Magnesium ribbon is a thin strip of reactive metal that burns with a dazzling white flame, making it a favourite classroom experiment for teaching chemical reactions. In this activity, students first clean the magnesium ribbon with sandpaper to remove the dull oxide layer so it ignites easily and burns uniformly in air. When heated strongly, the ribbon combines with oxygen to form a white ash of magnesium oxide, releasing a large amount of heat and light in an exothermic combination reaction. This simple experiment not only explains why the ribbon must be cleaned before burning but also helps students understand important concepts like reactivity, oxidation, and basic nature of metal oxides in a real‑life laboratory setting.