Question

why shoud a magnesium ribbon be cleaned befor burning in air? ​

Answer 1

Answer:

Because it removes all the dust and non essential product from the ribbon and it is safe to burn it.

Explanation:

Answer 2

Answer:

This is done to remove the layers of magnesium oxide and magnesium carbonate from the surface of magnesium ribbon. These layers are formed as a result of reaction with atmospheric oxygen and carbon dioxide. Magnesium ribbon is cleaned by rubbing with sand-paper after which magnesium ribbon burns smoothly.