4. This question concerns the laboratory preparation of ammonia.(NH3) by reacting a mixture of ammonium chloride and calcium Hydroxide
(a) (i) Why is it advisable to grind the mixture of ammonium chloride and calcium hydroxide?
(ii) State the reaction condition
(2 marks)
(b) Write an equation for the reaction (1 mark)
(c) State the drying agent used (1 mark)
(d ) Ammonia gas is used as a reducing agent for Copper (II) oxide.
(i) Write an equation to show the reduction of NH3
(ii) State one observation when the Copper (II) oxide is reduced
(3 marks)
(e) Give one large scale use of
(i ) Nitrogen
(ii ) Ammonia
(2 marks)
Total 10 marks
5. Sulphur dioxide reacts with air according to the equation below
2SO2(g) + O2(g) ⇔ 2S03(g) ΔH = -196KJ/mol
(a) (i) Explain the meaning of ΔH = -196 KJ/mol
(ii) Stale two (2) reaction conditions for the above reaction
(3 marks)
(b) (i) State Le chatelier’s principle
(ii) What will happen to the equilibrium position when;
Pressure is increased?
Temperature is?
(3 marks)
(c) What volume of oxygen is required to produce 300 cm3 of SO3 at room temperature and pressure? (2 marks)
(d) State one environmental hazard of SO2 (1 mark)
(e) Give one large scale use of SO3 (1 mark)
Total 10 marks
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