Ионная связь. Sp - гибридизация.
1.<span>Al+Fe2O3--->Al2O3+FE</span>
<span>2.<span>Mg+HCl ----> MGCL+ H2</span></span>
<span><span>3.<span>NaOH2+CO2 ------> NaHCO2</span></span></span>
<span><span><span>4.<span>Ca+H2O ------> Ca(OH)2</span></span></span></span>
1) MgO + 2HCl = Mg(+2)Cl(-1)2 + H2O
2) 2KOH + H2SO4 = K2(+1)SO4(-2) + 2H2O
3) <span>Na2SO4+BaCL2 = 2Na(+1)Cl(-1) + Ba(+2)So4(-2)
4) </span><span>Fe(+3)+H(+1)CI(-1)= не идет реакция</span>