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States of MatterTEXTBOOK PAGES 190-192
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What is matter?
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Matter
Anything that occupies space and has
mass
Made up of microscopic particles
Within a substance all particles are the same
Different substances have different particles
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What are the states
(phases) of matter?
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States of Matter
Every substance in the world around us exists in
one of the following states of matter:
Solid
Liquid
Gas
(Plasma)
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What is the difference
between a solid, liquid
and gas?
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Solids
Have a definite shape
Have a definite volume
Difficult to compress
Do not flow (keep their shape)
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Liquids
No definite shape
Have a definite volume
Difficult to compress
Flow easily
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Gases
No definite shape
No definite volume
Take up the space given
Easy to compress
Flow easily
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Why do the different
states of matter behave
differently?
It’s all about the particles…
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Particle Model
The particle model is a way of
representing matter through the use of
particles
Matter is made up of tiny microscopic
particles (atoms)
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Particle Model
Why is this useful?
It allows us to represent each state of
matter and helps explain the differences
in their properties and behaviours!
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Particle Model - Solids
Particles arranged in regular way
Strong forces/bonds holding them
together
Can’t move out of position
Don’t change shape or volume
Can only vibrate a bit
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Particle Model - Liquids
Particles in contact but can slide over each other
Weak forces holding them together
No regular arrangement of particles
Always takes on the shape of the container
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Particle Model - Gases
Particles are not touching
Very weak forces between particles
Complete freedom of movement; always moving and colliding
Has no shape of its own
Always takes on the shape of the container
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Particle Model
-Neatly arranged
-Strong forces of
attraction between
particles (physical
bonds)
-No real movement of
particles
-Close together but not
as structured as a solid
-Weak forces of
attraction between
particles
-Particles can slide over
each other
-Far apart
-No forces of
attraction between
particles
-Move a lot!
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Why can we compress
gases but not solids or
liquids?
Think about the particles…
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Add Pressure Compressible!
Add Pressure Incompressible!
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Phase Changes
Substances can move from one phase to another through the addition or removal of energy
More energy = more particle movement!
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Solids
Liquids
GasesSublimation
Deposition
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Adding
Energy
Removing
Energy
Increase Temperature
Decrease temperature
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Phase Changes
The temperature at which a solidstarts to become liquid is called the melting pointAt this point, both the solid and liquid
states exist together
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Phase Changes
The temperature at which a liquid starts to become a gas is called the boiling point
At this point, both the liquid and gas states exist together
This is why you see bubbles form when you boil water – that is the gas being formed from the liquid
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Add Energy Add Energy
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Why does water
evaporate from puddles if
it didn’t reach the boiling
point?
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Evaporation vs Boiling Point
Note: a substance doesn’t necessarily have to be heated to its boiling point to evaporate!
The particles near the surface can get energy from the sun and this can be enough to cause a change of state