本區搜索:
Yahoo!字典
打印

[Chem] Petroleum fraction properties

[隱藏]

Petroleum fraction properties

Why petroleum fractions of lower relative molecular masses
(1) are lighter in color
(2) are more flammable
than those of greater relative molecular masses?

[ 本帖最後由 Light2012 於 2015-12-21 11:22 PM 編輯 ]
   
2016 Diploma of Secondary Education Examination
中國語文 / English Language / Mathematics (Core + M2) / 通識教育
Biology / Chemistry / Physics

TOP

Low molecular mass fraction should be more flammable

TOP

回覆 2# harrypeter 的帖子

Corrected. But do you know how to explain?
2016 Diploma of Secondary Education Examination
中國語文 / English Language / Mathematics (Core + M2) / 通識教育
Biology / Chemistry / Physics

TOP

Is that fractions with lower number of carbon atoms can undergo complete combustion more readily? Thus, the flammability decreases with the increasing number of carbon atoms. Also, Petroleum fractions with lower molecular masses are lighter in colour because the sootiness is relatively lower, right?

TOP

Burning FUELS

Actually, we burn vapour rather than burn liquid.
If a fuel has lower b.p., that means it forms vapour easily.

For colour intensity, large molecules pack closer and light can be absorbed a little bit. ( remember only vacuum has 100% transmittance of light.)
找我補番兩個鐘,放榜不用面燶燶。
68887701 / 97008603 WHATSAPP

TOP

重要聲明:小卒資訊論壇 是一個公開的學術交流及分享平台。 論壇內所有檔案及內容 都只可作學術交流之用,絕不能用商業用途。 所有會員均須對自己所發表的言論而引起的法律責任負責(包括上傳檔案或連結), 本壇並不擔保該等資料之準確性及可靠性,且概不會就因有關資料之任何不確或遺漏而引致之任何損失或 損害承擔任何責任(不論是否與侵權行為、訂立契約或其他方面有關 ) 。