Label the following reaction as Synthesis or Decomposition 2Al_(2)O_(3)arrow 4Al+3O_(2) Synthesis Decomposition

The given reaction is $2Al_{2}O_{3}\rightarrow 4Al+3O_{2}$. In this reaction, a single compound (Al2O3) is breaking down into two simpler substances (Al and O2). This is characteristic of a decomposition reaction. In a synthesis reaction, two or more simple substances combine to form a more complex compound. Therefore, the given reaction is a decomposition reaction.