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Wednesday, September 3, 2008
chapter 7: kinetic models of matter
7.1- states of matter
SOLID
-fixed shaped
-fixed volume
-high density
-incompressible
-hard and rigid
-needs a large amt of force to change shape
LIQUID
-fixed volume
-NOT fixed shape
-high density
-incompressible
GAS
-NO fixed shape or volume
-low density
-compressible
arrangement of particles.
SOLID
why does solid have high densities?
1.closely packed together.
2.regular patterns.
3. occupy minimum space.
why does solid have fixed volume and shape?
1.particles vibrate about fixed position only.
2.it is held in position by strong INTERMOLECULAR bonds.
LIQUID
why does liquid have high densities?
1.particles randomly arranged
2.particles slightly furher apart.
(compared to solid)
why does liquid have fixed volume BUT will take shape of the object containing them?
1.free to move about.
2.BUT confined within the vessel
3.have attractive forces between particles.
GAS
why does gas have low densities?
1.particles are far apart
2.randomly arranged
3.occupy any available space
why does gas have no fixed volume & shape?
why does gas are highly compressible?
1.particles have very little attraction.
2.move about randomly at very high speed.
------------------------------------------------------------------
BROWNIAN MOTION
defined as:
random movement of mircoscopic particles suspended in fluid
click link to see demostration of the BROWNIAN MOTION
http://www.aip.org/history/einstein/brownian.htm
the brownian motion of smoke will be more vigorous and agitated at a higher temperature because the air molecules have greater speed at higher temperature.
Temperature increase^= LARGER amt of thermal energy is CONVERTED to kinetic energy.
this will cause the molecules to move faster.
~~~~~~~END OF CHAPTER (^^)v~~~~~~~
Posted @ 12:41 AM
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