Module5 A Lesson in a Lab教案

then design the following questions and ask the students to discuss them in groups:
1. are you interested in doing scientific experiments?
2. suppose you want to do a chemical experiment about some metals, do you think it is necessary to know about how they react with other substances?
3. in order to carry out an experiment successfully, what should you prepare for it?
this step is to warm up the students and raise their interests to speak english in class. because all these questions are very close to the students’ daily life and studying
  step 2：pre-reading
teacher: since you are interested in doing scientific experiments, now let’s get to know some vocabulary and knowledge related to science and experiments.
at the same time i can type out some pictures about some metals on the screen with the help of the computer as follows:

⑴potassium(鉀)      ⑵sodium(鈉)        ⑶calcium(鈣)      ⑷magnesium(鎂)  

⑸aluminium(鋁)       ⑹zinc(鋅)         ⑺iron(鐵)           ⑻copper(銅)

as i type out each of the above pictures, i can ask the students like this:  what’s this? and what can it be used for?
at this moment the students’ interests are probably approaching a climax. so i further ask them like this: do you want to know more about these metals? and do you know how we can use these metals better?  well, this is what we’ll study very soon.   
this step is employed to create a language environment for students’ communication and arouse their interests in reading passage a and passage b on page 44-45
  step 3:  reading
    passage a
t: well, let’s read through passage a with the tape of it very quickly to try to catch its main idea. then finish activity 2 on page 44 and give your reasons.
next, ask the ss to read passage a very carefully to find out the answers in activity 3 on page 44. finish this activity by multi-media computer. it can be designed as follows:
1. which of the metals in the table reacts the most with oxygen and water?
    potassium, calcium and sodium.
2. what happens when you heat calcium in oxygen?
    it burns to form an oxide.
3. which metals react with steam?