Question

true false magnesium combines with oxygen of air to form magnesium oxide​

Answer 1

Answer:

when 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.

true

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Answer 2

Answer:

TRUE

Explanation:

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. Activation energy is the minimum energy required in order for a chemical reaction to proceed. When the magnesium metal burns it reacts with oxygen found in the air to form Magnesium Oxide. A compound is a material in which atoms of different elements are bonded to one another. 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. 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).

2Mg(s)+O2(g)→2MgO(s)+energy(1)

Magnesium is also capable of reducing water to the highly-flammable hydrogen gas, which will be ignited by the excess heat given by the reduction reaction.

Mg(s)+2H2O→Mg(OH)2(s)+H2(g)(2)

Magnesium also reacts with carbon dioxide to form magnesium oxide and carbon:

Mg(s)+CO2→2MgO(s)+C(s)(3)

Hence, carbon dioxide fire extinguishers cannot be used for extinguishing magnesium fires either. Burning magnesium is usually quenched by using a Class D dry chemical fire extinguisher, or by covering the fire with sand to remove its air source.