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Magnesium Burning

Magnesium Burning. Magnesium metal burns in air producing intense light. Demonstration. The reaction was initiated in a flame The reaction produced intense light The magnesium reacted with the oxygen and nitrogen in the atmosphere to form solid products. Purpose.

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Magnesium Burning

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  1. Magnesium Burning Magnesium metal burns in air producing intense light

  2. Demonstration • The reaction was initiated in a flame • The reaction produced intense light • The magnesium reacted with the oxygen and nitrogen in the atmosphere to form solid products

  3. Purpose • To observe a metal while it burns

  4. Concepts 1. Combustion Reactions 2. Combination Reactions 3. Energy

  5. 1. Combustion Reactions • “Burning” reactions • Usually organic substances • wood • paper • By definition a combustion reaction is the exothermic reaction of a substance, usually with oxygen (but not always) • Light typically is also a product of the reaction • Metals also burn!

  6. 2. Combination Reactions • General form • A + B C • In this demonstration • 2 Mg + O2 MgO • 3 Mg + N2 Mg3N2 • The oxygen and nitrogen occur naturally in the atmosphere • O2 is 21% of air • N2 is 78% of air

  7. 3. Energy • Two types of energy are produced in this demonstration • heat energy DHf MgO = -601.83 kJ/mole (kiloJoules per mole) • this is said to be the ‘heat of formation’ for MgO • the negative sign indicates the formation is exothermic • light energy • approximately 10% of the energy of combustion occurs as light in this demonstration • more light than any other known reaction

  8. Conclusions • When the energy of activation was applied magnesium burst into flame • Magnesium burned with the intense production of light and heat • The reaction was a combination reaction which used gaseous components from the atmosphere

  9. Comments • This is a redox reaction in addition to a combination and combustion reaction • Mg begins as oxidation number 0 • In both magnesium oxide and magnesium nitride the oxidation number of magnesium is 2+ • magnesium has lost electrons therefore has been oxidized • Flashbulbs contain magnesium filaments

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