Giải thích các bước giải:

1,

\(\begin{array}{l}
4P + 5{O_2} \to 2{P_2}{O_5}\\
3Fe + 2{O_2} \to F{e_3}{O_4}\\
{H_2} + FeO \to Fe + {H_2}O\\
S{O_3} + {H_2}O \to {H_2}S{O_4}\\
BaO + {H_2}O \to Ba{(OH)_2}\\
Na + {H_2}O \to NaOH + \dfrac{1}{2}{H_2}
\end{array}\)

2,

\(\begin{array}{l}
Mg + 2HCl \to MgC{l_2} + {H_2}\\
Zn + 2HCl \to ZnC{l_2} + {H_2}\\
2Al + 3{H_2}S{O_4} \to A{l_2}{(S{O_4})_3} + 3{H_2}\\
Na + {H_2}O \to NaOH + \dfrac{1}{2}{H_2}\\
Ba + 2{H_2}O \to Ba{(OH)_2} + {H_2}\\
S{O_3} + {H_2}O \to {H_2}S{O_4}\\
{P_2}{O_5} + 3{H_2}O \to 2{H_3}P{O_4}\\
N{a_2}O + {H_2}O \to 2NaOH\\
CaO + {H_2}O \to Ca{(OH)_2}\\
2K + \dfrac{1}{2}{O_2} \to {K_2}O\\
4P + 5{O_2} \to 2{P_2}{O_5}\\
Fe + 2HCl \to FeC{l_2} + {H_2}\\
F{e_3}{O_4} + 4{H_2} \to 3Fe + 4{H_2}O\\
CuO + {H_2} \to Cu + {H_2}O
\end{array}\)

3,

\({K_2}O\): Kali oxit (oxit bazo)

\(Mg{(OH)_2}\): Magie hidroxyt (bazo)

\({H_2}S{O_4}\): axit sunfuric (axit)

\(AlC{l_3}\): Nhôm clorua (muối)

\(N{a_2}C{O_3}\): Natri cacbonat (muối)

\(C{O_2}\): cacbon dioxit : (oxit axit)

\(Fe{(OH)_2}\): Sắt (II) hydroxyt ( bazo)

HCl: axit cloric (axit)

CuO: đồng (II) oxit (oxit bazo)

\(Ba{(OH)_2}\): Bari hidroxyt (bazo)

NaCl: Natri clorua (muối)