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《Writing》公开课PPT课件优质课下载
_______
________
lemon juice, cotton sticks, a piece of paper，two candles.
The characters appear.
Lemon juice reacts with oxygen and produces brown oxide (氧化物).
1Dip your cotton stick into the lemon juice ;
Method
Result
Apparatus
Aim
Conclusion
To find out what happens when lemon juice is heated.
2Write characters with it on the paper;
3Wait a moment until the characters dry.
4Light a candle;
5Heat the paper over the candle after the
lemon juice dries;
Read Passage B again to find out how
to perform magic with nails.
Group 1 Experiment 1
(iron in dry air)
Group 2&3:
Experiment 2
(iron in air-free
water)