Запишите уравнения реакций замещения.
1) $Zn + HCl → ... + ...$
2) $Al + ... → Al_{2}(SO_{4})_{3} + ...$
3) $... + HBr → MgBr_{2} + ...$
4) $CuCl_{2} + Cr → CrCl_{3} + ...$
5) $Fe_{2}O_{3} + Mg → ... + ...$
1) $Zn + 2HCl = ZnCl_{2} + H_{2}$
2) $2Al + 3H_{2}SO_{4} = Al_{2}(SO_{4})_{3} + 3H_{2}$
3) $Mg + 2HBr = MgBr_{2} + H_{2}$
4) $3CuCl_{2} + 2Cr = 2CrCl_{3} + 3Cu$
5) $Fe_{2}O_{3} + 3Mg = 2Fe + 3MgO$
