Question

Al→Al2O3→AlCl3→Al(NO3)3→ Al(OH)3→Al2O3→Al

Answer 1

4Al+3O₂=2Al₂O₃
Al₂O₃+6HCl=2AlCl₃+3H₂O
AlCl₃+3AgNO₃=Al(NO₃)₃+3AgCl↓
Al(NO₃)₃+3KOH=Al(OH)₃+3KNO₃
2Al(OH)₃→(t°)→Al₂O₃+3H₂O
2Al₂O₃+Na→(t°;CaF₂;ток)→4Al+3O₂↑

Answer 2

4Al + 3O2 = 2Al2O3
Al2O3 + 6HCl = 2AlCl3 + 3H2O
AlCl3 + 3NaOH = Al(OH)3(осадок) + 3NaCl