Oquizy

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

Xinyi saw a poster showing carbon monoxide and asked John, “Where does it come from?” Which is a common source of carbon monoxide in urban areas?

Breathing of humans Decomposition of plants Incomplete combustion of petrol in cars Lightning

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)

148 g 18 g 37 g 74 g

Xinyi asked John why sulfur dioxide is harmful. What is a harmful effect of sulfur dioxide?

Causes acid rain Enhances photosynthesis Increases ozone formation Makes water less dense

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?

It exists as single atoms It has a low boiling point It has a strong triple covalent bond It is denser than oxygen

A student sets up two sealed flasks: one with oxygen and methane, and one with oxygen and nitrogen dioxide. Both are exposed to UV light. Which flask would most likely contribute to the formation of ground-level ozone?

Both flasks equally Neither flask Only the methane flask Only the nitrogen dioxide flask

Quiz: Chemistry - Maintaining Air Quality