What is the balanced chemical equation for the reaction that takes place between bromine and sodium iodide?

Br₂ + 2NaI →  2NaBr + I₂

Explanation:

This is the reaction:

Br₂ + 2NaI →  2NaBr + I₂

It's a sort of redox, where the bromime is reducted to bromide and iodide is oxidated to iodine.

Br₂ + 2e⁻ → 2Br⁻

2I⁻ → I₂ + 2e⁻

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.