(1)4Na+O2=2Na2O
(2)2Na+O2=Na2O2
(3)2Na+2H2O=2NaOH+H2↑
(4)①2Na+Cl2=2NaCl
②4Na+TiCl4 = Ti+4NaCl
(5)2Na2O2+2CO2=2Na2CO3+O2
(6)2Na2O2+2H2O=4NaOH+O2↑
(7)Na2O+CO2=Na2CO3
(8)Na2O+H2O=2NaOH
(9)适量2NaOH +CO2=Na2CO3+H2O
(10)过量NaOH +CO2=NaHCO3
(11)NaOH +HCl=NaCl+H2O
(12)2NaCl+2H2O = 2NaOH+H2↑+Cl2↑
(13)Na2CO3+CO2+H2O=2NaHCO3
(14)2NaHCO3 = Na2CO3+CO2↑+H2O
(15)Na2CO3+2HCl=2NaCl+H2O+CO2↑(反应相对NaHCO3慢)
(16)NaHCO3+HCl=NaCl+H2O+CO2↑ (反应相对Na2CO3 快)
(17)2Na+CuSO4+2H2O=Cu(OH)2↓+Na2SO4+H2↑
(18)NaH+H2O=NaOH+H2↑
(19)2Na+S = Na2S
自己注意条件,这里打不了
没有写的参看其它人的答案