Chemistry P3 7/6/2010

[Dana]

Um, does this help?:: https://studentforums.biz/index.php/topic,1411.msg254665.html#msg254665

yes it does thank you! so the "negative pole" is actually the anode and vice versa?

[Vin]

yes it does thank you! so the "negative pole" is actually the anode and vice versa?

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]

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-.

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]

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?

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]

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  

thank u soo much very helpful.. !!!

[luv3life]

Leaving for Chemistry Paper 3 now. Very nervous! My paper starts after 1 and a half hours...

Wish me Luck, guys!

Pray for me, and I shall pray for you!

[gaurav95]

going for d xam in an hour.....

[Dana]

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.

thanks

[The Golden Girl =D]

yo amigos ...........i hope y'all roast the paper today ,if u kno what i mean

[J.Darren]

yo amigos ...........i hope y'all roast the paper today ,if u kno what i mean

You evil meanie -v- Jokes ... Well I had my exam earlier this afternoon, a high A* is guaranteed, sadly no chance of Top in the World nor Brilliance in Hong Kong due to two careless mistakes that I would never concede in unit tests and internal mocks D:

[The Golden Girl =D]

You evil meanie -v- Jokes ... Well I had my exam earlier this afternoon, a high A* is guaranteed, sadly no chance of Top in the World nor Brilliance in Hong Kong due to two careless mistakes that I would never concede in unit tests and internal mocks D:

lol.....well atleast an A* is guaranteed mate

[J.Darren]

lol.....well atleast an A* is guaranteed mate

This can be best described as a stinging bitterness, checked thrice with the lab dude and chemistry teacher at school, am very confident that I have gotten every single questions in papers 1 and 5 correctly ... I probably have lost three marks at max in Paper 3, but since my ultimate aspiration is Top in the World, it is a major setback nonetheless ...

[elemis]

This can be best described as a stinging bitterness, checked thrice with the lab dude and chemistry teacher at school, am very confident that I have gotten every single questions in papers 1 and 5 correctly ... I probably have lost three marks at max in Paper 3, but since my ultimate aspiration is Top in the World, it is a major setback nonetheless ...

The past is quite simply; the past. No matter how hard you try the clock cannot be turned backed.

Relish your A* and be ready to put a wide smile on your parent's face.

[Helium]

yo amigos ...........i hope y'all roast the paper today ,if u kno what i mean

yup we roasted, heated and burned in air,

and obtained it pure.

[J.Darren]

yup we roasted, heated and burned in air,

and obtained it pure.

You have forgotten to wash it with water prior to roasting in order to remove traces of the solution in percipitation