What you’ll learn5 learning objectivesChoose one objective for a focused lesson, or study the complete topic.12.1.1Lack of reactivity of nitrogen, using triple• Explain the lack of reactivity of nitrogen, using triple bond strength and lack of polaritySyllabus objective12.1.2And explain• Describe and explain:: (a) the basicity of ammonia, using the Brønsted–Lowry theory; (b) the structure of the ammonium ion and its formation by an acid–base reaction; (c) the displacement of ammonia from ammonium salts by an acid–base reactionSyllabus objective12.1.3NOx sources and catalytic removal• State/explain: the natural and man-made occurrences of oxides of nitrogen and their catalytic removal from the exhaust gases of internal combustion enginesSyllabus objective12.1.4Atmospheric NOx and photochemical smog• Understand: atmospheric oxides of nitrogen (NO and NO 2) can react with unburned hydrocarbons to form peroxyacetyl nitrate, PAN, which is a component of photochemical smogSyllabus objective12.1.5Role of NO and NO2 in the formation of acid• Describe the role of NO and NO2 in the formation of acid rain both directly and in their catalytic role in the oxidation of atmospheric sulfur dioxideSyllabus objective