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Model of Matter - The Particulate Nature of Matt ...
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What is all matter made up of?
Small discrete particles
How do the particle of one pure substance look?
They are identical.
How do particles of all matter move?
In constant and random motion.
What does Brownian motion describe?
That all particle of matter are constantly moving in a random manner.
How does Brownian motion caused?
It is caused by the collision between differnet particles. Example: water particles and pollen grains bumping into each other.
How do particles move in a solid?
Unable to move freely, vibrate in fixed positions.
Describe the force of attraction between particles in a solid.
There are very strong forces of attraction.
Describe the arrangement of particles in a solid.
Packed close together in a fixed, regular pattern.
What are the physical properties of a solid?
Definite shape and volume, higher density than liquids or gases, cannot be compressed.
Describe the movement of particles in a liquid.
They are able to slide past one another.
Describe the foces of attraction that hold together the particles in a liquid.
Strong forces of attraction.
Describe the arrangement of particles in a liquid.
Packed close togehter, no fixed regular pattern.
What are the physical properties of a liquid?
No definite shape, fixed volume, lower density than solids, cannot be compressed.
Describe the movement of particles in a gas.
Able to move freely over long distances.
Describe the forces of attraction between particles in a gas.
Weak forces of attraction.
Describe the arrangement of particles in a gas.
Far apart from one another, no fixed regular pattern.
What are the physical properties of a gas?
No definite shape or volume, lowest density, can be compressed.
What happens when matter is heated?
The particle gain energy and vibrate more vigorously, they move further apart, this causes the volume of matter to increase.
What happens during expansion of matter?
The particle gain energy and vibrate more vigorously, they move further apart, this causes the volume of matter to increase.
What happens when matter is cooled?
The particles lose energy and vibrate less vigorously, the particles move closer together causing the colume of matter to decrease.
What happens during contraction?
The particles lose energy and vibrate less vigorously, the particles move closer together causing the colume of matter to decrease.
What happens to the volume of a solid when it is heated?
It expands, gets larger.
What happens to the volume of a solid when it is cooled?
It contracts, gets smaller.
What happens to the mass of matter during expansion and contraction?
Nothing, it remains the same.


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