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本帖最後由 hosum2007 於 28-10-2010 19:32 編輯
印象中graphite係因為佢係giant covalent strutrue 先可以conduct electricity...
but metal conduct electricity既能力係higher than graphite.....
because giant metallic struture 入面都係有正離子去引導D負離子...
好似係咁... 我都係今年學... 本書擺左係school so 比唔到個標準答案你...
而家個本係教metals....教緊個課係講reactivity of metals....
至於點解搵copper 去做電線because the tensile strength of copper is higher than sliver and gold and copper is cheaper than sliver and gold...
p.s.此人正在練習以english 去答題.. so 見到一時英文一時中文唔好插我...
because有D eng 唔係幾熟... |
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發表於 28-10-2010 19:29:48