Oquizy

While working on their smog awareness project, Xinyi explains the role of unburnt hydrocarbons and ozone. Which condition is necessary for photochemical smog to form?

High rainfall Low sunlight exposure Only oxygen and nitrogen in the air Presence of sunlight and pollutants

John then decided to introduce sulfur dioxide into the jar 'for fun'. Xinyi immediately started coughing. Which property of sulfur dioxide explains this reaction?

It forms acidic solutions when dissolved in water It is a neutral gas It reacts with oxygen to form ozone It supports combustion

Trying to neutralise the sulfur dioxide, Xinyi grabbed a beaker of calcium hydroxide solution. Which balanced equation shows what happened next?

SO₂ + Ca(OH)₂ → CaSO₃ + H₂O SO₂ + CaCO₃ → CaSO₃ + CO₂ SO₂ + H₂O → H₂SO₄ SO₂ + O₂ → SO₃

John was puzzled by how CFCs damage the ozone layer. Which correctly explains how CFCs destroy ozone?

CFCs break down ozone directly CFCs prevent UV light from reaching ozone CFCs produce oxygen from water vapour Chlorine radicals from CFCs break down ozone molecules

John read that global warming is linked to greenhouse gases. Which pair of gases is mainly responsible for the greenhouse effect?

Carbon monoxide and argon Hydrogen and helium Methane and carbon dioxide Nitrogen and oxygen

In a closed system, the reaction between sulfur dioxide, water, and oxygen forms sulfuric acid. Which trend best describes the pH change during this process?

Gradual increase in pH over time Oscillating pH values over time Sharp drop then plateau at low pH Stable pH throughout the reaction

Quiz: Chemistry - Maintaining Air Quality