Identify the type of reaction: Na_(2)CO_(3)arrow Na_(2)O+CO_(2) single replacement combination decomposition combustion double replacement

In this reaction, Sodium Carbonate ( ) breaks down into Sodium Oxide ( ) and Carbon Dioxide ( ). From the appearance of the reaction, we deduct that a single substance breaks down to form two or more simpler substances. This category of reaction aligns best with Decomposition reactions. Single replacement reactions are such where an element reacts with a compound and takes the place of another element in that compound. A combination (or synthesis) reaction describes when two or more substances combine to form a single product. Combustion reactions occur when a substance merges with oxygen, coming out with the products of water and typically Carbon Dioxide--this isn't our case here. Finally, double replacement reactions describe two compounds partaking in the reaction and the positive ions switch places to form two new compounds. None of these types fit our criteria apart from decomposition reactions.