问题 实验题

科学探究是奇妙的过程,请你一起参与实验探究,并填写下列空白:

[提出问题]小松同学用“双氧水”(过氧化氢溶液)消洗伤口时,不小心将过氧化氢溶液滴到水泥地板上,发现有大量气泡产生。小松联想到自己曾经用二氧化锰做过氧化氢分解的催化剂,他想,水泥块能否也可作过氧化氢分解的催化剂呢?于是他到附近建筑工地取回一些小水泥块,并用蒸馏水浸泡、冲洗、干燥,并进行以下探究。

[猜想]水泥块能作过氧化氢分解的催化剂。

(1) [实验验证]

[结论]水泥块能加快过氧化氢的分解速率,故水泥块能作过氧化氢分解的催化剂

(2)[讨论与反思]小芳认为:仅凭上述两个实验还不能证明水泥块为过氧化氢分解的催化剂,她觉得需要增加一个探究实验:探究_____________________。

(3)[实验步骤]①准确称量水泥块的质童;②完成实验二;③待反应结束,将实验二试管 里的物质进行过滤,洗涤,______________,_____________;④对比反应前后水泥块质量。

[分析]如果水泥块反应前后质最不变,则说明水泥块可以作过氧化氮分解的催化剂。

(4)但小华认为,要证明小松的猜想,小芳的补充实验还是不足够,还需要再补充一个探究实验:探究_____________________________________________________________。

答案

(3)实验一:将带火星的木条伸入装有过氧化氢溶液的试管中 ;实验二:加入水泥块能加快过氧化氢溶液分解速率

(5)水块的质量在反应前后是否改变);干燥;称量

(6)水泥块的化学性质在反应前后是否改变。

阅读理解

阅读理解。

     Most people know that Marie Curie was the first woman to win the Nobel Prize, and the first person to

win it twice. However, few people know that she was also the mother of a Nobel Prize winner.

     Born in September, 1987, Irene Curie was the first of the Curies' two daughters. Along with nine other

children whose parents were also famous scholars, Irene studied in their own school, and her mother was

one of the teachers. She finished her high school education at the College of Sévigné in Paris.

     Irene entered the University of Paris in 1914 to prepare for a degree in mathematics and physics. When

World War I began, Irene went to help her mother, who was using X-ray facilities (设备) to help save the

lives of wounded soldiers. Irene continued the work by developing X-ray facilities in military hospitals in

France and Belgium. Her services were recognized in the form of a Military's Medal by the French

government.

     In 1918, Irene became her mother's assistant at the Curie Institute. In December 1924, Frederic Joliot

joined the Institute, and Irene taught him the techniques required for his work. They soon fell in love and

were married in 1926. Their daughter Helene was born in 1927 and their son Pierre five years later.

     Like her mother, Irene combined family and career. Like her mother, Irene was awarded a Nobel Prize,

along with her husband, in 1935. Unfortunately, also like her mother, she developed leukemia because of her

work with radioactivity (辐射能). Irene Joliot-Curie died from leukemia on March 17, 1956.

1. Why was Irene Curie awarded a Military Medal?

A. Because she received a degree in mathematics.

B. Because she contributed to saving the wounded.

C. Because she won the Nobel Prize with Frederic.

D. Because she worked as a helper to her mother.

2. Where did Irene Curie meet her husband Frederic Joliot?

A. At the Curie Institute.

B. At the University of Paris.

C. At a military hospital.

D. At the College of Sevigne.

3. When was the second child of Irene Curie and Frederic Joliot born?

A. In 1932.

B. In 1927.

C. In 1897.

D. In 1926.

4. In which of the following aspects was Irene Curie different from her mother?

A. Irene worked with radioactivity.

B. Irene combined family and career.

C. Irene won the Nobel Prize once.

D. Irene died from leukemia.

单项选择题