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)
ClO3-(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)