Name the pollutant whose concentration drops continuously from April to July.
Name the pollutant present at the lowest concentration in May.
Calculate the mass of carbon monoxide in $200\,\text{cm}^3$ of the air sample taken in April.
State one source of the sulfur dioxide in the air.
Give one adverse effect of acid rain on buildings.
State one use of sulfur dioxide.
Complete the chemical equation for this reaction: $\ldots\,\text{SO}_2 + \text{O}_2 \rightarrow \ldots\,\text{SO}_3$.
Complete the energy level diagram for the oxidation of sulfur dioxide to sulfur trioxide by writing these words on the diagram: reactants; products.
Explain, using information on the energy level diagram, how you know that this reaction is exothermic.
State the meaning of the term catalyst.
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.
Identify one statement that best describes Brownian motion. Tick one box.