Qualification > Sciences

Chemistry Help HERE ONLY !!

<< < (74/166) > >>

AN10:

--- Quote from: aquarian93 on May 30, 2009, 04:38:27 am ---u guys
"what property of SO2 enables it be used as a bleaching agent?"
thanks!

--- End quote ---
sulphur dioxide is a good reducing agent. In the presence of water, it is able to decolourize substances.

guru007:

--- Quote from: Q80BOY on May 21, 2009, 06:22:57 pm ---hey guys,

as the chemsitry exam is on the 1st of june, u must all be revising, and u MUST have some questions,

so if u have any CHEMISTRY questions, post them here and hopefully some one will help.

Gd Luck  :)



--- End quote ---

Hey Q80BOY
can u plz explain me extraction of aluminium ???

aquarian93:

--- Quote from: AN10 on May 30, 2009, 05:18:06 am ---
--- Quote from: aquarian93 on May 30, 2009, 04:38:27 am ---u guys
"what property of SO2 enables it be used as a bleaching agent?"
thanks!

--- End quote ---
sulphur dioxide is a good reducing agent. In the presence of water, it is able to decolourize substances.

--- End quote ---
thank you! :)
+REP

guru007:
Can someone help me in extraction of zinc and aluminium ???

thukon:
for zinc, u heat the ore (zinc blende, or zinc sulphide) and it will become zinc oxide and sulphur dioxide. Then u reduce the zinc oxide with carbon monoxide. For aluminium, u have to add sodium hydroxide to the aluminium ore (bauxite) get rid of the iron III oxide impurities. The result is alumina or aluminium oxide. Dissolve this alumina in molten cryolite (to lower the temperature needed for the electrolysis) and then electrolyse it. U get aluminium. The anode is graphite. The cathode is steel i think.

Navigation

[0] Message Index

[#] Next page

[*] Previous page