10. Chemistry of the environment
A section of Chemistry, 0620
Listing 10 of 723 questions
The gases Ar, CO2, N2 and O2 are in clean, dry air. CO, NO, NO2 and SO2 are gases commonly found in polluted air. What percentage of clean, dry air is N2? Give your answer to the nearest whole number.  % Name the process used to separate O2 from clean, dry air. State one major adverse effect of the pollutant SO2. NO and NO2 are produced in car engines. Describe how oxides of nitrogen form in a car engine. Many cars have catalytic converters in their exhaust systems. In a catalytic converter, most of the CO and NO formed in a car engine is changed into less harmful products. Identify these products and state the metal catalyst used. products catalyst  CO is formed from the incomplete combustion of fossil fuels such as methane. Write a chemical equation to show the incomplete combustion of methane. The CO2 in air is part of the carbon cycle. The scheme shows a simple representation of part of the carbon cycle. carbon dioxide in the air animals glucose found in green plants feeding A B State the scientific terms for each of processA and processB. A B  Plants convert glucose into complex carbohydrates. A unit of glucose can be represented as HO OH. Complete the diagram to show the complex carbohydrate formed from three units of glucose. Show all of the atoms and all of the bonds in the linkages.  Complex carbohydrates break down to form simple sugars. State two ways that complex carbohydrates can be broken down into simple sugars.  Name a suitable technique for separating and identifying the individual sugars formed when complex carbohydrates are broken down. 
0620_w19_qp_42
THEORY
2019
Paper 4, Variant 2
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Questions Discovered
723