Organic chem嘅mass spect同埋acids & bases(AL7)

新課程嘅新加 org chem. 部份仲有use of mass spectra to obtain structural information of common fragments such as R+, RCO+ and C6H5CH2+。同學仔都知mass spectrum e o個 topic不嬲都o向physical chem有o架，以前主要識molecular ion peak，relative abundance ratio同埋mass spectrometer嘅principles就OK。但係而家話明要識 fragementation ，就難左好多o架喇。化學友覺得今年AL都幾大機會會o向org chem嘅structural analysis一齊考(即係估structure呀)，每一年o向PaperII section B都會考一,兩條，而考生一般表現都唔好，所以同學仔唔好睇小e o個topic 呀。其實以前AL chem都有出過同fragmentation 有關嘅題目。雖然e條唔係太深同埋唔係organic compound嘅fragmentation，但係同學仔都值得睇下o架:

2002 Paper II Q.1(b)

如果同學仔平日冇乜做過e d題目，化學友就highly recommend你地去eo個網址睇o下(d questions嘅教統局同中大化學系合作出嘅)，非常有用o架:

http://cd1.emb.hkedcity.net/cd/science/chemistry/s67chem/chem.htm (click 'MS'就得o架喇)

Total有七條題目，Q.1-3 同R+有關; Q.4-5同RCO+有關; Q.6-7同C6H5CH2+有關。

另外係課程仲加咗兩個topics，佢哋係 organic acids and organic bases 同埋redox reactions。如果同學仔小心d對吓，其實佢哋係都係將舊syllabus重組過，有好多pastpaper關於e兩個topics。化學友比幾條好有用嘅pastpaper同學仔丫，做熟佢啦:

1. 1999 Paper II 6a

1. 2000 Paper I 6a

2. 2001 Paper II 6b

3. 2003 Paper I 6a

4. 2004 PaperII 6c

最後化學友d學生成日問iodoform test, silver mirror test, diazonium salt 係唔係 out of syllabus，係道順便同大家講埋，無錯佢哋係已經唔洗識o架啦。

加油呀同學仔!!!!