free metal 一問~

2006-12-28 11:34 pm
想請問most of the free metal we used are obtained from the _______________
(1) rocks (2) air (3) sea

A. (1) only B. (2) only C. (1) and (2) only D (2) and (3) only

答案係咩,點解~???同咩叫free metal???

thanks a lot~ 10 points will be given~

回答 (1)

2006-12-28 11:44 pm
✔ 最佳答案
答案:most of the free metal we used are obtained from the (1) rocks only.

free metal是指一些直接開採而獲取的金屬,例如金、銀。
空氣中當然不能取得free metal;海中的金屬,例如Na和K,它們是從電解海水中取得。
(Na, K不是free metal.)
參考: 中四化學教科書


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