(精品)Module5__A_Lesson_in_a_Lab.ppt
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1、Module5 A Lesson in a LabIntroduction,reading and vocabularyexist solid liquid metal expand contract mixture substance oxygen surfaceRead through the questions quickly and find out the answers to them.1.How does water exist?2.If you heat a metal,what change will happen?3.What is steel made from?4.Wh
2、at is the earths surface mainly covered by?5.How far is the sun from the earth?6.How old is the earth?7.Which is larger,the earth or the moon?Suggested answers1.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-third
3、s of the earths surface is water.5.The distance of the sun from the earth is 150,500,500 kms.6.The earth is 4.6billion years old.7.The earth is forty-nine times larger thanforty-nine times larger than the moon.Put these words in pairs or groups.air contract earth gas liquid oxygen moon solid sun exp
4、andair-gas-oxygenearth-sun-mooncontract-expandgas-liquid-solidAnswer these questions1.Which of the following are natural?2.Which are man-mademan-made?3.Which can be both?electricity iron metal steel air glassSuggested answers1.electricity,iron,some metals and air 2.steel,some metals and glass3.elect
5、ricity and some metals Put these words in the correct order to describe the stages of a scientific experiment.conclusion aim result methodconclusion aim result methodAim-method-result-conclusionreaction electrical equipment react potassium sodium calcium magnesium aluminium zinc partial copper oxide
6、 rust boil ordinary steam float form dissolve1.A chemical_is a process in which two substances combine together chemically to form another substance.2._means all the special tools,machines,clothes etc that you need for a particular activity.3.When one chemical substance_with another,or when two chem
7、ical substandes_,they combine chemically to form another substance.4.You use_ to refer to something that is not complete or whole.reactionEquipmentreactsreactpartial5.When a metal object_,it becomes covered with rust and often loses its strength.6.Whe a hot liquid_or when you_it,bubbles appear in it
8、 and it starts to change into steam.7._people or things are normal and not special or different in any way.8.Something that_lies on or just below the surface of a liquid when it is put in it and does not sink.9.If a substance_in a liquid or if you_it,it becomes mixed with the liquid and disappears.r
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