4Na＋O2＝2Na2O2Na＋O2=Na2O2 2Na+Cl2＝2NaCl 2Na＋S＝Na2S2Na+2HCl=2NaCl+H2↑2Na＋2H2O＝2NaOH＋H2↑2NaOH+CuSO4=Na2SO4+Cu(OH)2↓4Na+TiCl4=4NaCl+Ti（条件为高温）Na+KCl=K+NaCl（条件为高温）2Na+2C2H5OH→2CH3...