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Reaction of Magnesium with Carbon Dioxide. Magnesium metal burns in an atmosphere of carbon dioxide producing light and a black residue. Purpose. To observe a combustion reaction which does not require oxygen

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reaction of magnesium with carbon dioxide

Reaction of Magnesium with Carbon Dioxide

Magnesium metal burns in an atmosphere

of carbon dioxide producing light and a black

residue

purpose
Purpose
  • To observe a combustion reaction

which does not require oxygen

  • To understand oxygen transfer from a covalent compound to a metal to form an ionic compound
demonstration
Demonstration
  • Once activation energy was supplied, magnesium continued to burn in a tank filled with carbon dioxide
  • A black substance was produced
concepts
Concepts

1. Relative Stability

2. Combustion Reactions

3. Single Replacement Reactions

1 relative stability
1. Relative Stability
  • Substances may be extremely unreactive under one set of conditions and extremely reactive under others
  • All substances have different reactivity characteristics relative to others
  • Mg is stable as the element yet when it reacts it reacts violently with evolution of much heat and light
2 combustion reactions
2. Combustion Reactions
  • A combustion reaction is a reaction that liberates heat and light
  • Magnesium undergoes combustion under very different (dissimilar) conditions
    • air with both oxygen and nitrogen
      • air will support life
    • carbon dioxide
      • carbon dioxide will not support life
  • Magnesium is so reactive it does not distinguish between the two conditions but reacts under both
3 single replacement reactions
3. Single Replacement Reactions
  • A single replacement reaction is of the form
    • A + BC B + AC
  • When such a reaction occurs it must be concluded that A is more reactive than B toward
    • A takes B away from C
    • We say that A has “replaced” B
conclusions
Conclusions
  • The magnesium burned in a carbon dioxide atmosphere without oxygen
  • The reason the magnesium burned was because it combined with the oxygen in the carbon dioxide leaving elemental carbon behind
  • Thus, magnesium was more reactive than carbon toward oxygen
comments
Comments
  • The combustion reaction is represented by the following chemical equation

2Mg + CO2 2MgO + C

  • The magnesium has been oxidized and the carbon in carbon dioxide has been reduced to elemental carbon