Vt. 混合

n. 混合物

··· ··· 的混合物（词组）

mix

mixture

a mixture of··· ···

n. 演讲n.演讲者，讲师

lecture

lecturer

1.

2.

3. Vt.使惊讶astonish

astonishing

astonished

令人吃惊的

吃惊的，惊讶的

n.电electricity

adj.与电有关的，电学的

adj.带电的，导电的 electric

electrical

电器设备（词组） electrical equipment

5. 设备，装备 [U] equipment

n. 电学家，电工 electrician

4.

最新设备（词组） the latest equipment

6.在 ···顶部7.在 ···底部8.得出结论9.科学实验10.没有空气的水11.试管12.按顺序整理 /摆放

at the top of

at the bottom of

draw/ come to/ arrive at a conclusion

scientific experiment

air-free water

a test tube

put sth. In order

Put everything in order before you leave the room

离开房间前把所有的东西都整理好

Potassium 钾 Sodium 钠

Calcium 钙 Magnesium 镁

Aluminium 铝 Zink 锌

Iron 铁 Copper 铜

Match the metals with pictures

popotatassiumssium

sodiumsodiumcalciumcalcium magmagnenesiumsiumalualumiminiumnium zinczincironiron

coppercopper

Passages A

Fast-reading

Choose the best title for the passage

A. Different Uses of Metals

B. The Reaction of Metals

C. The Reaction of Metals with OxygenTip : Pay attention to the first and the last sentence to get the

best title

Passages A

Careful reading1. Which metal reacts the most with oxygen and

water?

2. What should we know when we use metals?

3. Which metals react with steam?

4. Does iron have a slow or fast reaction with steam?

5. What happens when you heat magnesium in oxygen?

It burns to form an oxide.It burns to form an oxide.

Magnesium, aluminium, zincMagnesium, aluminium, zinc

Slow.Slow.

Potassium, Calcium, Sodium

react Vi （化学）反应reaction n. 反应部分反应

和 ···有反应

对 ···有反应

对 ···有影响，起作用

反抗，对抗

partial reaction

Iron reacts with water and air to produce rust

How did Wilson react to your idea?

Many people react against tax increase(增税 )

react on/upon

• It is important toIt is important to know how they know how they react with different substancesreact with different substances..

It is +adj.+ (for sb) +to do sth

对于我来说回答这个问题很简单It is easy （ for me ） to answer this question. TranslationTranslation:

对于我们来说学好英语很重要It is important （ for us ） to learn English well!

A Simple Scientific Experiment

• scientific experiment

Apparatus [,æpə‘reitəs]

设置，装备，仪器

Bunsen burnerBunsen burner

test tubetest tube

tube holdertube holder

Put these words in the correct order to describe

the stages of a scientific experiment.(排序 )

Conclusion aim result method

Read passage B to check the answer

Passages B

Fast-reading

Conclusion

Aim

Method

Result

the stages of a scientific experiment

1.2. 3.

4.

cotton woolcotton wool

nailsnails

waterwater waterwater

waterwater

The nails The nails haven’t rusted.haven’t rusted.

The nails doThe nails do

not rust.not rust.

The nails The nails rust.rust.

Task: read carefully and then fill in the table.

Iron doesn’t rustIron doesn’t rust in dry air.in dry air.

Iron doesn’t rustIron doesn’t rust in air-free air.in air-free air.

Iron rusts in Iron rusts in ordinary air.ordinary air.ConclusionConclusion

Summary• In the first part of the experiment, the ____

is dry. It shows that iron ___________ in dry air.

• In the second part, you must _____ the water to ______ _______ that there is no air in it. ______ some oil to the water can ______ the air out of it. It shows that _____ don’t rust in ____________ water.

• In the third part, _______ the tube with water. It shows that they rust in _________ water.

airair

doesn’tdoesn’t rustrust

boilboilmakemake suresure

AddingAddingkeepkeep nailsnails

air-freeair-free

half-fillhalf-fill

ordinaryordinary