2)
2H₂S+3O₂=2SO₂+2H₂O
2H₂O+2Na=2NaOH+H₂
2NaOH+CuCl₂=Cu(OH)₂+2NaCl+
Cu(OH)₂=CuO+H₂O
1)Au и Fe c HNO₃ не взаимодействует
NaHCO₃ + HNO₃=NaNO₃+H₂O+CO₂
Na⁺+HCO₃⁻+H⁺+NO₃⁻=Na⁺+NO₃⁻+H₂O+CO₂
HCO₃⁻+H⁺=H₂O+CO₂
Ca(OH)₂+2HNO₃=Ca(NO₃)₂+2H₂O
Zn + 4HNO₃=Zn(NO₃)₃ + 2NO₂ +2 H₂O
N⁺⁵ +1e=N⁺⁴
Zn°-2e=Zn⁺²