Question

Complete the reaction \[2Mg + {O_2}\]

Answer 1

Hint: Alkaline earth metals form oxide and hydroxides. The oxides and hydroxides are alkaline in nature and oxides are found in earth’s crust.

Complete step by step answer:
We need to identify the type of bond and reaction.
This is an ionic bond. So, atoms are donating and accepting electrons. This is a synthesis reaction. Magnesium has a charge of \[ + 2\], while oxygen has a charge of \[ - 2\]. The Magnesium metal reacts with oxygen found in air (oxygen gas) to form Magnesium oxide.
\[2Mg + {O_2}(g) \to \,2MgO\,\,\,\,\Delta {H_f} = - 601.83\,kJ/mol\]
Oxygen is a diatomic molecule and is always reacting with elements in the form of oxygen gas \[{O_2}\]. This is also a combination and oxidation reaction.

Additional Information:
Magnesium oxide is odorless and non – toxic. It possesses hardness, high purity and a high melting point. Magnesium oxide appears in a white powder form. It is used for the production of silicon steel sheet, high grade ceramic material and electronic industry material, adhesive and additive in the chemical raw material. It is used in high – frequency magnetic – rod antenna and as a fire retardant used for chemical fiber and plastics trades. It is also used in refractory fiber, refractory material and magnesite – chrome brick, insulating instrument, electricity cable, optical material, material for steel – smelting furnace and other high – temperature furnaces, and used in fuel additive, cleaner, antistatic agent and corrosion inhibitor.

Note:When a piece of Magnesium ribbon is ignited, light and heat are produced. The heat of formation of Magnesium oxide is\[ - 601.83\,KJ/mol\]. Magnesium oxide is a white hygroscopic solid mineral that occurs in nature and is a source of magnesium.