问题 问答题

在观察“水的沸腾”实验中,当水温升到88℃时,每隔1min读一次温度计的示数,直到水沸腾3min后停止读数,数据记录如下表:

时间/min012345678
温度/℃8890949698989898

(1)安装该实验装置时,应该先固定图甲中A、B两铁圈中的______铁圈.

(2)实验如图甲所示,他在实验中的错误是:______.

(3)某次数据没有记录,当时温度计示数如图乙所示,此时温度计读数为______.

(4)根据表格中的数据,在图丙的小方格纸上画出水的温度随时间变化的图象.

(5)从图丙的图象可以看出水的沸点是______℃,水在沸腾过程中温度______(升高、不变或降低).

(6)小华和小杰虽然选用的实验装置相同,但水开始沸腾的时刻不同,他们绘制的沸腾图象如图丁所示,a、b两种图象不同的原因是水的______不同.

(7)小丽观察到沸腾前和沸腾时水中气泡上升过程中的两种情况,如图(a)、(b)所示,则图______是水沸腾时的情况.

答案

(1)安装该实验装置时,应该先固定图甲中B铁圈,它是用来固定烧杯的,而A是用来固定温度计的,所以需要先固定B;

(2)读数时,视线应与液体上表面相平;

(3)该温度计在量程范围内,最小刻度值为1℃,所以示数是90+2=92℃;

(5)通过丙图可以知道,水的沸点是98℃,沸腾时,温度不再改变;

(6)不同质量或体积的水,达到沸腾时所需时间不同;

(7)沸腾时小气泡越往上应该越大,这是由于液体压强的原因,(a)中的小气泡越往上越大,符合题意,而(b)图中的小气泡下面大上面小,不符合题意;

故答案为:(1)B;

(2)读数时视线没有与液柱上表面相平;

(3)92℃;

(4)如图所示;

(5)98、不变;

(6)水的质量(体积);

(7)(a).

完形填空
完形填空.
     The only highway to go to work that I had to drive was closed down due to an
accident on the bridge. A truck had hit the bridge and made it__1__for any traffic to
go over it. So in order to get to__2__I had to go a number of miles out of my way.
     Not being that__3__with this road and not knowing__4___all the pot holes in the
road were, I topped a hill and right in my path was a big pot hole. I felt and heard the
familiar sound of a flat tire. I__5__as far to the right as possible and stopped. I tried
several times to change the tire, but__6__.
     There I sat out in the country and no way to__7__with anybody. Just then, I looked
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and scared at the same time.
     I was straggling to get the__10__out when this man in the pickup pulled in behind me.
He got out to introduce himself and__11__to help me. When he got the spare out we
discovered that the spare is also__12__. He told me he would take the tire and have it
__13__and call my husband.
     We got the tire fixed__14__he took me back to my car. My husband was there
__15__us when we got back. The kind stranger stayed there and helped my husband
__16__the tire. After they finished we__17__thanked him and offered to pay him for
his__18__.
     I will never forget his words, "Your thanks is__19__enough pay and I just hope if this
ever happens to my wife or daughter someone will be so__20__as to help them. "
( )1.A. busy
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(     )4.A. where
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(     )12.A. flat
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( )14.A. but
( )15.A. listening to
(     )16.A. break
( )17.A. both
( )18.A. imagination
( )19.A. more than
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B. narrow
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C. fearful
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D. better than
D. wise

填空题