Unit 16 Scientists at work

Tell me what it is.

1.Describe what you see in each picture. What is it about? 2.What are the names of the school subject in which you study science? 3.Give an example of what you learn about for each field of science?

in a chemistry lab doing an experiment

an English-Chinese dictionary, an English book called Hamlet and a notebook

in a physics lab doing an experiment

in a biology lab looking at something through a microscope

chemistry  science of elements 原理 and their laws 规律 of combination 结合 and change element 元素 substance 物质 gas, liquid, solid chemical change chemistry experiments In chemistry we learn about the way different liquids and materials react with each other. Eg. If you put a piece of metal into a glass containing a strong acid, it will dissolve.

physics  science of matter and energy and of interactions 相互作用 between the two matter power energy physical change physics experiment In physics we learn about the laws of the universe. Eg. About Newton and the reason why all things on earth fall down. Eg. About electrification by friction.If a rubbed ruler is put near a small piece of paper, the paper will be attracted onto the ruler.

Biology 生物学  science of life and of living organisms 生物体 animal plant living things gene 遗传因子 cell 细胞 protein 蛋白质 biology experiment In biology we learn about life on earth. Eg. By looking at the structure 结构 of cells

When you are doing experiments, What should you pay attention to?Can you tell me your ideas? Do some listening practise. Let’s see what Mrs Zhu talks about to the students

Pay more attention to different structures of giving instructions DosDon’ts Follow teacher’s instructions Be careful about / when… Always listen carefully to… Clean…away Leave …clean and neat You should tie…up Remember that… Make sure that… Don’t come into / without … Don’t touch… / unless… Don’t throw… / unless… Don’t forget to… Never put / nose directly into.. Never put /fingers into/ and taste…

Listening Mr. Deng: Everybody listen carefully! Today Mrs.Zhu will explain about the safety instructions for the lab. If you have any questions, you can raise your hand. Mrs.Zhu: For experiments that are done in this lab, everybody should remember: Safety comes first! This is very important, because the experiments are fun and very interesting, but we don’t want any accidents. First of all, don’t come in here without your teacher.

Once you are in here, follow your teacher’s instructions. When you come into the lab,students with long hair should tie it up, or put their hair under their clothes. Always listen carefully to your teacher’s instructions and don’t touch anything, unless your teacher tells you to. Mr. Deng: Can you explain a bit more about doing experiments? Mrs.Zhu: Sure. Never put your nose directly into a glass or over a bottle.Gases can be very

dangerous. Instead, you should wave some air in your direction and carefully smell it. Never put your fingers into glasses and never taste anything! When working with fire, be careful about the flame.When working with electricity, make sure your hands are dry. When anything gets into your month or eyes, immediately wash with a lot of water. Remember that the classroom isn’t a playground. Don’t throw things or start

playing. Sun Yao: What about when we leave? Mrs. Zhu: When class is over, clear everything away and leave the classroom neat and clean. Before leaving the classroom, wash your hands with water and soap. Don’t forget to turn off the lights and shut the windows.

1. Listen to the tape. Tick the things that Mrs. Zhu talks about. ( ) safety in the lab ( ) gloves ( ) long hair ( ) experiments ( ) shoes ( ) liquids ( ) car accidents ( ) gases ( ) flames √ √ √ √ √ ( P22 ) Answers:

2. Follow the teacher’s instructions. 3. Bottles may contain dangerous gases. 4. Immediately wash your eyes with a lot of water. 5. Clear everything away and leave the classroom neat and clean. Wash your hands with water and soap. Turn off the lights and shut the window. 1. Safety comes first! 2. Please check the answers:

air conditioner nuclear energy laptop sewing machine electric washing machine spaceship

VCD player vacuum cleaner electric iron

clone maglev train

InventionsAdvantagesDisadvantages maglev train 1.It is fast. 2.It’s clean and does not pollute the air. 3.It does not make any noise. 1.It’s a waste of money. 2.It’s too expensive. The advantages and disadvantages of maglev train

inventions Cloning Nuclear energy Computers Space flights AdvantagesDisadvantages 1.can help women have babies 2.can save some rare species 3.can help medical research 1. clean and not pollute the air 2. can be used to make electricity 3. be a limitless resource 4. useful in military affairs 1.useful in many fields 2.important for science 3.make communication faster 4.can keep information better 1. useful in scientific research Eg.put communication satellites in to space 2.go on exciting space travels 1.it is not natural to make people 2.dangerous; If it is not used properly, it can bring some side effects to the whole society. 1.unsafe to all life if not controlled 2.can be expensive to build/repair 3.not easy to deal with 1.unsafe because of viruses 2.use it for other things and bring bad effects to people and society if not used properly 1.expensive and dangerous 2.used by the army

Useful expressions It is good / important / convenient for… It can help… It brings people … It is much too… It’s a waste of … It is unnecessary because… I’m the best choice! Come on! I’m No.1!

1.Make a new dialogue to talk about advantages and disavantages of some inventions 2.Preview “Reading”.