Chemistry Comes Alive! Volume 1
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Stoichiometry
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Reaction of Magnesium with Carbon Dioxide
Burning Magnesium in Dry Ice
Play movie (1 minute 9 seconds, 4.2 MB)
Magnesium is placed in a cavity in a block of dry ice. The magnesium is ignited... and covered with another block of dry ice. Despite the absence of air, the magnesium continues to glow, due to its reaction with carbon dioxide. Because of this reaction, carbon dioxide cannot be used to extinguish magnesium fires. The reaction products are white magnesium oxide and black carbon.
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Molecular Representation
Magnesium plus carbon dioxide reacts to give carbon and magnesium oxide.
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Equivalent Amounts
Slide 1: Before the reaction there are two carbon dioxide molecules and four magnesium atoms.
Slide 2: After the reaction is complete, four formula units of magnesium oxide and two carbon atoms are present.
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Excess Carbon Dioxide
Slide 1: Before the reaction there are four carbon dioxide molecules and four magnesium atoms.
Slide 2: After the reaction is complete, four formula units of magnesium oxide and two carbon atoms are present. Two carbon dioxide molecules remain.
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Excess Magnesium
Slide 1: Before the reaction there are three carbon dioxide molecules and eight magnesium atoms.
Slide 2 After the reaction is complete, six formula units of magnesium oxide, two magnesium atoms, and three carbon atoms are present.
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© 1997 Division of Chemical Education, Inc., American Chemical Society. All rights reserved.