Kinetic Model of Matter

Kinetic Model of Matter CHANG, FANG-HSIN @ EDISON CHANG PGDE (Sec), July 2006

Kinetic Model of Matter By the end of this lesson, you should be able to:
1. Use Kinetic Model of Matter to:
compare the physical properties ; and
decribe the molecular structure
of the three states of matter: Gas , Liquid and Solid .
2. Understand that Brownian Motion proves Kinetic Model of Matter .
3. Describe the relationship between temperature and molecular motion .
4. Explain pressure of a gas in terms of its molecular motion .

Part One

CAN YOU SEE? m a croscopic m i croscopic

What is this stuff ? What is the Matter ?

Matter = things , ‘ stuff’ and… YOU

What is Matter ? What are YOU made of ?

Mobile Phone Model to represent the real thing =

Scientific Model = solid to represent the real thing

Scientific Model to represent the real thing = water molecule =

Matter can MOVE Brownian Motion How do we know? Here is the proof 

random movement of Liquid or Gas molecules Brownian Motion Matter can MOVE

Dead Cells Brownian Motion Matter can MOVE http://www-micro.msb.le.ac.uk/video/brownian.mov get pushed around by

Matter can MOVE + = Kinetic Energy

Kinetic Model of Matter Matter is made of moving molecules

Name 3 States of Matter

Name 3 States of Matter Gas Liquid Solid

Kinetic Model of Matter = Gas = flowing water molecule

Kinetic Model of Matter = Liquid = flowing water molecule

Kinetic Model of Matter = Solid = vibrating water molecule

Hold on a second!

Are you telling me that ICE CUBES are actually vibrating ?

!!! YES !!! Are you telling me that ICE CUBES are actually vibrating ?

CAN YOU SEE? m a croscopic m i croscopic

m a croscopic Can you see ice cubes vibrate when they are becoming flowing water ?

m a croscopic Can you see ice cubes vibrate when they are becoming flowing water ? NO

vibrating m a croscopic m i croscopic flowing But are ice cubes actually vibrating when they are becoming flowing water ?

vibrating m a croscopic m i croscopic flowing But are ice cubes actually vibrating when they are becoming flowing water ? YES

During melting , ice cubes are vibrating to break the attrative force that holds water molecules together to become flowing water.

Part Two

Kinetic Model of Matter

Who is HOT ???

100 °C 0 °C

Who is HOT ???

Higher Temperature

Kinetic Model of Matter ? Kinetic Energy ?

Kinetic Model of Matter ? Attractive Force ?

Kinetic Model of Matter ? Motion ?

Kinetic Model of Matter Vibrate Flow at fixed position Slow Fast all over the place

Kinetic Model of Matter ? Shape ?

Kinetic Model of Matter Fixed Changing with the shape of container

Kinetic Model of Matter ? Distance between Molecules ?

Kinetic Model of Matter ? Can be Compressed ?

Kinetic Model of Matter NO NO YES! ? Can be Compressed ?

Liquid Nitrogen Gas Nitrogen 25 ° C -72 ° C COMPRESS

Liquid Nitrogen Gas Nitrogen 25 ° C -72 ° C DECOMPRESS

Hand burnt by Liquid Nitrogen

Large Volume Small Volume COMPRESS CO 2

Large Volume Small Volume DECOMPRESS CO 2

Large Volume Small Volume DECOMPRESS HOW? CO 2

Large Volume Small Volume DECOMPRESS

DECOMPRESS ? CO 2

DECOMPRESS ?
Speed ?
Volume ?
CO 2

LIVE +

DECOMPRESS ?
Speed Faster
Volume Larger
CO 2

Pressure Speed of molecular motion

http://eepybird.com/exp214.html You’ve seen nothing yet!

Homework Play Gas Law Program to find out the relationships between: Pressure Molecular Motion V.S Molecular Motion V.S Temperature

http://intro.chem.okstate.edu/1314F00/Laboratory/GLP.htm Gas Law Program

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Kinetic Model of Matter

by EdiSon on Dec 16, 2006

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Kinetic Model of Matter — Presentation Transcript