问题 问答题

小凡同学在做“观察水的沸腾”实验中

(1)他的实验装置如图甲所示,其中的错误是______.

(2)纠正错误继续进行实验,当水温上升到84℃时,每隔1min记一次温度计的示数,直到水沸腾4min后停止读数,其数据记录如下表所示,第三次数据没有记录,当时温度计示数如图乙所示,请将数据填在表格里.

时间/min01234567
温度/℃84889699999999
(3)请根据表格中的数据,在图丙中的坐标图上画出水的温度与时间变化的图象.

(4)根据实验测得的沸点可知此时的气压比一个大气压______.

答案

(1)经分析温度计的玻璃泡碰到了容器底,影响测量结果.

(2)零刻度在温度计的下方,液柱远离零刻度是零上,每一个大格代表10℃,每一个小格代表1℃,示数是92℃.

(3)在图象上描出(0,84)(1,88)(2,92)(3,96)(4,99)(5,99)(6,99)(7,99),用光滑的曲线连接起来.如图.

(4)水的沸点跟气压有关,气压越高,沸点越高.

1标准大气压下水的沸点是100℃,此时水的沸点是99℃,气压越高,沸点越高,所以此时气压比1标准大气压低.

故答案为:(1)温度计的玻璃泡碰到了容器底;(2)92;(3)如上图;(4)低.

阅读理解

阅读理解。

                                             Who killed Martin Luther King?

    A man shot Martin Luther King in Atlanta on 4th April,1968. He drove away in a car. Who was he?The police found“Harvey Lowmeyer's”gun and“John Willard’s”car. So what was this man's real name?

Marks on the shirt and the car were sent to the FBI in Los Angeles. 3,000 detectives questioned people. At last one found a photo of“Galt”. Then detectives in Atlanta found a fingerprint(指纹). It was on a map

in“Galt’s”room in a small hotel. One fingerprint was enough, James Earl Ray's fingerprints were already on the FBI cards. The police watched railway stations,hotels and airports. 3,000 detectives were trying to find Ray without success. The Canadian police were helping,too. They looked at 240,000 photos in

their Passport Office.Then they found one of“Ramon George Sneyd”,“We gave this man a passport

last month,”they said. “He went to London on 2nd May. ”The man was wearing thick glasses,but he

looked like Ray.Then on l8th June,a detective at London Airport saw Sneyd's name on a passenger list.

   It was the end of the biggest manhunt in history. The FBI spend 1. 4 million dollars,but they got their

man.

1.The key to settle the case was probably the murderer’s_____.

A.car              

B. fingerprint

C. gun              

D. shirt

2. It took the police ______to catch the murderer.

A. 65 days

B.more than 2 months    

C. eight weeks

D. three months

3. Martin Luther King's murderer used the name of_______.

A. Harvey Lowmeyer when he bought the gun    

B. Jane Willard when he paid for the car    

C. Eric Starvo Galt when he lived in Los Angeles    

D. James Earl Ray when he carne to Atlanta

4. The detective at London Ajrport caught Ramon George Sneyd because_______.

A.Sneyd had a Canadian passport    

B. it was sure that he was the passenger    

C.Sneyd’s name was not on the passenger list

D.Sneyd was wearing glasses

5. What is TRUE according to the passage?

A.The police didn't get the murderer.     

B. The police got the man in Los Angeles.    

C. The murderer changed his name several times.    

D. The FBI looked at 340,000 photos in the Passport Office.

单项选择题