Why should a magnesium ribbon be cleaned before burning in air?

Hint: Magnesium is a crucial mineral, playing a task in over 300 enzyme reactions within the form. Its many functions include helping with muscle and nerve function, regulating pressure level, and supporting the system.

Complete step by step answer:
Magnesium ribbon should be cleaned with sandpaper before burning within the air to get rid of the magnesia layer from the ribbon which can prevent or curtail the burning of magnesium ribbon. Unwanted impurities deposited on the magnesium ribbon will be removed and only pure magnesium are often used for the reaction.
Magnesium is chemically very active, it takes the place of hydrogen in boiling water and a good number of metals are often produced by thermal reduction of its salts and oxidized forms with magnesium. Magnesium is labelled because the eighth most abundant element and about $2\%$ of earth’s crust is constituted by Magnesium.
An adult human being contains around $25 gram$ (g) of magnesium, $50–60\%$ of which is contained in our skeletons. The rest part is present in muscle, soft tissues, and bodily fluids.
Many people within the u. s. don't get enough magnesium in their diet, though deficiency symptoms are uncommon in otherwise healthy people.
In seawater, it's the foremost plentiful element present. It's not only found in seawater but also in underground brines and salty layers. After aluminium and iron, magnesium is the third most abundant structural metal within the earth’s crust.

Note: Magnesium is employed in products that take pleasure in being lightweight, like car seats, luggage, laptops, cameras and power tools. it's also added to molten iron and steel to get rid of sulfur. As magnesium ignites easily in air and burns with a bright light, it's utilized in flares, fireworks and sparklers.