Sulfur dioxide | Johnstone’s triangle | 14–16 years

Develop learners’ thinking about elements, compounds and mixtures at three different conceptual levels: macroscopic, sub-microscopic and symbolic. This resource is made up of a single-page Johnstone’s triangle worksheet, which helps learners connect their understanding of compounds, mixtures and elements by considering the context of sulfur dioxide in the atomosphere. The teacher guidance includes model answers.