4. (4) For the following reaction:
   a. Balance the molecular equation
   b. Write the half reaction for the substance that was oxidized

Balancing equations can feel like playing a game of cosmic Jenga! For the specific reaction, start by identifying the reactants and products. Adjust the coefficients to ensure that the number of atoms for each element matches on both sides of the equation, keeping in mind the law of conservation of mass.

When it comes to half-reactions, focus on the substance being oxidized, which is the one losing electrons. For instance, if you determine that substance A is being oxidized to substance B, the half-reaction could look something like this: A → B + n e⁻, where ‘n’ represents the number of electrons lost. Happy balancing!