a) Grinding a sugar cube into fine powders
b) Candle burning in air
c) passing electricity through a copper wire
d) Wine turning sour
e) Evaporating sea water to fryness
f) Melting an ice cube
以上邊d係chemical/ physical changes?
F.3 Chemistry 問題
2008-11-07 5:50 am
回答 (1)
2008-11-07 6:03 am
✔ 最佳答案
Chemical change involves formation of new substances. In your example, only (b) and (d) are chemical change.For (b), when candle burns, carbon dioxide, carbon monoxide will be given out.
For (d), alcohol is oxidized and carboxylic acid is formed. So there is a sour taste.
For the others, no new substances are formed thus they are physical change only.
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