simple balanced equations

hi,

I would like the answers to these questions please. I've been given a ***
to do for practise, and since I've no idea what the REAL answers are, I
can't check my understanding/working out, so it's a bit useless without the
answers as I won't know where I've gone wrong.

So please could you balance these equations by assigning oxidation no's and
writing half equations for the oxidation and reduction process? Thanks.

1. (S2O3)2- + I2 ---> (S4O6)2- + (I)-

2. Br2 + (S2O3)2- + H20 ---> (SO4)2- + (Br)- + (H)+

3. (Fe)3+ + (I)- ---> (Fe)2+ + I2


4. (IO3)- + (I)- + (H)+ -----> I2 + H2O

5. (CrO4)2- + (H)+ ---> Cr2O7(2-) + H2O

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Thanks. This isn't homework -- the only person I'd be cheating is myself if
I couldn't do it.


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