问题 选择题

2010年诺贝尔物理奖授予发现石墨稀的开创性研究者,石墨稀是首个发现的二维空间材料,从石墨材料中剥离制得。金刚石、石墨、C60和石墨稀的结构示意图分别如下图所示,下列说法正确的是(   )

A.将石墨剥离制成石墨稀发生了物理变化

B.这四种物质碳原子的排列方式相同

C.这四种物质完全燃烧后的产物都CO2

D.这四种物质的结构中都是每个碳原子连接3个碳原子

答案

答案:C

题目分析:根据题目提供的信息结合所学化学知识分析判断。

A、化学变化的特征是有新物质生成,根据题意可知石墨和石墨烯是不同物质,所以发生了化学变化,错误;

B、金刚石为正八面体的立体结构,石墨为六边形的平面结构,它们的碳原子排列方式不同,错误;

C、由于四种物质都是由碳元素组成的,所以完全燃烧时都只生成二氧化碳,正确;

D、石墨的六边形结构中每个碳原子与周围3个碳原子连接,而金刚石的正八面体结构使得每个碳原子与周围4个碳原子连接,错误。故选C

点评:金刚石与石墨的物理性质差异很大,是因为它们的碳原子的排列方式不同;二者的化学性质相似,是因为它们的组成元素相同。

阅读理解

“If you want to see a thing well, reach out and touch it!”

That may seem a strange thing to say. But touching things can help you to see them better. Your eyes can tell you that a glass ball is round. But by holding it in your hands, you can feel how smooth and cool the ball is. You can tell how heavy the glass it. When you feel all these about the ball, you really see it.

With your skin, you can feel better. For example, your fingers can tell the difference between two coins in your pockets. You can feel a little drop of water on the back of your hand, too. You can even feel sounds against your skin. Have you wanted to know why some people like very loud music? They must like to feel the sounds of music.

All children soon learn what “Don’t touch!” means. They hear it often. Yet most of us keep on touching things as we grow up. In shops, we touch things we might buy: food, clothes. To see something well, we have to touch it.

The bottom of our feet can feel things, too. You know this when you walk on warm sand, cool grass or a hard floor. All feel different under your feet.

There are ways of learning to see well by feeling. One way is to close your eyes and try to feel everything that is touching your skin. Feel the shoes on your feet, the clothes on your body, the air on your skin. At first, it is not easy to feel these things. You are too used to them.

Most museums are just for looking. But today some museums have things for visitors to touch. Their signs say, “Do touch!” there you can feel everything on show.

If you want to see better, reach out and touch. Then you will really see.

小题1: By touching things ___________.

A.you will have a strange feeling

B.you will learn how to reach out your hand

C.you can see them well

D.you can tell what colors they are小题2:According to the passage, which of the following CANNOT feel things?

A.Skin.

B.Fingers.

C.Feet.

D.Eyes.小题3: Why does it say “At first, it is not easy to feel these things?” Because ___________

A.the things are used by people too

B.people feel the things too much

C.people know how to use the things

D.these things are familiar to you小题4:You can see the sign "Do touch!"_____________________.

A.in every museum

B.in most museums

C.in some museums

D.only in one museum小题5:The best way to see the world well is to ___________________.

A.touch by feeling

B.see or to feel

C.read

D.see and feel

单项选择题