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Post time 8-9-2011 10:29 AM | Show all posts |Read mode
Post Last Edit by lucid_lynx at 8-9-2011 12:02

Salam semua,


selamat hari raya diucapkan.

Nak tanya korang, bagaimana caranya kita org biasa nak leburkan sesuatu logam dan asingkan unsur yg ada didalamnya ? sebagai contoh, aku nak leburkan suasa dan asingkan unsur perak dan emas dari suasa tersebut. boleh ke ? atau kene buat kat lab jugak ?

Betulke ketumpatan sesuatu  unsur tu berlainan ? kalau sekilo emas dengan sekilo perak lain lain ke isipadu dia ? sebab berdasarkan cerita bagaimana archimedes nak tau tukang emas raja tipu ke tak samaada dia campurkan emas tu dengan perak atau tidak so dia letak dalam air.

Aku tak berapa paham lagi sebenarnya konsep tumpat atau tak tumpat nih. ehehehe ~ sila beri pencerahan ye ahli fizik dan matematik sekalian.

terima kasey.   ;) ;) ;)
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Post time 9-9-2011 12:03 AM | Show all posts
Reply 1# lucid_lynx

seingat aku ade kaedah pengasingan tertentu
yg menjadi masalah bile suasa tu dh jadi sebatian complex wlpn hanya bercampur ngan emas/perak

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Post time 10-9-2011 02:24 AM | Show all posts
soalan yg menarik.
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Post time 10-9-2011 02:24 AM | Show all posts
Reply 2# dauswq


memang ade cara ye cik dawus ? mesti agak susah tu kan.
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Post time 10-9-2011 12:00 PM | Show all posts
Reply 4# winamp05

tak dpt elaborate sbb tak de pengetahuan dlm bidang ni...
terutama mengenai kimia
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Post time 10-9-2011 07:11 PM | Show all posts
Reply 1# lucid_lynx


   The elements in ionic compounds can be separated by electrolysis.

Metals above carbon in the reactivity series(potassium, sodium, lithium, calcium, magnesium and aluminium)
are extracted by electrolysis.
Extraction from the metal ore involves reduction of the metal,
and electrons can reduce any metal ion.

metal ions  +  electrons       metal  atoms  (reduction).
non-metal ions  -  electrons        non-metal atoms (oxidation).

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Post time 10-9-2011 07:15 PM | Show all posts
Kaedah metallugy lebih tepat rasa nya

Main processSub-process
1. Concentration of the ore     (removal of unwanted      metals and gangue to      purify the ore).a. Hydraulic washing.  
b. Gravity separation.  
c. Froth floatation.  
d. Magnetic separation.  
e. Chemical separation.
2. Conversion into metal     oxide. a. Calcination for carbonate ore.  
b. Roasting for sulphide ore.
3. Reduction of metal oxide to     metal.a. Roasting - mercury (Hg) is produced by roasting     Cinnabar (HgS) in air.  
b. Reduction - using highly reactive         elements. Example: aluminium reduces manganese     dioxide to manganese.  
c.  Electrolytic reduction - highly reactive elements,     such as sodium and mercury, are obtained by     electrolytic reduction when the metal is deposited     at cathode.
4. Refining of impure metal     into pure metals.[size=-1]a. Electrolytic refining - of copper, gold, tin, lead,     chromium, nickel, etc.
[size=-1]b. Liquation process - for tin, lead and bismuth.
[size=-1]c. Distillation process - for zinc, mercury.
[size=-1]d. Oxidation process - for iron.
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Post time 19-12-2011 02:14 PM | Show all posts
gune kaedah cupellation untuk asing Au and Silver dr other impurities
~gune temperature yg tinggi
Boleh google kalau nk tau kaedahnye camne...

Or gune electrowinning method kalau Au and Silver tuh lam bentuk ion..
~~Boleh google sndiri gak kalau nk tau kaedahnye camne

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Post time 13-1-2012 01:57 AM | Show all posts
boleh lah asingkan emas kat cpu... hehehe cerucuk yang kat cpu tu emas ka?
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Post time 13-1-2012 02:08 AM | Show all posts
boleh lah asingkan emas kat cpu... hehehe cerucuk yang kat cpu tu emas ka?
Nape?Tak caye? Post at 13-1-2012 01:57



   kalau emas kompom ramai dh kaye skrg ni..
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Post time 13-1-2012 02:14 AM | Show all posts
kalau emas kompom ramai dh kaye skrg ni..
midory Post at 13-1-2012 02:08



    serius ...bukan emas ka? aku mati mati ingatkan emas
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Post time 13-1-2012 02:37 AM | Show all posts
serius ...bukan emas ka? aku mati mati ingatkan emas
Nape?Tak caye? Post at 13-1-2012 02:14



  bukan la.. kalau tak silap aku tu copper..
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