问题 推断题

(8分)A、B、C、D、E为初中化学常见的物质,其中A、C为金属单质,E为非金属单质,下图是它们之间的相互转化关系。请回答:

(1)反应①的基本反应类型是       ;反应②的基本反应类型是       

(2) A的化学式为   ; E的化学式为   

(3)写出物质E和B在加热条件下反应的化学方程式                 

(4)右图转化中产生无色气体E的原因是              

(5)写出反应③中发生反应的化学方程式:

_____________________________、____________________________。

答案

(1)化合反应  复分解反应 (2)Cu    H2(3)H2+CuOCu+H2O

(4)稀硫酸过量  (5)Fe+H2SO4=FeSO4+H2

红色物质是铜和氧化铁,A为金属单质,则A为铜;铜在加热的条件下生成氧化铜,则B为氧化铜,该反应由两种物质生成一种物质,反应类型为化合反应.氧化铜与稀硫酸反应生成硫酸铜和水,属于复分解反应,故X溶液为硫酸铜溶液,C为金属单质,能与硫酸铜溶液反应生成浅绿色溶液,故C为铁,铁与过量的硫酸反应生成氢气;

(1)由上述分析可知,反应①为铜在加的条件下与氧气反应生成氧化铜,属于化合反应;反应②为氧化铜与硫酸反应生成硫酸铜和水,属于复分解反应;

(2)A为铜,化学式为Cu;无色气体E为  H2

(3)E与B在加热条件下反应,即氢气与氧化铜在加热条件下反应,化学方程式为H2+CuOCu+H2O

(4)B与过量稀硫酸反应,即氧化铜与稀硫酸反应,生成硫酸铜和水;稀硫酸过量,则X溶液中有两种溶质,即生成的硫酸铜和过量的稀硫酸.铁与稀硫酸反应会生成氢气.

(5)③中的化学反应是铁与过量的稀硫酸反应产生氢气、铁与硫酸铜反应生成铜和硫酸亚铁,则化学方程式为:Fe+H2SO4=FeSO4+H2↑、Fe+CuSO4=FeSO4+Cu

选择题
阅读理解

What is your body language saying to your children? What is their body language telling you? I had the honor of hearing Jan Hargrave speak the other day. She is one of four body language experts in the US. Jan Hargrave says we lie with the right side of our brains, so it is our left hand that gives us away. A person touching his nose, pulling at his ear or rubbing his eye with his left hand might be lying to you. Also, a person who, in any way, crosses any fingers might just be lying. That, she says, is a holdover(遗留物) from childhood, when we crossed our fingers to signal that we didn’t mean what we were saying. When children squint(眨) their eyes, move their body away from you, or can’t seem to make good eye contact, you may need to ask for a little more clarification.

But just as important, children learn early how to read our body language when they are conversing(交谈) with us. Here are some acceptance signals to let them know you are interested when they are talking to you. Lean(倾斜) towards them. Make good eye contact and smile. Open your arms. Let your hands relax with the palms(手掌) showing: an open, upward palm always show acceptance. If your legs are crossed, make sure you are not crossing them away from your child. These are important because they signal to your child that you are focused on them and are accepting and welcoming them into your world.

By paying attention, we can open those lines of important communication with our children and we can see the truth more clearly. I think it would be a mistake to use these tools to lie, but we need to be aware of the signals we are giving so we can show people that they really do matter to us.

小题1:According to Jan Hargrave, we can tell whether a person is lying by _______.

A.observing his/her left hand’s movements.

B.looking at how he/ she crosses his/ her fingers

C.observing whether he/ she uses body language

D.making good eye contact with him/ her小题2:We can learn from the passage that body language _______.

A.is hard to master for children

B.can be understood in different ways

C.may help improve communication

D.is more likely to hide the truth小题3:Which of the following does NOT show acceptance to people?

A.Smile while making eye contact.

B.Open your arms to them.

C.Relax your hands with the palms showing.

D.Cross your leg away from them.小题4:In the last paragraph, the author seems to suggest that parents_______.

A.spend more time with their children

B.learn to read and use body language

C.pay attention to family communication

D.try to prevent their children from lying