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Magnesium Burning

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Magnesium Burning Magnesium metal burns in air producing intense light Demonstration The reaction was initiated in a flame The reaction produced intense light The ... – PowerPoint PPT presentation

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Title: Magnesium Burning


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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