[sci4life]

How do you do these?  Need help... I don't know how to do it.

Complete and balance the following half-reactions. In each case indicate whether oxidation or reduction occurs. (Use the lowest possible coefficients. These may be zero.)

Mn²⁺(aq) --> MnO₂(s) (basic solution)
ClO^3-(aq) ---> Cl  (acidic solution)
La(s) ---> La(OH)₃(aq) (basic solution)

Balance the following equations. (Use the lowest possible coefficients. These may be zero.)

(c) H2O2(aq) + Cl2O7(aq) --->  ClO2-(aq) + O2(g) (basic solution)
Cr2O72-(aq) + CH3OH(aq) ---->  HCO2H(aq) + Cr3+(aq) (acidic solution)