Write the reaction equation: Na → Na2O2 → Na2O → Na2CO3 | NaOH → NaCl

1) 2Na + O2 = Na2O2 (when sodium interacts with oxygen at a temperature of 300-400 ° C, sodium peroxide is formed);

2) 2Na2O2 = 2Na2O + O2 (when heated, sodium peroxide decomposes into sodium oxide and oxygen);

3) Na2O + CO2 = Na2CO3 (when sodium oxide interacts with carbon dioxide, sodium carbonate is formed);

4) Na2CO3 + Ca (OH) 2 = 2NaOH + CaCO3 (when sodium carbonate interacts with calcium hydroxide, sodium hydroxide and calcium carbonate are formed);

5) NaOH + HCl = NaCl + H2O (when sodium hydroxide interacts with hydrochloric acid, sodium chloride and water are formed).