问题 选择题

设NA为阿伏加德罗常数,则下列叙述正确的是

A.标准状况下,2.24 L苯中含有0.3NA个碳碳双键

B.22.4LCl2通入水中充分反应,共转移NA个电子

C.1 L 1 mol/L的氯化铜溶液中Cu2+的数目小于NA

D.5.6g铁在0.1 mol氯气中充分燃烧,转移的电子数为0.3NA

答案

答案:C

题目分析:苯是液体,不能用V/Vm求其物质的量,且苯分子中只含有介于C—C键和C=C键之间的特殊共价键,不含碳碳双键,故A选项错误;虽然Cl2+H2OHClO+HCl~e中转移电子与氯气的系数之比等于物质的量之比,但是缺少“标准状况下”条件,不能用V/Vm求其物质的量,且氯气部分与水反应,氯气与水的反应是不能进行到底的可逆反应,说明不可能转移1mol电子,故B选项错误;由于c•V=n,则CuCl2的物质的量为1mol,虽然CuCl2=Cu2++2Cl中铜离子与氯化铜的系数之比等于物质的量之比,但是铜离子能少部分水解生成氢氧化铜,则平衡时溶液中铜离子小于1mol,故C选项正确;由于m/M=n,则铁的物质的量为0.1mol,2Fe+3Cl22FeCl3中氯气与铁的系数之比等于物质的量之比,则铁过量,氯气不足,应根据氯气的量计算转移电子的量,由于2Fe+3Cl22FeCl3~6e中转移电子与氯气的系数之比等于物质的量之比,则该反应中转移电子等于0.2mol,故D选项错误。

阅读理解

Once there was a child ready to be born. So he asked God, “They tell me you are sending me to earth tomorrow, but how am I going to live there being so small and helpless?”

God replied, “Among the many angels, I chose one for you. She will take care of you.” But the child wasn’t sure he really wanted to go. “But here I don’t do anything else but sing and smile, that’s enough for me to be happy.”

“Your angel will sing for you and will also smile for you every day. And you will feel your angel’s love and be happy.”

“And how am I going to be able to understand when people talk to me, ”the child continued,”if I don’t know the language that men talk? ”

God patted (轻怕)him on the head and said, “Your angel will tell you the most beautiful and sweet words you will ever hear.Your angel will teach you how to speak. ”

“And what am I going to do when I want to talk to you?”

But God had an answer for that question too. “Your angel will place your hands together and will teach you how to pray(祈祷). ”

“I’ve heard that on earth there are bad men,who will protect me? ”

“Your angel will defend(保卫)you even if it means risking her life! ”

“But I will always be sad because I will not see you any more, ”the child continued warily.

God smiled on the young one. “Your angel will always talk to you about me and will teach you how to come back to me, even though I will always be with you.”

At that moment there was much peace in Heaven, but voices from earth could already be heard. The child knew he had to start on his journey very soon. He asked God one more question, softly, “God, please tell me my angel’s name.”

God answered, “Your angel’s name is not hard to remember. You will simply call her _______.”

小题1:Which of the following can best replace the underlined word “warily”?

A.angrily

B.proudly

C.carefully

D.happily小题2:Which is the suitable word for the blank in the last paragraph?

A.Daddy

B.Grandpa

C.Mommy

D.Grandma小题3:The child asked God questions in the order of ________.

a. Who will protect me?

b. How can I understand what people talked about?

c. How can I live there being small and helpless?

d. What shall I do when I want to talk to you?

e. What’s my angel’s name?

A.c, d, b, e, a

B.d, a, e, c, b

C.b, d, c, a, e

D.c, b, d, a, e

名词解释