Qualification > Sciences
CHEM AND BIO HELP AND TIPS HERE
Vin:
--- Quote from: 7ooD on June 05, 2010, 05:56:28 pm ---i have this doubt in november 2007 5 iii can a strong base replace a weaker one from itz salt solution and another doubt in 2009 may 8 iii in the mark scheme it said NOT SODIUM ,LEAD OR ANY THING BELOW MAGNESIUM how come i dnt get it
--- End quote ---
Sorry, I didn't get your first question. The question (b) is not about it, right? Can you give an example? :-[
About the second. The reason behind choosing any metal below Mg is that Sodium and Lead (also metals abv. Mg) don't react with alkenes. The acrylic acid contains a double bond (is unsaturated).
Baladya:
VIIIIN U got Member of the month ;D
omg i was sure u would get it :D
and yes, Nid deserves it :D
Vin:
Such a big thing! Yes she deserves it totally..*ahem a typo :P*
Thanks Baladya.. ;D
Ivo:
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?
7ooD:
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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