Question

When a magnesium wire is burnt in air,
reaction takes place​

Answer 1

Answer:

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. This is an exothermic reaction. An exothermic reaction is a term that describes a chemical reaction in which there is a net release of energy (heat).

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Answer 2

Answer:

Explanation:

Combination reaction: 2Mg+$O_2$ →2MgO

When a piece of magnesium wire is ignited, light and heat are produced. Purpose/Goal: A quick demonstration which illustrates the concept of an exothermic reaction, as well as one that produces light energy. The heat of formation of magnesium oxide is -601.83 kJ/mol.

When magnesium is in its metal form it will burn very easily in air. However, in order to start the reaction (the burning) the magnesium metal needs a source of energy. The flame provides a source of heat so that the magnesium metal atoms can overcome their activation energy.