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A student did not clean a magnesium ribbon before burning it, so it appeared to burn slowly. What is the main purpose of cleaning the ribbon?

Answer and explanation

Correct answer: To remove the magnesium oxide layer from its surface

A thin magnesium oxide layer, \(\mathrm{MgO}\), forms on the ribbon on exposure to air. This layer reduces direct contact between magnesium and oxygen. Rubbing with sandpaper removes the coating, exposing fresh magnesium that reacts readily with oxygen to form \(\mathrm{MgO}\). Cleaning does not increase magnesium's melting point.

Related tags

Chemical ReactionsMagnesium RibbonOxidationMetal OxidesReaction Conditions

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