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cop...cop... kalau untuk rakan-rakan bukan aliran sains...macam mana ye? contohnya untuk subjek geografi dan sains asas?  |
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assalamualaikum n afternoon all~
mekasih dauswq for the invitation |
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korg borak pe nie   |
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Ethanol (ethyl alcohol, grain alcohol) is a clear, colorless liquid with a characteristic, agreeable odor. In dilute aqueous solution, it has a somewhat sweet flavor, but in more concentrated solutions it has a burning taste. Ethanol, CH3CH2OH, is an alcohol, a group of chemical compounds whose molecules contain a hydroxyl group, –OH, bonded to a carbon atom. The word alcohol derives from Arabic al-kuhul, which denotes a fine powder of antimony used as an eye makeup. Alcohol originally referred to any fine powder, but medieval alchemists later applied the term to the refined products of distillation, and this led to the current usage.
Ethanol melts at –114.1°C, boils at 78.5°C, and has a density of 0.789 g/mL at 20°C. Its low freezing point has made it useful as the fluid in thermometers for temperatures below –40°C, the freezing point of mercury, and for other ow-temperature purposes, such as for antifreeze in automobile radiators.
Ethanol has been made since ancient times by the fermentation of sugars. All beverage ethanol and more than half
of industrial ethanol is still made by this process. Simple sugars are the raw material. Zymase, an enzyme from yeast,
changes the simple sugars into ethanol and carbon dioxide
 tacang |
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agak2 biler umah neh nk abes  |
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bkl tutor dh mulakan kerja....slmt berjaya chewan:pompom:
(umpan kredit menjadi) |
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Category: Belia & Informasi
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Author
Post time 20-1-2010 08:23 AM
