(1)2Al+6H +==2Al 3++3H 2↑或2Al+3Cu 2+==2Al 3++3Cu;2Cu+O 2+H 2O+CO 2==Cu 2(OH) 2CO 3
(2)白色沉淀生成,后沉淀逐渐溶解至消失;Al 3++3OH -==Al(OH) 3↓、Al(OH) 3+OH -==AlO 2 -+2H 2O
(3)①3MnO 2+4Al
3Mn+2Al 2O 3;②MnO 2+H 2O 2+2H +==Mn 2++O 2↑+2H 2O
(1)2Al+6H +==2Al 3++3H 2↑或2Al+3Cu 2+==2Al 3++3Cu;2Cu+O 2+H 2O+CO 2==Cu 2(OH) 2CO 3
(2)白色沉淀生成,后沉淀逐渐溶解至消失;Al 3++3OH -==Al(OH) 3↓、Al(OH) 3+OH -==AlO 2 -+2H 2O
(3)①3MnO 2+4Al
3Mn+2Al 2O 3;②MnO 2+H 2O 2+2H +==Mn 2++O 2↑+2H 2O