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外研2003课标版《Writing》精品PPT课件优质课下载
some clean iron nails,___（2）___,test tubes holder,
cotton wool,oil,Bunsen burner
Method
First, put some iron nails __ （3） ___ ___ test tubes.
Second,__（4）___ some cotten wool __（4）__ the tube.
Third, leave the tube for one week.
First, half-fill a test tube with water.
Second, boil the water for 3 minutes
Third,___（5）_ some nails __（5）__the water
Forth, __（6）__ some oil ___（6）_ the water.
Fifth, leave the tube for one week.
First, __（7）__ the test tube __（7）__water and add some nails.
Second, _（8）the tube __（8）__ one week.
Result
the nails rust
the nails don't rust
the nails rusts
Conclusion
iron rusts in ordinary water
We _____ ___an experiment today to___ ____ if iron rusts in dry air , in water that has no air in it or in ordinary water.
The following apparatus were used: 3clean iron nails,_________,test tubes holder,cotton wool,oil and Bunsen burner.
The experiment is _______into 3 steps, the first step is done as follows:
First,we _________a test tube _____ water.Second,boil the water for 3minutes. After that,put some iron nails in the water.And then, _____ some oil ____ the water.Finally,____ the tubes ____ one week.
The______of the experiment is that the nail
doesn’t rust in air-free water.