12. Nitrogen and sulfur
A section of Chemistry, 9701
Listing 10 of 350 questions
Nitrogen makes up about 79% of the Earth’s atmosphere. As a constituent element of proteins, it is present in living organisms. Atmospheric nitrogen is used in the Haber process for the manufacture of ammonia. Write an equation for the formation of ammonia in the Haber process. The Haber process is usually carried out at a high pressure of between 60 and 200 atmospheres (between 60 × 105 Pa and 200 × 105 Pa). State two further important operating conditions that are used in the Haber process. For each of your conditions, explain why it is used. condition 1 reason condition 2 reason State one large-scale use for ammonia, other than in the production of nitrogenous fertilisers. The uncontrolled use of nitrogenous fertilisers can cause environmental damage to lakes and streams. This is known as ‘eutrophication’. What are the processes that occur when excessive amounts of nitrogenous fertilisers get into lakes and streams? In many countries, new cars have to comply with regulations which are intended to reduce the pollutants coming from their internal combustion engines. Two pollutants that may be formed in an internal combustion engine are carbon monoxide, CO, and nitrogen monoxide, NO. Outline how each of these pollutants may be formed in an internal combustion engine. CO NO State the main hazard associated with each of these pollutants. CO NO Pollutants such as CO and NO are removed from the exhaust gases of internal combustion engines by catalytic converters which are placed in the exhaust system of a car. What metal is most commonly used as the catalyst in a catalytic converter? Construct one balanced equation for the reaction in which both CO and NO are removed from the exhaust gases by a catalytic converter.
9701_w10_qp_21
THEORY
2010
Paper 2, Variant 1
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Questions Discovered
350