Document 7653179
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Transcript Document 7653179
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
The water was vaporized as it was
formed in the reaction
The vapor escaped as a dense
cloud
Concepts
1.
Decomposition Reactions
2.
Exothermic Reactions
3.
Vapor
1. Decomposition Reactions
This reaction in this demonstration
is the decomposition of hydrogen
peroxide into oxygen gas and
water
2H2O2
2H2O + O2
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
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
Conclusion
Hydrogen peroxide decomposed to
produce water, oxygen, and heat
The water coalesced into droplets in the
form of a water vapor cloud
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