State one environmental effect caused by sulfur dioxide in the air.
Coal-fired power stations give off sulfur dioxide as a pollutant. This sulfur dioxide is stopped from entering the atmosphere by flue gas desulfurisation, FGD. Name the compound in FGD that reacts with sulfur dioxide.
Coal-fired power stations also release oxides of nitrogen such as NO. NO is formed when nitrogen, $\text{N}_2$, reacts with oxygen. Construct the equation that represents this reaction.
Draw a dot-and-cross diagram to represent the bonding in a nitrogen molecule. Include only the outer-shell electrons.
Explain why the reaction rate between nitrogen and oxygen increases as temperature rises.
Nitrogen dioxide, $\text{NO}_2$, reacts with water to produce a mixture of dilute nitric acid, $\text{HNO}_3$, and dilute nitrous acid, $\text{HNO}_2$. $2\text{NO}_2 + \text{H}_2\text{O} \rightarrow \text{HNO}_2 + \text{HNO}_3$. Nitrogen dioxide reacts with aqueous sodium hydroxide to produce two different salts and water. Construct the equation that represents this reaction.
Nitric acid is a strong acid. Nitrous acid is a weak acid. Describe how a weak acid differs from a strong acid.