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1、 Introduction and writing tongs crucibledissolvesolid/liquid/gasbalanceBunsen burnertest tubetest tube1. (a) Water exists as a solid, a liquid and a gas. (b) Water exists as a solid and a liquid only.2. (a) When you heat a metal, it expands. (b) When you heat a metal, it contracts.Guess, listen and
2、check the answer. Listening 3. (a) Steel is a mixture of iron and other substances. (b) Steel is a mixture of iron and oxygen.4. (a) Two-thirds of the earths surface is water. (b) 50% of the earths surface is water.5. (a) The distance of the sun from the earth is 25,5000 kilometres. (b) The distance
3、 of the sun from the earth is 150,500,500 kilometers.6. (a) The earth is 4.6 million years old. (b) The earth is 4.6 billion years old.7. (a) The earth is twice as large as the moon. (b) The earth is forty-nine times larger than the moon.PUT THESE WORDS IN PAIRS OR GROUPS.air contract earth gas liqu
4、id oxygen moon solid sun expand 1) air gas oxygen 2) contract expand 3) earth sun moon 4) gas liquid solid 1.liquid : 液体液体2.expand: vi. 使使.膨胀膨胀 Metals expand when they are heated. 3. contract vi. 收缩收缩Metals contract as they get cooler. 4. substance n. 物质物质 5. mixture n. 混合物混合物6. oxygen 氧气氧气7. electr
5、icity n.电电ANSWER THE QUESTIONS.1.Which of the above are natural? Electricity, iron, some metals and air are natural. 2. Which are man-made? Steel, some metals and glass are man-made. electricity iron metal steel air glass 3. Which can be both? Electricity and some metals (alloys for example) can be
6、man-made and occur naturally.LISTENING LISTENING TEXTTEXT 1. Water exists as a solid, a liquid and a gas.2. When you heat a metal, it expands.3. Steel is a mixture of iron and other substances.4. Two-thirds of the earths surface is water.5. The distance of the sun from the earth is 150,500,500 kms.6
7、. The earth is 4.6 billion years old.7. The earth is forty-nine times larger than the moon.Listening and writing Listening and writing You will hear a conversation in which a teacher helps a student do an experiment. Read the Aim below and predict the Result.Aim: To find out if there is a change in
8、weight when the metal magnesium burns in air.Result:_.Aim: _ _ _To find out if theres a change in weight when magnesium burns in air. Listen and complete the description of the scientific experiment.Apparatus: _ _Method: _ _ _ _ _ _ _Magnesium, Bunsen burner, a balance, a crucible. First, put the ma
9、gnesium in the crucible. Then put the crucible on the balance and weigh it. Next, heat the magnesium. Light the Bunsen burner and hole the crucible over it. Finally weigh the magnesium again. Result: _Conclusion: _ _ _It weighs a little more than before.There is a change in weight when magnesium bur
10、ns in air.Listening text(Mr C=Mr Chen, Z.K=Zhou Kai, L.K= Li Kang)Mr C: OK, boys and girls, were going to do an experiment. Come a bit closer. The closer you are, the more youll see! Thats right! Now, whats the aim of this experiment, Zhou Kai?Z.K: We want to find out if theres a change in weight wh
11、en magnesium burns in air.Mr C: Thats right. So what do we need first?Z.K: Um We need some magnesium. How much do we need? What about this piece? Is this piece OK?Mr C: No, we need rather more than thatabout two and a half grams. We need a piece which is much bigger than that. Z.K: OK And we need a
12、Bunsen burner a balance and a crucible to put the metal in Here they all are. Where do we go from here?Mr C: Well, first, put the magnesium in the crucible. Then put the crucible on the balance and weigh it. Z.K: OKMr C: How much does it weigh? Take a look, everyone. Is it any heavier?Z.K: Um It wei
13、ghs two and a half grams. Do you want me to write that down?Mr C: Yes, write it down. What next?Z.K: Yes Um, next, were going to heat the magnesium. So I light the Bunsen burner. After that, I hold the crucible over it Oh look, its burning with a white light! Its getting brighter and brighter!Mr C:
14、Its pretty, isnt it? Keep the noise down, boys and girls, please.Z.K: Um lastly, we need to weigh the magnesium again It weighs four grams now. Mr C: So what does that tell you?Z.K: It weighs a little more than before.Mr C: How much more?Z.K: 1.5 grams more.Mr C: And what does that mean?Z.K: It mean
15、s that there is a change in weight when magnesium burns in air.Mr C: Youve got it! Well done! So now, lets do the same experiment with copper. Come along. Li Kang, its your turn now. What do you think will happen if you heat copper?Z.K: I think itll be a lot heavier than magnesium. Shall I begin?Mr
16、C: Yes, go ahead!1. “Where do we go from here?” means _. A. What shall we do next? B. Is this the right way?2. “Keep the noise down” means_. A. Dont talk B. Talk quietly Choose the correct meaning. 3. “Youve got it” means _. A. Youve understood B. You have something 4. “Go ahead!” means _! A. Go awa
17、y B. Begin 5. “Its your turn” means _. A. Youre next B. Turn round Decide what the aim of the experiment is. Listening and speaking on Page 95The aim is to write a secret message.Put the stages in the correct order.1. 2. 3. 4. b squeeze lemon and pour the juice into a containerf dip your pen into th
18、e juicea write your message on a piece of paperg blow on the paper to dry the lemon juice 5. e light a candle6. c heat the paper in the candle flame7. d the message appears when the juice reacts with oxygen and produces brown oxideListening text The aim of this experiment is to write a secret messag
19、e with invisible ink. For the experiment, you need the following things: a lemon, a small container, a pen, some white writing paper, a candle and some matches. First, squeeze the lemon and pour the juice into a container. A glass or a cup will be fine.Next, take your pen and dip it into the lemon j
20、uice then write your message in large letters on a clean sheet of white writing paper. After that, blow on the paper to dry the lemon juice. Your secret message is ready and you can exchange messages with another student. Next, light a candle with the matches. Finally, hold the paper near the candle flame. The message will gradually appear on the paper. The words are a light brown color. The message appears on the paper when you heat it because the lemon juice reacts with oxygen in the air. This reaction produces a brown colored oxide which you can see. Homework Preview Vocabulary on Page 46.
