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What is the main purpose of rubbing magnesium ribbon with sandpaper before burning it?

Answer and explanation

Correct answer: To remove the surface layer of magnesium oxide

A thin layer of magnesium oxide forms on magnesium when it is exposed to air. This layer can prevent direct contact between magnesium and oxygen and hinder burning. Rubbing with sandpaper removes the oxide layer, exposing fresh magnesium so that it burns readily. The purpose is not to make the ribbon thinner.

Related tags

ScienceClass 10Chemical ReactionsMagnesium RibbonOxidationMetal Oxides

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