问题 填空题

完成下列反应的化学方程式,并回答有关问题:

(1)碱式碳酸铜受热分______,该反应属于______(选填“吸热”或“放热”)反应;

(2)利用硝酸银溶液证明Ag和Cu的金属活动性:______,通过此实验说明,Ag的金属活动性______(选填“>”、“<”或“=”)Cu的金属活动性;

(3)将过量的稀硫酸逐滴加入至一定量的氢氧化钡溶液中:______,在该反应过程中,溶液的导电性变化情况为______.

(4)CO2气体通入澄清石灰水后,溶液变浑浊,继续通入CO2气体后,能与沉淀发生化合反应生成一种含碳酸氢根离子的可溶性盐,从而使溶液再次变澄清.相应变化的化学方程式:______、______.

答案

(1)碱式碳酸铜在加热条件下反应生成氧化铜、水和二氧化碳.

该反应的化学方程式为:Cu2(OH)2CO3

  △  
.
 
2CuO+H2O+CO2↑.

该反应过程中由于需要提供热量,因此属于吸热反应.

(2)铜与硝酸银溶液反应生成硝酸铜和银,该反应可以证明银和铜的金属活动性.

该反应的化学方程式为:Cu+2AgNO3=Cu(NO32+2Ag.

通过此实验说明,Ag的金属活动性<Cu的金属活动性.

(3)稀硫酸与氢氧化钡反应生成硫酸钡沉淀和水.

该反应的化学方程式为:Ba(OH)2+H2SO4=BaSO4↓+2H2O.

在该反应过程中,溶液的导电性变化情况为先减弱,再加强.

(4)二氧化碳与氢氧化钙反应生成碳酸钙沉淀和水.

该反应的化学方程式为:Ca(OH)2+CO2=CaCO3↓+H2O.

该可溶性盐是碳酸氢钙.碳酸钙、水和二氧化碳反应生成碳酸氢钙.

该反应的化学方程式为:CaCO3+H2O+CO2=Ca(HCO32

故答案为:

(1)Cu2(OH)2CO3

  △  
.
 
2CuO+H2O+CO2↑;吸热

(2)Cu+2AgNO3=Cu(NO32+2Ag;<

(3)Ba(OH)2+H2SO4=BaSO4↓+2H2O;先减弱,再加强

(4)Ca(OH)2+CO2=CaCO3↓+H2O;CaCO3+H2O+CO2=Ca(HCO32

阅读理解

Born in America in 1898, William was an extraordinary boy, gifted with an amazing IQ between 250 and 300. The genius went to a grammar school when he was only 6 years old and graduated just within 7 months. At the age of 11, he became the youngest student of the Harvard University. He graduated with high scores at the age of 16 and entered Harvard Law School at 18.

Gifted with an amazing IQ between 220 and 230, Terence Tao makes it to this list of the people with the highest IQ in the world. Born in Adelaide, Australia in 1975, this genius first displayed his incredible intelligence at a mere age of 2, when he managed to solve basic arithmetic questions on his own. At the age of 16, he graduated with both Master's and Bachelor's degrees at the Flinders University. He has been considered as ''Mr. Fix it " by Charles Fefferman, who is a professor of Mathematics at Princeton University, and many other mathematicians want to interest him in their problems.

This 31-year-old Japanese-American astrophysicist lands him third in this list. At the age of 12, Christopher Hirata already worked on college-level courses, around the time most of us were just in the 7th grade. At the age of 13, this gifted kid became the youngest American to have ever won the gold medal in the International physics Olympiad.

At the age of 16, he was already working with NASA on its project to conquer planet Mars. After he was awarded the Ph.D. at Princeton University, he went back to California Institute of Technology.

The next person with very high IQ is Albert Einstein. With an IQ between 160 and 190, Albert Einstein is the genius behind the theory of relativity, which has had great impact on the world of science. He possessed such an amazing ability that after his death, researchers were eager to preserve and make research on his brain in search for clues to his exceptional brilliance, which to this day, has remained a mystery.

小题1:About William, which of the following is true?

A.His IQ reached between 220 and 230.

B.At the age of 16, he graduated from a grammar school.

C.At the age of 6, he graduated with both Master's and Bachelor's degrees.

D.At the age of 11, he became the youngest student at the Harvard University.小题2:How many people with remarkable IQ are mentioned in the passage?

A.3

B.4

C.5

D.6小题3:Who once worked on the project to conquer planet Mars?

A.William

B.Terence Tao

C.Christopher Hirata

D.Albert Einstein小题4: From the passage we can know that______.

A.when William graduated from the Harvard University, he got the highest scores

B.at the age of 2, Terence solved basic arithmetic questions on his own

C.Christopher Hirata is a Japanese

D.researchers have found out why Albert Einstein was so brilliant