问题 选择题

用NA表示阿伏加德罗常数的数值,下列说法正确的是

A.同温同压下,NA个NO与NA个N2和O2的混合气体的体积不相等

B.1.00 mol/L的硫酸溶液中含有氢离子的数目为2NA

C.标准状况下22.4 L水中含有水分子数目为NA

D.常温常压下,17g NH3的电子数为10NA

答案

答案:D

题目分析:A中根据阿伏伽德罗定律,同温同压下,具有相同分子数的任何气体具有相同的体积。B中没有告诉硫酸的体积,所以不能确定硫酸的物质的量即氢离子的数目。C中水在标准状况下是固体,22.4L水的分子数目不是NA个。

点评:阿伏伽德罗常数是历年高考的“热点”问题。多年来全国高考化学试题出现的几率为100%。这双因为它既考查了学生对物质的量与粒子数、质量、气体体积和物质的量浓度之间的关系,又可以与物质结构、盐类水解、弱电解质的电离等其他的概念性知识点结合成综合性习题。

阅读理解

I grew up in a small town. My father raised chickens and ran a construction company. I was only 10 years old when my dad gave me the responsibility of feeding the chickens and cleaning up the stable. He believed it was important for me to have those jobs to learn responsibility. Then, when I was 22, I found a job in Natchbill at a country music club called the Natchbill Palace, I washed dishes and cooked from 4:00 p.m to 9:00 p.m and then went on stage and sang until 2:00 in the morning. It wasn’t long before I became known as a singing cook. I had been rejected(拒绝) so many times by record companies that it was hard not to be discouraged. One night, a woman executive(董事) from a company named Warner Brothers Records came to hear me sing. When the show was over, we sat down and talked and after she left, I said to myself it was one more rejection. A few weeks later, my manager received a phone call—Waner Brothers wanted to sign me to a record deal. Soon after, I release(发行) my first record in June 1986. It sold over 2 million copies. My best efforts had gone into every job I’ve ever held. It was the sense of responsibility that made me feel like a man. Knowing that I had done my best filled me with pride. I still feel that way today, even though I have become a well-known singer.

小题1:Why was the writer once known as the singing cook?

A.Because he was a cook at a country –music club.

B.Because he sang for guests while he worked as a cook.

C.Because he often sang while cooking.

D.Because he liked singing better than cooking.小题2:Who first recognized his talents and helped make his career successful?

A.Warner Brothers

B.His manager

C.His father

D.A business woman小题3:What made the writer proud of himself?

A.His ability to live independently.

B.His sense of responsibility in whatever he did.

C.His courage in the face of rejections.

D.His hard work in his early days.

单项选择题