Beatty 16.1_AMMONIA_(W1)_2023_Answers

1 Beatty Secondary School Science Department (Chemistry Unit) Chemistry 6092 Name: ___________________________________ ( ) Date: _______________ Class: 4E___ TOPIC: AMMONIA (WORKSHEET 1) Learning Objectives: (a) State that some chemical reactions are reversible, e.g. manufacture of ammonia. (b) Describe the use of nitrogen, from air, and hydrogen, from the cracking of crude oil, in the manufacture of ammonia. (c) Describe the essential conditions for the manufacture of NH3 by the Haber process. (d) Describe the use of ammonia to manufacture nitrogenous fertilisers. (e) Describe the displacement of ammonia from its salts and explain why adding calcium hydroxide to soil can cause the loss of nitrogen from added nitrogenous fertiliser. Multiple-Choice Questions 1 The catalyst used in the Haber process is ____________. A copper B iron C hydrogen chloride D nickel ( B ) 2 When 1 mol of nitrogen is reacted with 3 mol of hydrogen a t 250 atm and 450 °C in the presence of an iron catalyst, less than 2 mol of ammonia is formed. Which of the following best explains this observation? A The pressure used was too low. B The temperature used was too low. C The nitrogen and hydrogen used in the reaction contained impurities. D The reaction of nitrogen and hydrogen to form ammonia is reversible. ( D ) 3 Which ion will react with ammonium sulfate to give ammonia gas? A NH4+ B OH– C H+ D Cl– ( B ) 4 All ammonium salts on h eating with sodium hydroxide produce ammonia gas. From which ammonium salt can the greatest mass of ammonia be obtained? A 0.5 mol (NH4)3PO4 B 0.5 mol (NH4)2SO4 C 1.0 mol NH4Cl D 1.0 mol NH4NO3 ( A )

2 5 Which of the following will not react with ammonium salts to give ammonia gas? A limewater B potassium hydroxide C hydrochloric acid D sodium hydroxide ( C ) Use the following information to answer Questions 6 and 7. The Haber process is used to manufacture ammonia gas. The reactio n is exothermic and the chemical equation for the process is: N2(g) + 3H2(g) ⇌ 2NH3(g) 6 Given that the same volumes of nitrogen and hydrogen was used, what is the effect of increasing the pressure inside the reaction vessel on the rate of production and the overall yield of ammonia gas? rate yield A decrease decrease B increase unchanged C increase decrease D increase increase ( B ) 7 Which of the following statements is not true of the Haber process? A The raw material, nitrogen gas, is obtained from the cracking of petroleum. B Liquid ammonia is the product of the Haber process. C Nitrogen and hydrogen gases are compressed at 250 atm during the process. D Unreacted nitrogen and hydrogen are recycled and transferred back into the converter. ( A ) 8 Ammonia is produced by the reaction of the e lements