Решить:Al+ Cr2O3 =?Al + NaOH + H2O= ?Al+CuO = ?

Question

Решить:
Al+ Cr2O3 =?
Al + NaOH + H2O= ?
Al+CuO = ?

Answer 1

2Al+ Cr2O3 --> 2Cr + Al2O3
2Al + 2NaOH + 2H2O --> 2 NaAlO2 +3 H2
2Al+3CuO --> 3Cu+Al2O3 

Answer 2

1. 2Al + Cr2O3 = Al2O3 + 2Cr
2. 2Al + 2NaOH + 6H2O = 2Na[Al(OH)4] + 3H2↑
3. 2Al + 3CuO = Al2O3 + 3Cu