2 Na + Cl2 = 2 NaCl

Na2CO3 + 2 HCl = 2 NaCl + CO2 + H2O

2Na + H2 = 2NaH

2 Na + 2 H2O = 2 NaOH + H2

Cu(NO3)2 + 2 NaOH = Cu(OH)2 + 2 NaNO3

2Na + O2 = Na2O2

Na2O2 + 2Na = 2Na2O