Qualification > Sciences
Chemistry P3 7/6/2010
Dana:
--- Quote from: ~VIN1094~ on June 06, 2010, 09:03:39 pm ---Um, does this help?:: https://studentforums.biz/index.php/topic,1411.msg254665.html#msg254665
--- End quote ---
yes it does thank you! so the "negative pole" is actually the anode and vice versa?
Vin:
--- Quote from: Dana on June 06, 2010, 09:06:12 pm ---yes it does thank you! so the "negative pole" is actually the anode and vice versa?
--- End quote ---
See, in a cell there is nothing called anode or cathode. Like I mentioned, just -ve and +ve poles. If you see you regular AA/AAA batteries have + and -, it is the same here.
An anode forms when an electrode is given the +ve charge, and -ve charge for cathode.
Here The +ve and -ve charges are produced.
Always in a cell the more reactive metal is the -ve terminal as it is the source of e-.
Dana:
--- Quote from: ~VIN1094~ on June 06, 2010, 09:15:38 pm ---See, in a cell there is nothing called anode or cathode. Like I mentioned, just -ve and +ve poles. If you see you regular AA/AAA batteries have + and -, it is the same here.
An anode forms when an electrode is given the +ve charge, and -ve charge for cathode.
Here The +ve and -ve charges are produced.
Always in a cell the more reactive metal is the -ve terminal as it is the source of e-.
--- End quote ---
thank you but see here qs 5 b http://www.freeexampapers.us/IGCSE/Chemistry/CIE/2007%20Jun/0620_s07_qp_3.pdf[url]]http://www.freeexampapers.us/IGCSE/Chemistry/CIE/2007%20Jun/0620_s07_qp_3.pdfhttp://
it specifically says anode and cathode :/ is it a cell or electrolysis?
Vin:
--- Quote from: Dana on June 06, 2010, 09:19:50 pm ---thank you but see here qs 5 b http://www.freeexampapers.us/IGCSE/Chemistry/CIE/2007%20Jun/0620_s07_qp_3.pdf[url=http://]]]http://www.freeexampapers.us/IGCSE/Chemistry/CIE/2007%20Jun/0620_s07_qp_3.pdfhttp://
it specifically says anode and cathode :/ is it a cell or electrolysis?
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Um, electrolysis is 5 b)i ans ii. This is something CIE wants to confuse people, you might have never learned about it but you should use your concepts of oxidation and reduction. Something to be oxidised needs to loose electrons, (rusting is a type of oxidation), if you see there is a power supply which provides constant supply of e- which doesn't allow it to rust.
SoONa:
--- Quote from: contraentry on June 06, 2010, 08:37:24 pm ---Metal Nitrate:
(upon heating)
Group 1: Metal Nitrate > Metal Nitrite + Oxygen
Group 2 & Others : Metal Nitrate > Metal Oxide + Nitrogen Dioxide + Oxygen
Metal Hydroxide :
(upon heating)
Group 1 : No Decomposition
Group2 & Others : Metal Hydroxide > Metal Oxide + Water
Metal Carbonate:
(upon heating)
Group 1: No Decomposition
Group 2 & Others : Metal Carbonate > Metal Oxide + CarbonDioxide
--- End quote ---
thank u soo much very helpful.. !!!
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