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