly(轻微地) disappointed, the young man opened the box and found a lovely book.     ,he raised his voice at his father and said, "With all your money you only give me a book?" Then he rushed out of the house,     the book in the study.
He didn't contact(联系) his father for a whole year    one day he saw an old man who looked like his father in the street. He realized he had to go back home and see his father.
When he arrived at his father's house, he was told his father had been in hospital for a week. When he was going to      the hospital, he saw the new book still on the desk, just as he had left it one    before. He opened it and began to turn the pages. Suddenly, a car key _____ from an envelope(信封) behind the book. It had a tag(标签).On the tag was the     of his graduation, and the words PAID IN FULL.
小题1:
A.sellB.affordC.keepD.like
小题2:
A.comfortableB.encouragedC.proudD.moved
小题3:
A.CarefulB.SeriousC.NervousD.Curious(好奇的)
小题4:
A.AngrilyB.HappilyC.CalmlyD.Quietly
小题5:
A.puttingB.takingC.leavingD.forgetting
小题6:
A.untilB.asC.beforeD.unless
小题7:
A.get toB.leave forC.turn toD.arrive
小题8:
A.yearB.monthC.weekD.day
小题9:
A.lostB.cameC.appearedD.dropped
小题10:
A.metB.placeC.dateD.picture
单项选择题