Qualification > Sciences
CHEM AND BIO HELP AND TIPS HERE
NidZ- Hero:
can any 1 exactli show hw u do we this question
Draw a diagram to show the arrangement of the valency electrons in one molecule
of the covalent compound hydrogen sulphide.
Use o to represent an electron from a sulphur atom.
Use x to represent an electron from a hydrogen atom
:-\
Baladya:
--- Quote from: Ivo on June 05, 2010, 07:19:07 pm ---This is a probably a really dumb doubt but I'd appreciate if someone could please kindly answer it.
I'd just like to know in an electrochemical cell, when the more reactive metal loses the electrons and becomes a positive ion, I just wonder why here it becomes the negative cathode. And the less reactive metal gains the electrons becomes the positive anode?
--- End quote ---
I think this has to do with electricity: From negative to postitive....
not sure tho
Vin:
--- Quote from: Ivo on June 05, 2010, 07:19:07 pm ---This is a probably a really dumb doubt but I'd appreciate if someone could please kindly answer it.
I'd just like to know in an electrochemical cell, when the more reactive metal loses the electrons and becomes a positive ion, I just wonder why here it becomes the negative cathode. And the less reactive metal gains the electrons becomes the positive anode?
--- End quote ---
Well, as the more reactive metal gives e-, it is a source of -ve charge hence it is called the negative pole.. You see it isn't really the "cathode", its just
the -ve terminal of the battery.. same goes for the +ve terminal and not "anode".
The diag. unnecessary I guess...
Ivo:
--- Quote from: ~VIN1094~ on June 05, 2010, 07:36:27 pm ---
Well, as the more reactive metal gives e-, it is a source of -ve charge hence it is called the negative pole.. You see it isn't really the "cathode", its just
the -ve terminal of the battery.. same goes for the +ve terminal and not "anode".
The diag. unnecessary I guess...
--- End quote ---
Nah, good diagram and explanation! Thanks!!! ;D Just another thing, so electrons flow from the negative pole to the positive pole through the external circuit in wires, whereas ions move through the electrolyte?
Vin:
--- Quote from: 7ooD on June 05, 2010, 07:28:52 pm ---thx vin so anything above mg doesnt react wiz double bonds like alkenes but can u explain reason for that plz and for other question i meant q 5 c iii nov 07 just one more last thing can anyone upload a guide for finding limiting reagent from equation :D
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I am really sorry, I don't really know the 'accurate' info. about it, also I don't think we have to know about it. So if a question like this turns up, stick to the other options like carbonates, oxides etc.
Ah, yes a strong base can effectively displace the weak salt. Simpler eg. 2NaOH + CuSO4 ---> Na2SO4 + Cu(OH)2
My apologies again 7ooD I don;t have any guide based on limiting reagent :-[ :'(
Also google "how to find limiting reagent", you'll get many links..
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