最新高三英语公开课教案

Module4 Unit11 Media

Teaching Aims:

1.To review some key words and phrases in this unit.

2.To improve students’ reading skills.

Teaching Difficulties:

How to lead students to talk about something about media.

Teaching Importances:

How to let students master these key words.

Teaching Aids:

A computer.

Teaching Process:

Step1: Greetings

Greet the whole class as usual.

Step2: Lead in

Everyone is connected to some form of media, so how do people contact with

each other nowadays? How about you?

(suggested answers: QQ ; MSN ; Blog ; Twitter ; Facebook ; or even

Pinterest)

Step3: Warm up

Ask students to fill in the blanks with some key words listed in Exercise 1.

Then lead them to read several times.

Step4: Presentation

To review the important usages of words on the book and do the exercises.

Notes: demand to do / on demand/ in demand/ demand that-

arise & raise & rise

blame sb. for sth./ blame sth. on

employ sb. in doing sth./ to do sth./ as…

pretend to do/ that-

Step5: Practice

Ask students to finish these exercises and check answers one by one.

Step6: Conclusion:

1.To read the passage on the blackboard together and write down the useful phrases

on the notebooks.

2.To give the homework to students.

第二单元我们周围的空气

课题1 空气

一、法国科学家拉瓦锡用定量的方法研究了空气的成分，通过实验得出：空气是由氧气和氮气组成的，其中氧气约占空气总体积的1/5。

二、空气中氧气成分的测定：

1.药品；红磷

2、实验现象：红磷燃烧放出大量的热，产生大量的白烟

3、实验结论：氧气约占空气总体积的1/5；氧气有助燃性；空气中还有4/5体积的气体不可燃烧，也不助燃也不溶于水

4、原理:

5、实验误差分析

（1）测得氧气含量小于1/5

A、红磷量不足，氧气没有全部消耗完

B、集气瓶（装置）还没有冷却到室温就打开弹簧夹

C、装置的气密性不好

（2）测得氧气含量大于1/5

A、实验前没有关闭止水夹或没有夹紧，气体受热后膨胀从导管逸出

B点燃红磷后没有迅速伸入集气瓶并盖紧瓶盖（瓶内气体逸出）

思考：可否换用木炭、铁等物质？

答：不能用木炭燃烧产生了气体，

不能用铁（铁在空气中不能燃烧）