1.CaCa(OH)2CaCO3

2.NaNaOHNaCl

3.AlBr3Al(OH)3AlCl3

Ответы:

Ca → Ca(OH)2 → CaCO3

1.Ca + 2H2O = Ca(OH)2↓ + H2

2.Ca(OH)2 + CO = CaCO3 + H2

Na → NaOH → NaCl

1.2Na + 2H2O = 2NaOH + H2↑

2.FeCl3 + 3NaOH → Fe(OH)3↓ + 3NaCl

 AlBr3 → Al(OH)3 → AlCl3

1.AlBr3 + 3KOH = Al(OH)3↓ + 3KBr

2.Al(OH)3 + 3 HCl(разб.) = AlCl3 + 3H2O