10.3. Air quality and climate
A subsection of Chemistry, 0620, through 10. Chemistry of the environment
Listing 10 of 389 questions
The table shows the mass of air pollutants, in nanograms, in 1000 cm3 samples of air taken over a four month period. mass of pollutant in 1000 cm3 of air / nanograms month oxides of nitrogen sulfur dioxide carbon monoxide ozone particulates April 144.3 5.9 2.5 33.9 21.9 May 114.2 2.0 2.1 39.6 21.7 June 110.2 6.1 1.8 31.5 21.3 July 115.4 2.5 2.6 24.2 19.0 Answer these questions using only the information in the table. Name the pollutant that shows a continual decrease in concentration between April and July. Name the pollutant present in the lowest concentration in May. Calculate the mass of carbonmonoxide in 200 cm3 of the sample of air taken in April.  nanograms Sulfurdioxide contributes to acid rain. State one source of the sulfurdioxide in the air. Give one adverse effect of acid rain on buildings. State one use of sulfur dioxide. Sulfurdioxide is oxidised to sulfurtrioxide, SO3. Complete the chemical equation for this reaction. SO2 + O2 → SO3 Complete the energy level diagram for the oxidation of sulfurdioxide to sulfurtrioxide by writing these words on the diagram: ● ● reactants ● ● products. energy progress of reaction  Explain, using information on the energy level diagram, how you know that this reaction is exothermic. Nitrogenmonoxide is a catalyst in the oxidation of sulfurdioxide to sulfurtrioxide. State the meaning of the term catalyst. Sulfurtrioxide reacts with water to form dilute sulfuricacid. Identify which one of these pH values represents the pH of dilute sulfuric acid. Draw a circle around the correct answer. pH 2 pH 7 pH 9 pH 13 Particulates are tiny solid particles in the air. They show Brownian motion. Identify one statement that best describes Brownian motion. Tick one box. The particles move from a higher concentration to a lower concentration. The particles are smaller than oxygen molecules. Brownian motion is an example of diffusion. The particles move in a random zig-zag motion.  
0620_w20_qp_32
THEORY
2020
Paper 3, Variant 2
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The table shows the mass of air pollutants, in nanograms, in 1000 cm3 samples of air taken over a four month period. mass of pollutant in 1000 cm3 of air / nanograms month oxides of nitrogen sulfur dioxide carbon monoxide ozone particulates August 106.0 3.0 2.1 29.5 18.5 September 147.5 5.5 2.4 21.1 35.5 October 179.3 3.5 2.0 20.3 22.5 November 214.0 3.6 2.6 12.8 29.4 Answer these questions using only the information in the table. Name the pollutant that shows a decrease in concentration between August and November. Calculate the mass of oxides of nitrogen in 250 cm3 of the sample of air taken in August.  nanograms Carbon monoxide is produced by the incomplete combustion of fossil fuels. State the meaning of the term incomplete combustion. Give one adverse effect of carbon monoxide on health. Carbonmonoxide is also produced when methane reacts with steam in the presence of a catalyst. Explain why a catalyst is used in this reaction. Methane is an air pollutant. State one source of methane in the air. Complete the chemical equation for the reaction of carbon monoxide with oxygen. CO + O2 → CO2 Complete the energy level diagram for the reaction of carbonmonoxide with oxygen by writing these words on the diagram: ● ● reactants ● ● products. energy progress of reaction  Explain, using information on the energy level diagram, how you know that this reaction is exothermic. Describe a test for carbondioxide. test result  Identify which one of these pH values represents the pH of a solution of carbondioxide in water. Draw a circle around the correct answer. pH 6 pH 7 pH 8 pH 14 
0620_w20_qp_33
THEORY
2020
Paper 3, Variant 3
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Questions Discovered
389