Chemistry

👨🏻‍🏫 學術台化學

[匿名]

2007-07-15 2:20 am

我想問一此關於boiling pt 的問題...
1)有嘜野會影響elements的boiling and melting pt？(除咗pressure?)
2)我可以睇嘜野來分辨elements之間邊個的boiling pt 高d？(我知可以從elements的structures 來睇邊個有高d的boiling pt 但如果佢地同樣屬於同一個structure，咁點知呢？)
3)我記得miss講過 atoms的大小會影響boiling pt的高低，但卻唔記得大的會高d ，還是小的會高d...所以可唔可以講給我聽邊個的 boiling pt 會高d ，同explain why...
4) 點樣可以好快咁知道邊個atom大d？(increase across the period? 淨係 across the group?)

拜託哂~
ps 最好用英文答

更新1:

eg. 有兩個同屬一個period的 elements，點解group 3 的boiling pt 會高過 group 1的？

回答 (2)

kenphone6063131

2007-07-15 6:19 am

✔ 最佳答案

2)depend on the intermolecular force(e.g. hv H-bond----->higher b.p.)
size and mass of elements
functional group in the structure(e.g. -COOH, -OH-------hv functional gp which contain polar bond----->higher b.p.)
surface area of the structure(increase surface area--->increase intermolecular force------>increase b.p.)
3)larger mass--->higher boiling pt
becoz larger mass element contain more electrons---->more electrons----->increase electrostatic attraction--->stronger intermolecular force---->higher b.p.
4)down the group---->more electron shells---->outermost electrons held less tightly by nucleus------->so larger in size
across period------>more protons in mucleus------>strong electrostatic force between protons and outermost electrons------->so smaller in size

2007-07-14 22:23:07 補充：
----------&gt其實係------>黎ga唔知點解send出時變左樣

2007-07-14 22:25:31 補充：
group 3 的boiling pt 會高過 group 1coz gp 3 hv metallic bond(e.g. Al)

👍 0 👎 0

Jacky

2007-07-15 3:23 am

pt=plainum=鉑(化學)

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