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  1. 1. By using HCFC 2.Because the HCFC will destroy the ozne layer through the photo-induced scission to produce the chorine radical, which catalyzed the conversion of ozone to oxygen. 3. It cannot block the ultraviolet radiation, so it will harm the people. 4...

    分類:科學及數學 > 化學 2010年03月02日

  2. Polystyrene IPA: /ˌpɒliˈstaɪriːn/ is an aromatic polymer made from the aromatic monomer styrene, a liquid hydrocarbon that is commercially manufactured from petroleum by the chemical industry. Polystyrene is a thermoplastic substance, normally...

    分類:科學及數學 > 化學 2008年02月29日

  3. Expanded polystyrene foam (EPF) is a plastic material that has special properties due to its...filter out over- and undersized beads. After that, the beads of polystyrene must be expanded to achieve the proper density. This process is known as pre-expansion, and involves ...

    分類:科學及數學 > 化學 2010年02月20日

  4. expanded polystyrene polystyrene foam expanded polystyrene foam 都係指緊「發泡聚苯乙烯」 即係俗稱「發泡膠」

    分類:科學及數學 > 化學 2008年02月21日

  5. Key: temp = temperature and atm = atmospheric pressure polystyrene and expanded polystyrene use the same reagent to form that is phenylethene. For expanded ...

    分類:科學及數學 > 化學 2007年03月03日

  6. ...電子,第三層可填入 8 粒電子。可填入電子的數目 = 2 + 8 + 8 = 18。 ===== 10e- expand octet 這句意思也不清楚,我想原意是「第三週期原子除了可填入 18 粒電子...

    分類:科學及數學 > 化學 2008年11月25日

  7. No country prohibits usage of expanded polystyrene A bill to ban the use of expanded polystyrene has...

    分類:科學及數學 > 化學 2007年03月03日

  8. Conventional polymerization of styrene does not make the polymer to expand . During production of expanded polymer, expanding gases...

    分類:科學及數學 > 化學 2008年02月21日

  9. ...ozone layer,what are the other problems of using large amount of expanded polystrene? (1) Plastic waste in the sea poses direct danger to marine...

    分類:科學及數學 > 化學 2007年02月22日

  10. ...inside will begin to move in a large wave and high speed. therefore,the things will expand due to the praticles' movement. when they were cooled...

    分類:科學及數學 > 化學 2007年01月21日