Balance the following decomposition reaction:

A1203 -
Al +
_02
A reducing agent ( gains / loses ) electrons while an oxidizing agent ( gains / loses ) electrons
In an endothermic reaction the total bond energy in the reactants is (greater / less than)
the bond energy of the products so energy is (released / absorbed) by the reaction

The balanced decomposition reaction is:

2Al2O3 -> 4Al + 3O2

A reducing agent gains electrons, while an oxidizing agent loses electrons.

In an endothermic reaction, the total bond energy in the reactants is greater than the bond energy of the products, so energy is absorbed by the reaction.