State which pollutant shows a fall in concentration from August to November.
Determine the mass of oxides of nitrogen in 250 cm$^3$ of the air sample collected in August.
State what is meant by the term incomplete combustion.
Give one harmful health effect of carbon monoxide.
Explain the purpose of using a catalyst in this reaction.
State one source of methane in the atmosphere.
Complete the chemical equation for the reaction between carbon monoxide and oxygen. $\ldots\ldots\text{CO} + \text{O}_2 \rightarrow \ldots\ldots\text{CO}_2$
Complete the energy level diagram for the reaction of carbon monoxide with oxygen by placing these labels on it: • reactants • products.
Explain, from the energy level diagram, how you can tell that this reaction is exothermic.
Describe how you could test for carbon dioxide. test result
Identify which one of these pH values matches the pH of a solution of carbon dioxide in water. Circle the correct choice. pH 6 pH 7 pH 8 pH 14