$(i)$ Name the products formed when sodium hydrogen carbonate is heated.
$(ii)$ Write the chemical equation for the reaction involved in the above.

(N/A) $(i)$ When sodium hydrogen carbonate $(NaHCO_3)$ is heated, it decomposes to form sodium carbonate $(Na_2CO_3)$, water $(H_2O)$, and carbon dioxide $(CO_2)$ gas.
$(ii)$ The balanced chemical equation for the thermal decomposition of sodium hydrogen carbonate is:
$2NaHCO_3(s) \xrightarrow{\Delta} Na_2CO_3(s) + H_2O(l) + CO_2(g)$