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Genie in a Bottle

Genie in a Bottle. A dense cloud of vapor emerges from a flask when a substance is added. Purpose. To produce and observe a cloud of water vapor forced through a narrow opening. Demonstration. The decomposition of hydrogen peroxide into oxygen gas and water was both rapid exothermic

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Genie in a Bottle

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  1. Genie in a Bottle A dense cloud of vapor emerges from a flask when a substance is added

  2. Purpose • To produce and observe a cloud of water vapor forced through a narrow opening

  3. Demonstration • The decomposition of hydrogen peroxide into oxygen gas and water was both • rapid • exothermic • The water was vaporized as it was formed in the reaction • The vapor escaped as a dense cloud

  4. Concepts 1. Decomposition Reactions 2. Exothermic Reactions 3. Vapor

  5. 1. Decomposition Reactions • This reaction in this demonstration is the decomposition of hydrogen peroxide into oxygen gas and water • 2H2O2 2H2O + O2

  6. 2. Exothermic Reactions • This reaction is the decomposition of hydrogen peroxide into oxygen gas and water • 2H2O2 2H2O + O2 • The reaction is exothermic, that is it has a negative heat of reaction In this reaction enough heat is liberated that the water vaporizes

  7. 3. Vapor • Three states of matter • solid • liquid • gas • The gaseous state has its particles separated from each other • Vapor is a partially condensed gas • clusters of particles are present • clusters are visible to the eye

  8. Conclusion • Hydrogen peroxide decomposed to produce water, oxygen, and heat • The water coalesced into droplets in the form of a water vapor cloud

  9. Comments • The hydrogen peroxide used in this demonstration is 10 times more concentrated that the 3% hydrogen peroxide from a drugstore • Hydrogen peroxide is a powerful oxidizing agent and damaging to human tissue

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