Balance each half-reaction for atoms and charge: ?

Question

Na --> Na+

Sn4+ --> Sn2+

Fe2+ --> Fe3+

Cl2 --> Cl-

(I never understood how to do this, it's so confusing)

Answer 1

Reduction - Addition of electron

Oxidation- Loss of electron

Na --> Na+  +  e-   (oxidaion)

Sn4+  +  2e-  --> Sn2+  (reduction)

Fe2+ --> Fe3+ + e-  (oxidation)

Cl2    + 2e-   --> 2Cl-  (reduction)

Answer 2

Na >> Na+ + 1e-

Fe2+ >> Fe3+ + 1e-

Cl2 + 2e- >> 2 Cl-