课件15张PPT。Module 5 A lesson in a lab Aims:
learn the words about science experiment;
Learn the basic steps of doing a scientific experiment.
Learn to write a scientific experiment report.What words can you think of when you look at the picture? science/
scientific experimentApparatus/ equipmentBunsen burnertest tubetube holderconclusion, method, result, aim, apparatusCan you put these words in the correct order?⑤ ③ ④ ① ②Watch & WriteThe reaction between
potassium and water
钾与水的反应.flv Potassium 钾Burn in the _____
React with ______
(Reaction)
Form a kind of ____(碱)
(new substance)waterwateralkali apparatuses, conclusion, reacts, experiment, pour, scientific This is a _________ _________ done in a lab.
First, get all the ____________ ready on the desk, a container(容器) with some cold water in it, some potassium(钾) and a spoon.
Secondly, drop some __________ into the water. Then a strong light will be seen, and it lasts for a while.
We can reach a __________ that potassium _____ with cold water.scientific experimentapparatuspotassiumconclusionreactsTask-cycle Passage AWhat
&
WhyGW: Match names of metals to picturespotassiumsodiumcalciummagnesiumaluminiumzincironcopperFirst-reading 1. Choose the best title for the passage.
2. What should we know when we use metals?
3. Which metal reacts most with water, potassium or iron?It is important to know how they react with
different substances. Potassium reacts most with water.A. The Different Uses of Metals
B. The Reaction of Metals
C. The Reaction of Metals with Oxygen
Interview(3 reporters & scientists) Qs ( more interesting Qs are welcome)
Which metals reacts the most with oxygen and water?
What happens when you heat calcium in oxygen?
Which meals reacts with steam?
Does iron have a slow or fast reaction with steam?
Does copper react with water?
Potassium.It burns to form an oxide.Magnesium,
aluminium,zincSlow.No, it doesn’t.Passage B Task: Write an experiment reportCan we keep iron nails in wet air?rustWatch and write
the condition of iron rusting. flvScanningTrue or false.
Iron rusts easily in dry air.
To make sure there’s no air in the water, you have to boil the water for 3 minutes.
We don’t know whether iron rusts in ordinary water.FTFComplete the sentences using what we learntIn the first part of the experiment, the ____ is dry. It shows that iron ___________ in dry air.
In the second part, you must _____ the water to ______ _______ that there is no air in it. ______ some oil to the water can keep the ______ out of it. It shows that _____ don’t rust in ____________ water.
In the third part, _______ the tube with water. It shows that they rust in _________ water.airdoesn’t rustboilmake sureAddingairnailsair-freehalf-fillordinaryTo find out if...Iron nails, test tubes, oil, tube holders,
cotton wool, Bunsen burner(3) half-fill...with, add, leave...forAfter a week, rust( not ) rust in(1) put...at the bottom of; push...down
leave...for(2) half-fill...with..., boil, put, add...to,
keep...out of, leave...forto find out if potassium reacts with cold water.a container, cold water, a spoon,
potassiumHalf-fill the container with cold water.(2) Pour a spoonful of potassium into
the water.
The potassium burns.Potassium reacts with cold water.DiscussionDo you like doing scientific experiments?
What should you pay attention to when you are carrying out an experiment in a lab?HW: Write a report
