HKCEE 1996 問題

恩樂

2007-02-28 12:31 am

利用以下儀器和材料 , 簡單描述一實驗以證明空氣是鐵生"金秀"的必要條件

"試管兩枝 , 試管夾 , 本生燈 , 兩枚乾淨的鐵釘 , 石蠟油和自來水"

回答 (1)

bzoodie

2007-02-28 12:48 am

✔ 最佳答案

1. Pour approximately equal amount of water to both test tubes.
2. Use a Busen Burner to boil the water of a test tube, not two.
3. Put a nail in the test tube after the water is boiled.
4. Then pour a little amount of oil on top of the water.
5. Put another nail in the test tube and repeat the step 4.
6. Leave the test tubes on tube stand for a week maybe.
7. Observe the result.

The predict result is: Nail in boiled water will not be rusted.
Reason: Most air, such as oxygen will be exiled after boil

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