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Instant Fire. A drop of acid is added to a mixture of chemicals which burst into flame. Demonstration. The pile of chemicals contained sugar substance oxidized reducing agent potassium chlorate KClO 3 substance reduced oxidizing agent

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Presentation Transcript
instant fire

Instant Fire

A drop of acid is added to a mixture of

chemicals which burst into flame

demonstration
Demonstration
  • The pile of chemicals contained
      • sugar
        • substance oxidized
        • reducing agent
      • potassium chlorate KClO3
        • substance reduced
        • oxidizing agent
  • A rapid oxidation reaction occurred which liberated a large amount of heat and light
purpose
Purpose
  • To observe a spontaneous oxidation reaction of an organic compound
concepts
Concepts

1. Organic Compounds

2. Reaction Kinetics

3. Oxidation Reactions

1 organic reactions
1. Organic Reactions
  • Organic compounds are based on the element carbon
        • there are some 18 million organic compounds
        • there are some 1 million inorganic compounds
  • Organic Reactions
        • can be highly selective, operating on only one part of a molecule at a time
        • can be highly non-selective, converting each carbon atom to the same product as in this demonstration where all carbons are converted to carbon dioxide
2 reaction kinetics
2. Reaction Kinetics
  • How fast a reaction will occur is described by the kinetics of the reaction
  • Five important considerations

1. nature of reactants

2. Intimate mixing of reactants

3. concentration of reactants

4. temperature

5. Catalysis

In this demonstration the reactants are

solid reactants. When a drop of acid is

added they are brought into close contact

a reaction occurs

3 oxidation reactions
3. Oxidation Reactions
  • Oxidation reactions may be
      • Controlled or Uncontrolled
        • controlled burning in a fireplace vs a forest fire
      • Selective or Non-selective
        • oxidizing all atoms or only select atoms in

a molecule

  • The oxidation in this demonstration is
      • Controlled
        • in the sense that it is contained
      • Non-selective
        • in the sense that it converts each carbon atom in sugar to carbon dioxide
conclusions
Conclusions
  • A strong oxidizing agent reacted

with a reducing agent

  • The two solid substances underwent no reaction until brought together by a drop of acid catalyst
  • Carbon in the sugar was oxidized to carbon dioxide
  • Hydrogen in the sugar was oxidized to water
comments
Comments
  • The drop of sulfuric acid may have an additional function

H2SO4 + 2KClO3 2HClO3 + K2SO4

  • The sulfuric acid may react with some of the potassium chlorate to produce chloric acid, itself a strong oxidizing agent