(12分,每空2分)
(1)2Na 2O 2+2H 2O==4NaOH+O 2↑
(2)sp 31∶1 24
(3)O>C>H>Na
(4)2Cl 2+2Na 2CO 3+H 2O==2NaCl+2NaHCO 3+Cl 2O