sulfur + oxygen → sulfur dioxide
S(s) + O2(g) → SO2(g)
Sulfur dioxide dissolves in water in the clouds and reacts with oxygen in the air to form sulfuric acid. Overall:
H2O(l) + SO2(g) + ½O2(g) → H2SO4(aq)
This falls from the clouds in acid rain.
Explain why sulfur dioxide is oxidised when it forms sulfuric acid.
It reacts with oxygen and gains oxygen in the reaction.
Effects of acid rain
Acid rain damages the natural and built environment. For example, it:
High temperatures are reached when fuels are burned in engines. At these high temperatures, nitrogen and oxygen from the air can react together to produce oxides of nitrogen. For example:
nitrogen + oxygen → nitrogen monoxide
N2(g) + O2(g) → 2NO(g)
Nitrogen oxide gas can be oxidised further in air to produce nitrogen dioxide gas, NO2.
These two oxides of nitrogen are together called NOx. They are atmospheric pollutants. They can react in sunlight with other substances to produce a hazy, harmful smog.
Write a balanced equation for the reaction between nitrogen monoxide and oxide, forming nitrogen dioxide. Include state symbols in your answer.
2NO(g) + O2(g) → 2NO2(g)