Write a sentence on a piece of paper using two positive and two negative adjectives to describe another student in the class. (Don’t write the name of the student and, please, don’t forget to be polite!)

1)N2o3 ,-HNO2-азотистая 
CO2, H2CO3-угольная 
P2O5, H3PO4 ортофосфорная 
SiO2, H2SiO3 метакремниевая 
SO2- H2SO3-сернистая