Bài làm:
1) 2Na + 2HCl → 2NaCl + H2
2) Fe + 2HCl → FeCl2 + H2
3) MgO + 2HCl → MgCl2 + H2O
H2O + MgO → Mg(OH)2
hoặc MgO + H2SO4 → MgSO4 + H2O
H2O + MgO → Mg(OH)2
+/ 2Na+ 2HCl\(\rightarrow\) 2NaCl+ H2\(\uparrow\)
+/ Fe+ 2HCl\(\rightarrow\) FeCl2+ H2\(\uparrow\)
+/ MgO+ H2SO4\(\rightarrow\) MgSO4+ H2O
2Na+ 2H2O\(\rightarrow\) 2NaOH+ H2\(\uparrow\)
2NaOH+ MgSO4\(\rightarrow\) Mg(OH)2\(\downarrow\)+ Na2SO4