Question

why should be magnesium ribbon be cleaned before burning? If magnesium ribbon reacted with oxygen then why doesn't burn?​

Answer 1

Explanation:

Magnesium ribbon should be cleaned with sandpaper before burning in the air. ... To remove the Magnesium oxide layer from the ribbon which may prevent or slow down the burning of magnesium ribbon. Unwanted impurities deposited on the magnesium ribbon can be removed and only pure magnesium can be used for the reaction.

When the magnesium metal burns it reacts with oxygen found in the air to form Magnesium Oxide. ... Oxygen and magnesium combine in a chemical reaction to form this compound. After it burns, it forms a white powder of the magnesium oxide. Magnesium gives up two electrons to oxygen atoms to form this powdery product.

Answer 2

Answer:

magnesium is a reactive metal which reacts with air to form magnesium oxide. This magnesium oxide forms a layer over the magnesium ribbon. This layer may slow down the further reaction. To prevent this magnesium ribbon should be cleaned.

magnesium ribbon needs conditions like temperature and air to burn. It doesn't burn only in oxygen it needs temperature as the reaction is endothermic. Therefore magnesium ribbon doesn't burn only in oxygen.

Explanation:

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