<span><span>1)
</span>оксид метала+вода</span><span>Na2O + H2O = 2NaOH</span><span>
Al2O3 + 3H2O = 2Al(OH)3</span>
<span>MgO + H2O = Mg(OH<span>)2
2) метал + соль</span></span>
<span>Fe + CuSO4(раствор) = FeSO4(раствор) + Cu</span>
<span>Mg + CuSO4(раствор) = MgSO4(раствор) + Cu</span>