问题 实验题

小芳同学用如图甲所示的实验装置探究“水沸腾时温度变化的特点”。

(1)在图甲中,温度计的使用方法存在的错误之处是                     

(2)小芳同学在水温升高到90℃时开始记录数据,并根据数据画出了水的温度随加热时间而变化的图像,如图乙所示。从图乙中可以看出水的沸点是     ℃。

(3)从乙图中还可看出,水在沸腾过程中不断        (选填“吸收”或“放出”)热量且温度保持不变。

答案

(1)温度计与烧杯壁接触    (2)98     (3)吸收

题目分析:(1)甲图中,温度计的液泡碰到了烧杯壁,这样测量的不是水的温度,温度计的使用方法错误。

(2)从图像可以看出,水的温度上升到98℃时,温度保持不变,所以水的沸点是98℃。

(3)从10到15分钟,酒精灯对水继续加热,但水的温度保持不变,可以看出水在沸腾过程中不断吸收热量且温度保持不变。

单项选择题
完形填空
At the beginning of my 8:00 a.m.class one Monday at University of Nevada,Las Vegas(UNLV),I cheerfully asked my students    their weekend had been.“Not been very good”,one young man said.He'd had his wisdom teeth      .The young man then went on to ask me why I   seemed to be so cheerful.His question reminded me of    I′d read somewhere before:”Every morning when you get up,you have a     about how you want to approach life that day”,I said.“I choose to be cheerful”.
“Let me give you an    ”,I continued.The other 60 students in the class     their chatter and began to listen.one day,my car died on the way.I called AAA and asked them to send a     .The secretary in the Provost’S office asked me what had happened.”This is my      day”, I replied,smiling.”Your Car      and today is your lucky day?”She Was      .”What do you mean?”“I live 17 miles from here”,I replied.”My car    have gone wrong anywhere along the freeway.It didn’t.Instead,it went wrong in the      place:off the freeway,within walking distance of here.I’m     able to teach my class,and I’ve been able to arrange for the tow truck to    me after class.”The secretary’s eyes opened wide,and then she smiled.
I scanned the 60 faces in the lecture hall.    the early hour,no one seemed to be asleep.Somehow,my story had    them.Or maybe it Wasn’t the story    .It had all started with a student's      that I Was cheerful.A wise mail once said:”Who you are     louder to me than anything you can say”.I suppose it must  be so.
小题1:
A.howB.whatC.whetherD.where
小题2:
A.pulledB.broughtC.takenD.removed
小题3:
A.seldomB.alwaysC.occasionallyD.ever
小题4:
A.somethingB.nothingC.anythingD.everything
小题5:
A.decisionB.chanceC.choiceD.destination
小题6:
A.excuseB.explanationC.instruction  D.example
小题7:
A.stoppedB.interruptedC.disturbed  D.prevented
小题8:
A.truckB.tractorC.secretary  D.policeman
小题9:
A.strangeB.terribleC.lucky  D.pleasant
小题10:
A.cuts upB.breaks upC.breaks downD.tears down
小题11:
A.cheerfulB.doubtfulC.puzzled  D.worried
小题12:
A.couldB.mustC.should  D.would
小题13:
A.wrongB.properC.perfect  D.smooth
小题14:
A.thus  B.stillC.hardly  D.even
小题15:
A.pick  B.sendC.meet  D.visit
小题16:
A.DespiteB.AlthoughC.Since  D.Though
小题17:
A.taughtB.touchedC.educated D.excited
小题18:
A.after all B.in allC.above all D.at all
小题19:
A.motivationB.inspirationC.observation D.appreciation
小题20:
A.says B.speaksC.talks D.tells