Nitrogen and compounds of nitrogen

Properties:
+ Nitrogen gas is colorless, odorless, and relatively inert.
+ Nitrogen`s melting point is -209.86° C, boiling point is -195.8°C.
+ Nitrogen`s density is 1.2506 g/l, specific gravity is 0.0808 (-195.8° C) for the liquid and 1.026 (-252° C) for the solid.
+ Nitrogen has a valence of 3 or 5.
Reactions
Nitrogen is generally unreactive at standard temperature and pressure.
Nitrogen reacts with elemental lithium at standard temperature and pressure, it can react with other metals at high temperatures to form nitride.
6 Li + N2 → 2 Li3N
Nitrogen reacts with Hydrogen at 4000C and high pressure to form ammonia
N2 + 3H2  2NH3
Nitrogen react with Oxygen at 30000C to form NO and NO2
N2 + O2  2NO;
2NO + O2  2NO2
SOURCES
78,1%
NITRIC ACID
Physical properties:
+ A colorless liquid (when pure).
+ It is 3/2 times as dense as water.
+ Boiling point of 860C.
+ The commercial form is about 68% pure.
Chemical properties:
A strong acid
Nitric acid is a good oxidizing agent:
8M + 10nHNO3 (very diluted)8M(NO3)n + nNH4NO3 + 3nH2O
10M + 12nHNO3 (diluted)  10 M (NO3)n + nN2 + 6nH2O
8M + 10nHNO3 (diluted)  8M(NO3)n + nN2O + 5nH2O
3M + 4nHNO3 (diluted)  3M(NO3)n + n NO + 2nH2O
11M + 14nHNO3 (diluted)  11M(NO3)n + nN2O + n NO + 3nH2O
NO and NO2
CH4 and CO2
ZnO2 and ZnCl2
NH3 and NH4Cl
H2O and HCl
1. Which of the following pairs of compounds can be used to illustrate the Law of Multiple Proportions?
2. When HCl and NH3 fumes are introduced into opposite ends of a long, dry glass tube, a white ring forms in the tube. Which answer explains this phenomenon?
NH4Cl forms
HCl diffuses faster
NH3 diffuses faster
The ring occurs closer to the end into which
HCl was introduced
The ring occurs in the middle of the tube.
If the setup were corrected, which of these gases could not be collected over H2O?
CO2
NO
O2
NH3
CH4
For the reaction N2O4(g) = 2NO2(g), the Ks expression is
What is the Ks for the above reaction if at equilibrium the concentration of N2O4 is 4.10-2 mol/l and that of NO2 is 2.10-2 mol/l?
1.10-2
2.10-2
2.10-4
4.10-4
8.10-2
For the Haber process, N2 + 3H2 = 2NH3 + heat (at equilibrium), which statement concerning the reaction rate is true?
The reaction to the right will decrease when more N2 is added.
The reaction to the right will decrease when the pressure is increased.
The reaction to the right will decrease when the temperature is increased.
The reaction to the right will decrease when more H2 is added.
The reaction to the right will decrease when NH3 is removed.
The above diagram represents a setup that may be used to prepare and collect
NH3
NO
H2
SO3
CO2
The above apparatus would have to be heated with a Bunsen burner to be used for the preparation and collection of
HCl
H2S
Br2
H2
NH3
Which of the following is(are) true for this reaction?
Cu + 4HNO3  Cu(NO3)2 + 2NO2(g) + 2H2O.
I. It is an oxidation-reduction reaction.
II. Copper is oxidized
III. The oxidation number of nitrogen goes from +5 to +4.
I, II, III
I and II only
II and III only
I only
III only
Aqua regia is a common name for:
nitric acid

Hydrochloric acid

sulfuric acid

ammonia water

a mixture of A and B
Which of the following correctly completes the nuclear reaction:
7N14 + 2He4  ? + 1H1
8O17
9O16
8N17
7N17
8O16