2007年4月6日 星期五

會考化學(2)

為在令同學仔容易分類,所以化學友以後都會用藍色寫會考嘅文章而AL就用綠色寫。仲有AL會少d中文terms,因為大部份同學仔AL都係用english。

上次講開課程嘅核心同埋延展部份,一般嘅教科書都有標記識別延展部份。如果同學唔知道或者唔肯定嘅話,可以到以下網址睇下:
http://www.emb.gov.hk/index.aspx?nodeID=2824&langno=2
(有underline嘅地方就係延展部份)

以下果d就係仲未出嘅延展部份內容,參考吓啦!

The Microscopic World(微觀世界):

predicting structures and properties of substances(推測物質的結構和特點)

The metals (金屬) :
corrosion resistance of aluminium (鋁的腐蝕)
anodization as a method to enhance corrosion resistance of aluminium (增強鋁的抗腐蝕性的陽極氧化作用)
deciding appropriate methods to prevent metal corrosion base on social, economic and technological considerations (從社會、經濟及技術考慮上選擇防止金屬腐蝕的方法)

Acids and Alkalis (酸和鹼):
strength of acids and alkalis(酸和鹼的強度)

Chemical Cells and Electrolysis (化學電池和電解):
Nitric acid of different concentrations as oxidizing agent to give NO and NO2 (以不同濃度的硝酸作氧化劑生成NO和NO2)
Reactions in chemical cells consisting of half cell(s) other than metal-metal ions systems(以金屬-金屬離子以外的半反應系統作化學電池的反應)

Products from Important Processes (重要工業過程的產品):
location of chemical plants in relation to the availability of resources, transport and environmental impact (以資源的供應、運輸設備及對環境影響為化學工廠選址)

Plastics and detergent (塑膠與清潔劑):
production of soaps; Compare soaps and soapless detergents (肥皂的製成; 肥皂與清潔劑的比較)

之後嘅文章再為同學仔深入了解各部份的內容。

2 則留言:

Sinying 提到...

我有一個問CE的問題,希望化學友你可以答答我.
我想問:
寫IODINE SOLUTION時, I2係應該(aq) 定(s)?
仲有有時寫obeservation :iodide ion is reduced to iodine,應該寫solution turns to brown,定係 brown precipitate forms?兩個係唔係有大分別???
唔該哂!!!!!!

化學友 提到...

sinying, iodine在室溫之下是solid state, 但係iodine會少少溶o向水裡。所以iodine solution應寫成I2(aq)。
同一原理,當在一solution裡的iodide ion is reduced to iodine,形成的iodine原本是solid的,但iodine溶於solution的水裡面形成啡色的I2(aq)。所以,答案係soution turns to brown。除非很多I2形成,多到不能溶於水,咁樣就有brown precipitate forms。不過通常CE答案寫solution turns brown就已足夠啦。saying解答到你問題嗎?