John, still full of bad ideas, decided to burn magnesium ribbon in the air sample to 'see what happens'. After burning, what product would remain in the jar?

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

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

Xinyi gave John an exam-style question: 'Calculate the mass of calcium hydroxide needed to neutralise 1 mole of sulfur dioxide gas.' (Molar mass of Ca(OH)₂ = 74 g/mol)

During a Science Week exhibition, John showed a demo where calcium carbonate powder was added to acidic waste gases from a model combustion chamber. Which pollutant was he most likely removing?

Xinyi is learning about atmospheric gases. She found out that nitrogen makes up 78% of dry air and oxygen about 21%. Which feature of nitrogen explains why it does not easily react in the atmosphere?

After reading about greenhouse gases, Xinyi wondered why carbon dioxide is a greenhouse gas even though it is not flammable. Which statement best explains this?

Methane is 25 times more potent than carbon dioxide as a greenhouse gas. Which source is a major contributor to atmospheric methane levels?

During a lab demo, John reacts 0.05 mol of SO₂ with excess CaCO₃ in flue gas desulfurisation. How much CaSO₃ is formed?

Xinyi noticed that oxygen and nitrogen are separated in hospitals for different uses. How are the components of air separated in industrial processes?

During a science demo, Xinyi mixed calcium carbonate with sulfur dioxide. What is the correct reaction involved in flue gas desulfurisation?

John read an article on acid rain affecting monuments. Which reaction explains how sulfur dioxide forms acid rain?