Achunk of mg metal is lit on fire. it creates a super bright white light. once the fire is out there is just a white power left. how do you explain what happened?

A chemical reaction between Mg metal and oxygen that produced magnesium oxide (white powder).

Explanation:

Solid magnesium (Mg metal) can react with when it is lit. This produces magnesium oxide which is whitish in color. The balanced equation for the chemical reaction is shown below:

⇒

In the reaction above, Mg is the solid magnesium and MgO is the magnesium oxide which is a white powder.

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