palladium is also accepted broplatinum, NOT palladium.....just yesturday i saw this written in a mark scheme
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palladium is also accepted broplatinum, NOT palladium.....just yesturday i saw this written in a mark scheme
i am re-posting this question:
Assalamwa'laikum Warahmatullahi Wa Baraqaatuhu...
I AM GIVING CHEM P21 THIS COMING 21st
I am giving AS levels...
i have question it does not involve past paper though....
1. Construct ionic half equation for:
a) PbO2(s) being reduced to PbSO4(s) in presence of of H2SO4(aq)
b) PbSO4(s) being reduced to Pb(s) in the presence of water.
c) Mow write the balanced equation for the reaction between PbO2 and lead in the presence of dilute sulfuric acid.
please someone EXPLAIN me the steps involved in getting the answer right...
THANK YOU!
- do have to know the trends of the periodic table?
- what do we actually study for chem p5?
- if i solve pp is it enough??
I'm getting:i am re-posting this question:
a) PbO2(s) being reduced to PbSO4(s) in presence of of H2SO4(aq)
I'm getting:
PbO2 + 4H^(+) + SO4^(2-) + 2e- ------> PbSO4 + 2H2O
This is a perfectly balanced half equation.
But the problem with this equation is that it doesn't make sense. Sulfuric acid is a dibasic acid. This means one mole of H2SO4 will give 2 moles of H+ and one moles of sulfate ions. But here, we have 4 moles of H+ and one moles of sulfate ions. Is such a reaction possible? I don't know.
dude chill, okay? and if you wanna discuss chem p4, do it here.WHERE THE IS CHEM PAPER 4 THREAD ????? PAPER 4 CARRIES 38 % WEIGHTING MORE THAN ANY OTHER COMPONENT IN CHEMISTRY AND ALL PPL CARE ABOUT IS PAPER 5 AND PAPER 2. PAPER 5 CARRIES ONLY 23% WEIGHTING. IF ANY OF U KNOW WHETHER THERE IS ANY CHEM P4 THREAD PLEASE REPLY .
tnx
Oxygen? I don't think we're allowed to add oxygen. :SHere: Take half equation from this
2 PbO2 + 2 H2SO4 = 2 H2O + O2 + 2PbSO4
Im not adding it.. thats what happensOxygen? I don't think we're allowed to add oxygen. :S
Check the guidelines in the syllabus too and check this:
http://www.xtremepapers.com/community/threads/chemo-p5-tips.5917/
u need to know only how to perform its calculations.....there are a handful of questions related to its calculations in p1 and p2,esp p1Do we need to know the working of mass spectrometer?
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