问题 问答题

实验小组的同学为探讨过氧化钠(Na2O2)与二氧化碳的反应,用如图所示的装置进行实验.通入CO2气体,将带火星的木条放在C的导管口中,木条复燃.请回答下列问题:

(1)根据木条复燃的情况,推测Na2O2与CO2发生的反应,写出化学方程式______.

(2)请设计一种实验方案验证该反应的另一种产物______

______.

答案

(1)根据质量守恒定律,化学反应前后,元素的种类不变,生成的另一种物质必含碳、钠元素,可能含氧元素,根据学过的物质推测为碳酸钠,所以本题答案为:2Na2O2+2CO2=2Na2CO3+O2

(2)证明碳酸钠的存在就是涉及到碳酸盐的检验,可以采用向所得固体中加入酸液,观察是否生成能使澄清石灰水变浑浊的气体,所以本题答案为:取白色固体,加稀盐酸,产生能使澄清石灰水变混浊的气体,证明推测正确的;反之,推论不正确.

阅读理解

As I grew older, my dad and I grew further apart. We always had totally different opinions. He thought that college was a waste of time, but for me it was important to finish college. He wanted me to work my way to the top as he had done in his field, but I wanted a different life. There was a time when we did not talk with each other.

A few months ago, I heard that my 84-year-old dad was in poor health. When he called and asked whether I could move from Colorado back to Tennessee to help him, I knew he was seriously ill. I am his only child and so it was time to meet my father’s requirement.

Two weeks after moving back, we bought a boat and started fishing again. Fishing was one of the few things that we did while I was young and that we both enjoyed. It is strange but true that as we are fishing we are able to put things that have kept us apart for so many years behind us. We are able to talk about things that we have never talked about before. Fishing has been healing the old wounds that have kept us apart. 

It is not important how many fish we catch. It is about enjoying the relationship that we have not had for years. I’m 62 and he is 84. When we are on the lake fishing, it is like two kids enjoying life. It is far better to find a way to put the unhappy past behind. I am so lucky to spend the happy time with my father in his last years. Now my heart is filled with love. A smile always graces my lips.                                                      

小题1:The author and his father became further apart because       .

A.they lived very far from each other

B.they had different views on things

C.they only communicated by phone

D.they seldom went to see each other小题2:Why did the author come back to Tennessee?

A.Because his father invited him to go fishing.

B.Because he decided to live in a different city.

C.Because his father is ill and needs caring.

D.Because he regretted being rude to his father.小题3:For the author, fishing with his old father       .

A.helps cure his father’s disease

B.is a good way to get close to nature

C.makes him realize the importance of relaxation

D.provides a chance for them to communicate小题4:What can be the best title for the text?

A.Fishing brings us together

B.Forgiving is difficult

C.Memories of old days

D.My beloved father

名词解释