6. Chemical reactions
A section of Chemistry, 0620
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Table3.1 shows the average concentrations, in ng / 1000 cm3, of air pollutants in four different years. Table 3.1 year concentration of air pollutant in ng / 1000 cm3 ammonia hydrocarbons oxides of nitrogen particulates sulfur dioxide 10.6 12.0 15.3 30.1 20.5 11.2 13.0 21.6 28.2 20.0 14.3 15.2 23.5 26.5 25.0 15.5 9.0 14.0 25.2 18.2 Name the pollutant that has the lowest concentration in 2019. Name the pollutant that shows a continuous decrease in concentration from 2019 to 2022. Calculate the average mass, in ng, of sulfurdioxide in a 250 cm3 sample of polluted air in 2020.  mass = ng State one source of sulfurdioxide in the atmosphere. State one adverse effect of sulfur dioxide in the atmosphere. Choose the compound used to remove sulfur dioxide in flue gas desulfurisation. Tick (✓) one box. aluminium chloride calcium oxide methane sulfuric acid  Hydrochloricacid reacts with sodium sulfite. The products are sodium chloride, sulfur dioxide and a liquid which turns anhydrous cobalt(chloride pink. Complete the symbol equation for this reaction. Na2SO3 + HCl → 2NaCl + SO2 +  Name the acidified solution used to test for sulfurdioxide gas and state the observations. acidified solution observations  Ammonia forms an alkaline solution in water. Give the formula of the ion that is present in all alkaline solutions. Choose from the list the pH value for an alkaline solution. Draw a circle around your chosen answer. pH 1 pH 4 pH 7 pH 13 
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THEORY
2023
Paper 3, Variant 1
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