Read the school development plan and write sentences to describe it.

1) (NH4)2Cr2O7 = Cr2O3+N2+4H2O
2) N2+3H2=2NH3
3) 4NH3+5O2 (Pt, t)=4NO+6H2O
4) 2NO+O2=2NO2
5) 2NO2+2NaOH(разб)=NaNO2+NaNO3+H2O
6) 2NaNO3=2NaNO2+O2
Или: 4NaNO2=2Na2O+2N2+3O2