Class ____ fires involve ordinary combustibles such as wood, paper, cloth, plastics, and rubber.

Which reactions take place near the sensing electrode of an electrochemical NO analyzer?

a. 2H2O ? 4H+ + 4e– + O2 c. 4NO + 2H2O + 2O2 ? 4HNO3 b. O2 + 4H+ + 4e– ? 2H2O d. NO + 2H2O ? HNO3 + 3H+ + 3e–

What are the major elements of discovery?