3. 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

4. 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

5. 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

6. Potassium 钾 Sodium 钠 Calcium 钙 Magnesium 镁

7. Aluminium 铝 Zink 锌 Iron 铁 Copper 铜

8. Match the metals with pictures potassium sodiumcalcium magnesium aluminium zinc iron copper

9. 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 Oxygen Tip : Pay attention to the first and the last sentence to get the best title

10. Passages A Careful reading 1.Which metal reacts the most with oxygen and water?reacts 2.What should we know when we use metals?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. Magnesium, aluminium, zinc Slow. Potassium, Calcium, Sodium

11. 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

12. It is important to know how they react with different substances.It is important to know how they react 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. Translation Translation : 对于我们来说学好英语很重要 It is important （ for us ） to learn English well!

13. A Simple Scientific Experiment scientific experiment Apparatus [,æpə‘reitəs] 设置，装备，仪器 Bunsen burner test tube tube holder

14. 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

15. Conclusion Aim Method Result the stages of a scientific experiment 1. 2. 3. 4.

16. cotton wool nails water water water The nails haven’t rusted. The nails do not rust. The nails rust. Task: read carefully and then fill in the table. Iron doesn’t rust Iron doesn’t rust in dry air. in dry air. Iron doesn’t rust Iron doesn’t rust in air-free air. in air-free air. Iron rusts in ordinary air. Iron rusts in ordinary air. Conclusion

17. 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. air doesn’t rust boil make sure Adding keep nails air-free half-fill ordinary