有條關於bronze同copper既問題

2009-08-17 1:25 am

Bronze is harder than copper because
A. the atoms in bronze are bonded by strong covalent bonds.
B. the atoms in bronze are packed closer than those in copper
C. the metallic bonds in bronze are stronger those in copper
D. the atoms in bronze are packed more irregular than those in copper
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更新1:

咁點解more irregularly就會令到atoms冇咁容易slip into each other ?

回答 (1)

老爺子

2009-08-17 3:51 am

✔ 最佳答案

The answer is D.

Copper is a pure metal. In copper, all the atoms are identical, and thus the atoms are packed regularly. When a force is exerted, layers of atoms can slip into each other readily. This explains the ductility and malleability of metals.

Bronze is the alloy of copper and tin. When tin atoms of different size are introduced, the metal atoms are packed more irregularly. Therfore, when a force is exerted, layers of atoms slip into each other less readily. This increases the strength of bronze.

2009-08-19 18:23:33 補充：
你想像一下便可以知道。全部同一大小圓球形排在一起，圓球形由一層滑至另一層比較容易。但加入一些大小不同的圓球形，滑動便比較困難了。

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