Download - Kinetic theory (a)
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Kinetic TheorySolids, liquids and gases
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States of matterRemember, all substances are made
up of tiny particles that are moving.The arrangement of these particles
and the way that they are moving determine the properties of the material.
The states of matter are:◦Solid◦Liquid◦Gas
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SolidsFixed shape.Fixed volume.High density.Will not flow.Particles in a solid vibrate about
a fixed position. The more energy, (heat) in the solid, the faster these particles vibrate.
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LiquidsNo fixed shape.Fixed volume.Less dense than solids.Will flow.Particles in a liquid can move
more freely around each other. As the liquids is heated, the movement becomes more energetic.
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No fixed shape.No fixed volume.Very low density, (allows them to
be compressed).Will flow.Particles of gas are moving
around randomly all the time. Collisions between the particles and their container causes pressure.
Gases
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Changes of state
Solid Liquid Gas
Melting Evaporation
Freezing Condensation
Sublimation
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Changes of stateAs we heat solids the particles
start to vibrate more – they gain kinetic energy.
We notice the increase in kinetic energy of the particles as an increase in temperature.
If the particles are moving rapidly enough, then the solid will melt.
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Changes of stateAs we heat liquids the movement
of the particles becomes even more energetic.
If the particles move fast enough then they can break the attractive forces between the particles and move independently.
The liquid evaporates to form a gas.
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Brownian motionNamed after the botanist
Robert Brown (1773-1858).
Observed pollen grains moving randomly in water.
Thought it might be due to a “life force” in the pollen.
However, also observed the movement in non-living particles.
Similar effect can be seen in gases.
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Brownian motionBrownian motion was not
explained until Particle Theory was developed.
Particles in liquids and gases are constantly moving and bump into other particles, such as pollen grains.
This causes the random movements of the grain that was observed.
A good example is the movement of smoke particles in air.
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Brownian motion
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Kinetic TheoryWhat can you remember?
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States of matterRemember, all substances are made
up of tiny particles that are moving.The arrangement of these particles
and the way that they are moving determine the properties of the material.
The states of matter are:◦Solid◦Liquid◦Gas
substancesparticlesarrangement
moving
Solid
LiquidGas
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SolidsFixed shape.FixedHigh density.Will not flow.Particles in a solid vibrate about
a fixed position. The more energy, (heat) in the solid, the faster these particles vibrate.
shape.volume.density.
flow.vibrate
position. heatfaster
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LiquidsNo fixed shape.Fixed volume.Less dense than solids.Will flow.Particles in a liquid can move
more freely around each other. As the liquids is heated, the movement becomes more energetic.
shape.volume.dense solids.flow.
freely
heated,energetic.
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No fixed shape.No fixed volume.Very low density, (allows them to
be compressed).Will flow.Particles of gas are moving
around randomly all the time. Collisions between the particles and their container causes pressure.
Gases
shape.volume.density,
compressedflow.
randomly Collisions
pressure.
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Changes of state
Solid Liquid Gas
Melting Evaporation
Freezing Condensation
Sublimation
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Changes of stateAs we heat solids the particles
start to vibrate more – they gain kinetic energy.
We notice the increase in kinetic energy of the particles as an increase in temperature.
If the particles are moving rapidly enough, then the solid will melt.
heatvibrate kinetic
energy
temperature.particles
melt.
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Changes of stateAs we heat liquids the movement
of the particles becomes even more energetic.
If the particles move fast enough then they can break the attractive forces between the particles and move independently.
The liquid evaporates to form a gas.
heat movementenergetic.
particlesattractive
independently.evaporates gas.
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Brownian motionNamed after the botanist
Robert Brown (1773-1858).
Observed pollen grains moving randomly in water.
Thought it might be due to a “life force” in the pollen.
However, also observed the movement in non-living particles.
Similar effect can be seen in gases.
Robert Brown
pollen randomly
“life force”
non-livinggases.
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Brownian motionBrownian motion was not
explained until Particle Theory was developed.
Particles in liquids and gases are constantly moving and bump into other particles, such as pollen grains.
This causes the random movements of the grain that was observed.
A good example is the movement of smoke particles in air.
Particle Theory
movingparticles,
random
smoke particles
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Brownian motion