CHEM I NITROGEN AND ITS COMPOUNDS

NITROGEN AND ITS COMPOUNDS
NAME: _______________________________________________________________-
1. The diagram in figure 1 below shows a set up the experiment study it and answers the questions that follow.



Figure 1
a) State the observations that are made in the large bottle.


b) What changes would be observed in the dumb litmus papers A and B.


c) Give the reason why anhydrous calcium chloride was used.

d) What was observed in the mineral wool impregnated with platinum?


e) Write an equation for the reaction that took place in the silica tube.

2. Dilute nitric acid is reacted with sodium hydroxide, Zinc oxide and potassium hydroxide. Give the chemical equations involved in each case.


3. One of the gases which are compounds of Nitrogen is called a laughing gas, which one is it and how did it get its name? Name one physical and one chemical property of this gas.



4. You are provided with the following substances white solids by only heating a small sample of it state how you could identify the three samples; ammonium nitrate, lead nitrate and sodium nitrate.








5. A form three student set up the apparatus as sown below in figure 2 to investigate properties of ammonia study bit carefully and answer the questions that follow


Figure 2


a) Give two sources of ammonia for this experiment.


b) How could ammonia be dried?

c) Why is it necessary to dry ammonia?

d) Identify ;

Liquid X_______________________
Gas P________________________

e) Write an equation for the reaction in the silica tube.

f) What observations will be made in the silica tube?


g) Considering the reaction taking place in the silica tube identify the reduced species oxidized species


6. Determine the oxidation numbers of Nitrogen in each of the following molecules or ions
a) N2O

b) NO

c) NO2

d) NO3-

e) NO2-

f) Mg3N2


7. Suggest a reason why Nitric acid is stored in brown bottles.

8. When a white solid X was heated, it sublimed and produced two gases Y and Z. Z turned blue litmus paper red while Y had irritating smell. Y and Z recombined on a cold surface reforming X. Identify X,Y and Z
X: ____________________
Y: ____________________
Z: ____________________
9. What observations will be made when nitrogen II oxide is bubbled through acidified Fe2SO4 solution?

10. Identify the gases described in the statements below;
a) Colorless gas which turns brown when gently warmed.

b) Relights a glowing splint.

c) Turns brown when exposed to air.

d) Dissolves in water to produce nitric acid and nitrous acids.

e) Colorless gas which when cooled by ice mixture condenses into a pale yellow liquid.

f) Yields a brown complex with acidified iron II sulphate solution.

11. The apparatus in figure 3 below shows how ammonia solution is prepared. Answer the questions that follow;


Figure 3
a) Identify
A: __________________
B: __________________
b) Identify one mistake in the arrangement and suggest a correction for it.


c) Write an equation for the reaction between A and B.




12. Figure 4 below is a set up used to investigate some property of ammonia. After a while a fine jet of water was seen the flask.



Figure 4

a) Why was there a jet into the round bottomed flask?


b) Give and explain any difference in color between the water in the beaker and that in the round bottomed flask.


13. Figure 5 below is a flow chart showing manufacture of nitric acid. Study it carefully and answer the questions that follow.





Figure 5
a) State one source of ammonia

b) Name the catalyst used in the process.

c) Write an equation for the reaction that occurs in the converter.

d) Give the purpose of the oxidizer.

e) List two uses of nitric acid.

f) Identify Q and T.



14. The arrangement below in figure 6 was set up to investigate catalytic oxidation of ammonia.


Figure 6

a) Name the substance labeled X.

b) Explain why platinum wire stays red hot without being heated.


c) State the observations made in the conical flask.


d) Write a chemical equation for
· Production of oxygen gas.

· Reaction of ammonia with the oxygen in the conical flask.
15. The set up below in figure 7 was employed to decompose nitric acid and collect the products of decomposition.


Figure 7



a) Identify gas P.

b) Write an equation for the decomposition of nitric acid.


c) The water in the trough turned acidic. Explain.