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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. To observe a combustion reaction which does not require oxygen

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Reaction of Magnesium with Carbon Dioxide

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  1. Reaction of Magnesium with Carbon Dioxide Magnesium metal burns in an atmosphere of carbon dioxide producing light and a black residue

  2. 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

  3. Demonstration • Once activation energy was supplied, magnesium continued to burn in a tank filled with carbon dioxide • A black substance was produced

  4. Concepts 1. Relative Stability 2. Combustion Reactions 3. Single Replacement Reactions

  5. 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

  6. 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

  7. 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

  8. 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

  9. 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

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