(精品)Module5__A_Lesson_in_a_Lab.ppt
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.What 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-thirds 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 expandair-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.electricity 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 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 chemical 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 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.rustsboilsboilOrdinaryfloatsdissolvesdissolve1.Which of the metals in the table reacts the most with oxygen and water?2.What happens when you heat calcium in oxygen?3.Which metals react with steam?4.Does iron have a slow or fast reaction with steam?5.Does copper react with water?Potassium,calcium and sodiumIt burns to form an oxide.Magnesium,Aluminium and zinc.It has a slow reaction.No,it doent.Put the following metals in the right order according to Passage A.1.zinc 2.sodium 3.copper 4.magnesium 5.potassium 6.aluminium 7.calcium5-2-7-4-6-1-3Decide whether these statements are true or false according to Passage A.1.Different metals have different uses.2.The reaction of metals with different substances is the same.3.Magnesium can form an oxide when heated in oxygen.4.Iron reacts with cold water.5.Copper reacts most when heated in oxygen.TFTFFPlease read Passage B quickly to find out the answers to the questions.1.What is there on the surface of the water in the test tube?2.What is the use of the oil?3.What is the use of the cotton wool in the test tube?4.Why are the nails in the test tube with ordinary water rusty?There is oil on the surface of the water in this test tube.The oil can keep air out of water.The cotton wool can keep air dry.Iron reacts with water and forms rust.Fill in the blanks according to Passage B Iron in dry airIron in air-free waterIron in ordinary airStage A(Starting experiment)nailsoil layer nails nailsStage B(1 week later)nailsoil layer water nails nailsStage C(Result)cotton woolcotton woolIron does not rustwaterIron does not rustwaterwaterIron rustsRead Passage B again and complete the sentences.In the first part of the experiment,the_is dry,not wet.It shows that iron_when the air is dry.In the second part of the experiment,you must_the water to make sure there is no_in it.You add_to the water because this keeps_out of it.It shows that_does not rust in water that has no_in it.airdoes not rustboilairsome oilairairnailLanguage pointsexistexistheatheatexpandexpandcontractcontractreactreactburnburnformformthink ofthink ofputin orderputin orderat the top/bottomat the top/bottoma description ofa description offind outfind outmake suremake surekeepout ofkeepout ofaddtoaddtoSentence patterns The earth is twice as large astwice as large as the moon.The earth is forty-nine times larger forty-nine times larger thanthan the moon.It is hard to think of a world without metals.Here is a table.HOMEWORK1.Try to remember the new 1.Try to remember the new words in this text.words in this text.2.Describe a scientific 2.Describe a scientific experiment using what we have experiment using what we have learned in the text.learned in the text.
