Qualification > Sciences
CHEM AND BIO HELP AND TIPS HERE
The Golden Girl =D:
guys whenever a question comes and any oxide "batani7!!" ....i don't anythin hat's related to oxides ..... and stuff ...the only thing i kno abt oxides is that the non-mtealic r acidic and the metallic r basic ..and there r some amphotaric ....... can someone plz explain to me ..
ummm ohh and another thing ....there is this weird question that i'd like u to look at, it's jun 2000 paper 1 chem ig question 26) ..
http://www.freeexampapers.us/IGCSE/Chemistry/CIE/1993-2003/ChemistryExamP1.pdf
thx in advance
The Golden Girl =D:
when the questions says smthn is below ph 7 , does that mean it's acidic or basic?
thx in advacne :D
Ghost Of Highbury:
below pH 7 - acidic. u must be clear with these basic concepts by now, acids and bases is a very common topic. :)
By the way, @hesham - heres the working wid acid electrolyte.
the hydrogen (H2) loses electrons.. 2H2 --> 4H+ + 4e- which travel through the circuit to the cathode and react with O2..also the H+ ions from the acid electrolyte meets the electrons and O2 at the cathode
the reaction
O2 + 4H+ + 4e- = 2H2O
---
The H+ ions removed from the electrolyte are replaced by those produced at the anode.
nid404:
thanks adi +rep
holtadit:
--- Quote from: the golden girl on May 07, 2010, 03:35:19 pm ---guys whenever a question comes and any oxide "batani7!!" ....i don't anythin hat's related to oxides ..... and stuff ...the only thing i kno abt oxides is that the non-mtealic r acidic and the metallic r basic ..and there r some amphotaric ....... can someone plz explain to me ..
ummm ohh and another thing ....there is this weird question that i'd like u to look at, it's jun 2000 paper 1 chem ig question 26) ..
http://www.freeexampapers.us/IGCSE/Chemistry/CIE/1993-2003/ChemistryExamP1.pdf
thx in advance
--- End quote ---
Okay the answer is 26 B. Heres the explanation coming up....
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