Chemical Industry - Nitrogen Chemistry Flashcards
what is the size of the bond enthalpy of an N2 bond?
a very high enthalpy - requires a lot of energy to break
what is the strongest covalent bond to exist?
the triple N2 bond
what are the common oxides of nitrogen?
N2O
NO
NO2
N2O4
what compound contains the lowest state of nitrogen?
ammonia
what part of ammonia acts as a base?
the lone pair of electrons that allows it to form dative covalent bonds with hydrogen ions
what is the test for ammonium ions?
add sodium hydroxide and heat
ammonia will be released as a gas - turns litmus paper red
what is the colour and gas of nitrogen oxide at RTP?
colourless gas, turns into brown NO2 in air
what is the state and colour of nitrogen dioxide at RTP?
brown gas
what is the state and colour of dinitrogen oxide at RTP?
colourless gas
how is nitrogen oxide formed in the nitrogen cycle?
combustion processes, lightning strikes, formed in soil by anaerobic denitrifying bacteria
how is dinitrogen oxide formed in the nitrogen cycle?
formed in the soil by denitrifying bacteria
in the nitrogen cycle, what does anaerobic bacteria do to nitrate (V) ions?
they reduce them to nitrogen molecules
what is the sequence of reduction of nitrate (V) ions to nitrogen molecules in the nitrogen cycle?
NO3-(aq) -> NO(g) -> N2O(g) -> N2(g)
what carries out the reduction of nitrogen in the nitrogen cycle, and in what conditions?
anaerobic bacteria
in the soil - no access to oxygen / air
what is the solubility of NO3- and NO2- ions?
they are both very soluble
