\(4Al+3O_2\underrightarrow{t^o}2Al_2O_3\)
\(4K+O_2\rightarrow2K_2O\)
\(2Al\left(OH\right)_3\underrightarrow{t^o}Al_2O_3+3H_2O\)
\(Al_2O_3+6HCl\rightarrow2AlCl_3+3H_2O\)
\(CaCl_2+Fe\left(OH\right)_3\rightarrow\) Không phản ứng
\(BaCl_2+H_2SO_4\rightarrow2HCl+BaSO_4\downarrow\)