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1、 Module 5 A lesson in a lab Module 5 A lesson in a lab Look at the pictures. Do you know the names of the equipment？ test tube tongs balance crucible Bunsen burner potassium （钾） Lets get to know some metals? sodium(钠) calcium(钙) magnesium(镁) aluminum （铝） zinc（锌） iron（铁） copper （铜） Do you know how we
2、 can carry out an experiment successfully? What is the correct order to describe the stages of a scientific experiment? aim method result conclusion Passage A electrical adj. 用电的，与电有关的 electricity n. 电 equipment n. 设备，装备 react vi. （化学）反应 reaction n. 反应 oxide n. 氧化物 steam n. 蒸汽， 水气 Read the passage a
3、s quickly as you can and choose the best title for it . The Different Uses of Metals The Reaction of Metals The Reaction of Metals with Oxygen Passage A Read the passage again and answer the following questions : 1. Which of the metals in the table reacts the most with oxygen and water? potassium, c
4、alcium and sodium 2. What happens when you heat calcium in oxygen ? It begins to form an oxide. 3. Which metals react with steam ? Magnesium, aluminium and zinc 4. Does iron have a slow or fast reaction with steam? It has a slow reaction. 5. Does copper react with water? No, it doesnt . Read the pas
5、sage carefully and fill the chart on page 45. Read the passage again and complete the sentences. Passage B Passage B Whats happening to the nail in the pictures? Pre-reading: Read the passage and complete the table. cotton wool nails Iron does not rust. water Iron does not rust. water water Iron rus
6、ts. 1. In the first part of the experiment, the _ is dry ,not wet . 2. It shows that iron _ when the air is dry . 3. In the second part of the experiment, you must _ the water to make sure there is no _ in it . air does not rust boil air 4. You add _ to the water because this keeps _ out of it. 5. I
7、t shows that _ does not rust in water that has no _ in it . some oil air nail air Complete the passage with proper words according to passage A and B It is hard to think of a world without metals. Different metals have different metals have different uses, for example, iron can be used in _ equipmen
8、t. But above all we should know whether it electrical will _ under different conditions otherwise it will keep the equipment from working well. As we all know, if iron is heated in oxygen, it will react slowly but will not form an _. react oxide On the other hand , if it is put together with water o
9、r _, there will a _ reaction. Next lets do an _ to support the above . First , get a test tube filled with water and put it over the _ to _ for three minutes . steampartial experiment bunsen burnerboil Then put three or four clean nails in the water with some oil added to it and leave the tube for o
10、ne week . What happens? The iron does not _ in air- free water. Another experiment , if you put the nails in the tube with the air in it for one week, then what happens ? Iron rusts in _ water . rust ordinary Read about an incident during a chemistry lesson and choose the best summary. Reading on P9
11、3 1. A student didnt follow the instructions carefully . He took the wrong liquid from the cupboard and nearly poisoned the class . 2.The chemistry teacher was demonstrating an experiment when she heated a poisonous liquid . There was so much smoke that the students had to leave the room . 3. A stud
12、ent was doing a chemistry experiment when he accidentally heated the wrong liquid and caused an incident in the laboratory . Read the passage again and answer the questions : 1. What substances were they using ? Baking soda and hydrochloric acid 2. What substances were the students making ? Salt 3.
13、How can they make the reaction quicker ? By making the mixture hotter. 4. What mistakes did Paul make? He used the wrong liquid . 1. Why did he make the mistake ? Because there was no label on the bottle . 2. What happened when Paul heated the liquid ? It formed a thick cloud of white gas. 3. Why di
14、d the teacher send the students out of the room? Because the liquid was acrylamide and the gas was poisonous . 4. What lesson did the incident teach the students and the teacher? Never to leave a bottle without a label in the chemistry lad . 1. Learn the new words by heart. 2. Read the passage A and
15、 B and try to retell it . Assignments for you (language points) 镜头再现 1. The earth is forty-nine times larger than the moon . 2. The more books I read, the more information I learn. 上面两个句子中重点强调的是比较级。 这一语法现象我们在初中已学过,现在 我们对这一语法进行总结。 三种比较句型的转换： 1) A+be+four times +比较级than +B 2) A+be+four times+as+adj/adv+as +B 3) A+be+four times +the +N of B The well is four times deeper than that one. = The well is four times as deep as that one. =The well is four times the depth
