1、Read the passage as 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 AWe can reach a conclusion that it isimportant for us to read books.It is our aim to build up a harmonious society.It is a piece of e
2、lectrical equipment.The stone contains potassium.sodiumcalcium magnesium The wheel is made of aluminum.zinc oxideNails are easy to rust in the damp air.Water boils at 100 C.Read the passage again and answer the following questions:1.Which of the metals in the table reacts the most with oxygen and wa
3、ter?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?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 passa
4、ge and fill in the chart.Passage BIron in dry airIron in air-free waterIron in ordinary waterStage A(starting experiment)cotton woolwater water Stage B(1 week later)Stage C(Result)nailswater Iron does not rustIron does not rust Iron rusts1.In the first part of the experiment,the _ is dry,not wet.2.I
5、t 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.airdoes not rustboilairRead the passage again and complete the sentences.4.You add _ to the water because this keeps _ out of it.5.It shows that _ does not rust in wat
6、er that has no _ in it.some oilairnail airComplete 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 uses,for example,iron can be used in _ equipment.But above all we should know whether it will _ underelectricalr
7、eactdifferent 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 _.oxideOn the other hand,if it is put together with water or _,there will be a _ reaction.Next lets do an _ to support the above.First,
8、get a test tube filled with water and put it over the _ to _ for three minutes.steampartialexperimentBunsen burnerboilThen put three or four clean nails in the water with some oil added to it and leave the tube for one week.What happens?The iron does not _ in air-free water.Another experiment,if you
9、 put the nails in the tube with the air in it for one week,then what happens?Iron rusts in _ water.rustordinaryRead about an incident during a chemistry lesson and choose the best summary.Reading on P931.A student didnt follow the instructions carefully.He took the wrong liquid from the cupboard and
10、 nearly poisoned the class.2.2.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 student was doing a chemistry experiment when he accidentally heated the wrong liquid and caused an incident in
11、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.How can they make the reaction quicker?By making the mixture hotter.4.What mistakes did Paul make?He used the wrong liq
12、uid.5.Why did he make the mistake?Because there was no label on the bottle.6.What happened when Paul heated the liquid?It formed a thick cloud of white gas.7.Why did the teacher send the students out of the room?Because the liquid was acrylamideand the gas was poisonous.8.What lesson did the incident teach the students and the teacher?Never to leave a bottle without a label in the chemistry lab.1.Learn the new words by heart.2.Read Passage A and B and try to retell it.Homework
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