nedddddddd help in balancing equations

[Yellow-Jellow]

hi everybody...i really have a lot of trouple balancing equations in acidic and basic conditions so i need your help in these ...thanx alot !! .. ...

balance the following in acidic conitions

1) Br2(l) + SO2(g) -----> Br-(aq) + SO4 2- (aq)



2) Cu(s) + NO3 - (aq)------> Cu2+ (aq) + NO(g)



3) PbO2(s) + Cl- (aq) -----> PbCl2(s) + Cl2 (g) ( balance Cl in both half-reactions)



4) Cl2(g) --------> ClO3 - (aq) + Cl- (aq) (same reactant in each half-reaction)



Balance the following in basic conditions



5) N2H4(aq) + Cu(OH)2 (S) ------> N2(g) + Cu(s)



6) MnO4 - (aq) + NO2 - (g) -------> MnO2(S) + NO3 - (aq)



7) Cr(OH)3 (s) + H2O2(aq) --------> CrO4 2- (aq) + H2O (aq)



8) Al(s) + NO3 - (aq) --------> Al(OH)4 - (aq) + NH3(aq)



also i like to know what is the half-reaction methode and how can i do it..thanx alot for the help!!

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[ultracet]

Prepharm please

 

[chloejane]

this is also a duplicate post- also in prepharm

 

[bananaface]

Since it's a duplicate post, I'll just close it.

For anyone who wants to help out, here is a link to the thread open in pre-pharmacy.
http://forums.studentdoctor.net/showthread.php?t=181469

- Anna