Bài 27.4 trang 33 Sách bài tập Hóa học 9

(1) C + ${\mathrm{O}}_2$ $\stackrel{\mathrm{t}°}{\to }$ C${\mathrm{O}}_2$

(2) C${\mathrm{O}}_2$ + Ca${\left(\mathrm{OH}\right)}_2$ → CaC${\mathrm{O}}_3$ + ${\mathrm{H}}_2$O

(3) CaC${\mathrm{O}}_3$ → CaO + C${\mathrm{O}}_2$

(4) CaO + ${\mathrm{H}}_2$O → Ca${\left(\mathrm{OH}\right)}_2$

(5) Ca${\left(\mathrm{OH}\right)}_2$ + 2C${\mathrm{O}}_2$ → Ca${\left({\mathrm{HCO}}_3\right)}_2$

(1) ${\mathrm{Fe}}_2{\mathrm{O}}_3$ + 3${\mathrm{H}}_2$ → 2Fe + 3${\mathrm{H}}_2$O

(2) 2Fe + 3${\mathrm{Cl}}_2$ → 2Fe${\mathrm{Cl}}_3$

(3) Fe${\mathrm{Cl}}_3$ + 3NaOH → 3NaCl + Fe${\left(\mathrm{OH}\right)}_3$

(4) 2Fe${\left(\mathrm{OH}\right)}_3$ → ${\mathrm{Fe}}_2{\mathrm{O}}_3$ + 3${\mathrm{H}}_2$O

(5) Fe + HCl → Fe${\mathrm{Cl}}_2$ + ${\mathrm{H}}_2$

(6) Fe${\mathrm{Cl}}_2$ + 2NaOH → Fe${\left(\mathrm{OH}\right)}_2$ + 2NaCl