Question

What happens when Potassium nitrate is heated

Answer 1

When Potassium nitrate is heated, it decomposes into Potassium nitrite (KNO₂) and Oxygen (O₂).

The chemical reaction is a decomposition reaction. The balanced chemical equation is
$2{\mathrm{KNO}}_3\left(\mathrm{s}\right)\stackrel{∆}{\to }2{\mathrm{KNO}}_2\left(\mathrm{s}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)$