Group IV(AL8)

講完晒 phy chem同 org chem後，到係時候同同學仔講 inorg chem。Inorg chem係e個syllabus改咗唔少，取消咗nitrogen 同埋sulphur兩個topics。但亦加入GroupIV e個topic。Group IV最特別係同一個group裡面嘅elements有好唔同properties。其實e o個topic都係舊瓶新酒，佢o向兩代前嘅syllabus都有o架啦。

e個topic有3個重點：

1. Interpretation of variation in melting point and boiling point of the elements in terms of structure and bonding (e個group由carbon係non-metal 到 silicon and germanium 係 semi-metals 到最後tin and lead 係metals)

經典pastpaper: 1993 Paper II 4b

2. decomposition of group IV oxides and chlorides (同學仔要知道group IV嘅compounds有兩個possible 嘅oxidation states +4同 +2；+4 嘅oxidation states stability decrease down the group; 而+2 oxidation state 嘅stability increase down the group; 佢嘅原因可以用inert pair effect 去解釋)

經典pastpaper: 1992 paper II 5b同埋1994 paper II 6

3. silicon and silicates，e part係全新內容，冇pastpaper。但係化學友發現教統局製作咗一份reference material可以幫助同學仔溫習，你地可以去e個網址睇吓:

http://cd1.emb.hkedcity.net/cd/science/chemistry/s67chem/chem.htm (click L&T activities然後o向other learning activities就會搵到Silicates 硅酸鹽嘅notes )

重點係留意silicate嘅不同嘅basic units。