Em tham khảo nha:

\(\begin{array}{l}
a)\\
2K + 2{H_2}O \to 2KOH + {H_2}\\
Ca + 2{H_2}O \to Ca{(OH)_2} + {H_2}\\
N{a_2}O + {H_2}O \to 2NaOH\\
BaO + {H_2}O \to Ba{(OH)_2}\\
{P_2}{O_5} + 3{H_2}O \to 2{H_3}P{O_4}\\
{N_2}{O_5} + {H_2}O \to 2HN{O_3}\\
S{O_3} + {H_2}O \to {H_2}S{O_4}\\
b)\\
4K + {O_2} \xrightarrow{t^0}  2{K_2}O\\
2Ca + {O_2} \xrightarrow{t^0} 2CaO\\
3Fe + 2{O_2} \xrightarrow{t^0} F{e_3}{O_4}\\
4P + 5{O_2} \xrightarrow{t^0} 2{P_2}{O_5}\\
c)\\
F{e_2}{O_3} + 3{H_2} \xrightarrow{t^0} 2Fe + 3{H_2}O\\
CuO + {H_2} \xrightarrow{t^0} Cu + {H_2}O
\end{array}\)

$a)K,Ca,Na_2O,BaO,P_2O_5,N_2O_5,SO_3$ tác dụng được với nước.

$PTHH:$

$2K+2H_2O \to 2KOH+H_2$

$Ca+2H_2O \to Ca(OH)_2+H_2$

$Na_2O+H_2O \to 2NaOH$

$BaO+H_2O \to Ba(OH)_2$

$P_2O_5+3H_2O \to 2H_3PO_4$

$N_2O_5+H_2O \to 2HNO_3$

$SO_3+H_2O \to H_2SO_4$

$b)K,Ca,Fe,P$ tác dụng được với oxi

$PTHH:$

$4K+O_2\xrightarrow{t^0}2K_2O$

$2Ca+O_2\xrightarrow{t^0}2CaO$

$3Fe+2O_2\xrightarrow{t^0}Fe_3O_4$

$4P+5O_2\xrightarrow{t^0}2P_2O_5$

$c)Fe_2O_3,P,CuO$ tác dụng được với hiđro

$PTHH:$

$Fe_2O_3+3H_2\xrightarrow{t^0}2Fe+3H_2O$

$3H_2+2P\xrightarrow{t^0}2PH_3$

 $CuO+H_2\xrightarrow{t^0}Cu+H_2O$