Why does a magnesium ribbion have to be cleaned with sand paper before burning?

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Magnesium ribbon gets gets corroded as it gets in touch with air, so it needs to be cleaned before burning.
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Graduate Personal Tutor

To remove the oxide layer that is formed by being in contact with air. Sand paper will scratch off this layer so that this oxide layer does not prevent the reaction.
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Tutor

Magnesium, being a reactive metal in the activity series, gets easily reacted when comes in contact with oxygen. Thus magnesium oxide is formed.In order to get appropriate results, it has to be cleaned, so that magnesium oxide is removed and the experiment is successfully performed.
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B.sc

The magnesium ribbon contain a layer of magnesium oxide ..to remove that layer it is cleaned by sand paper.
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BE, R V College Of Engineering, Bangalore.

Magnesium ribbon should be cleaned before burning it in air to remove the oxide layer from it which may prevent or slow down the burning of magnesium ribbon.
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I Am Well Qualified and Experienced Tutor

When exposed to air many metals will slowly react with oxygen in the atmosphere to form metal oxides and Magnesium is one of those metals. You are probably familiar with rust which is simply the oxide that forms when iron is exposed to oxygen in the air. With magnesium, the oxide layer forms a white...
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When exposed to air many metals will slowly react with oxygen in the atmosphere to form metal oxides and Magnesium is one of those metals. You are probably familiar with rust which is simply the oxide that forms when iron is exposed to oxygen in the air. With magnesium, the oxide layer forms a white coating on the outside of the metal that will slow down or interfere with the burning process. The ribbons should be sanded with a fine sandpaper, therefore, to remove the layer. Burning magnesium results in magnesium oxide and also some magnesium nitride (reaction with nitrogen in the air). Burning speeds up the conversion of magnesium to magnesium oxide in air. read less
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When exposed to air many metals will slowly react with oxygen in the atmosphere to form metal oxides and Magnesium is one of those metals. You are probably familiar with rust which is simply the oxide that forms when iron is exposed to oxygen in the air. With magnesium, the oxide layer forms a white...
read more
When exposed to air many metals will slowly react with oxygen in the atmosphere to form metal oxides and Magnesium is one of those metals. You are probably familiar with rust which is simply the oxide that forms when iron is exposed to oxygen in the air. With magnesium, the oxide layer forms a white coating on the outside of the metal that will slow down or interfere with the burning process. The ribbons should be sanded with a fine sandpaper, therefore, to remove the layer. Burning magnesium results in magnesium oxide and also some magnesium nitride (reaction with nitrogen in the air). Burning speeds up the conversion of magnesium to magnesium oxide in air. read less
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An oxide layer is formed when exposed to air and atmosphere so magnesium ribbon should be cleaned to remove the oxide layer
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When exposed to air many metals will slowly react with oxygen in the atmosphere to form metal oxides and Magnesium is one of those metals. You are probably familiar with rust which is simply the oxide that forms when iron is exposed to oxygen in the air. With magnesium, the oxide layer forms a white...
read more
When exposed to air many metals will slowly react with oxygen in the atmosphere to form metal oxides and Magnesium is one of those metals. You are probably familiar with rust which is simply the oxide that forms when iron is exposed to oxygen in the air. With magnesium, the oxide layer forms a white coating on the outside of the metal that will slow down or interfere with the burning process. The ribbons should be sanded with a fine sandpaper, therefore, to remove the layer. Burning magnesium results in magnesium oxide and also some magnesium nitride (reaction with nitrogen in the air). Burning speeds up the conversion of magnesium to magnesium oxide in air. read less
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So that magnesium particle are easy to identify on burning.
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