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Chemistry
States of Matter & Changing State
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Cards (27)
What are the three states of matter?
Solid
,
liquid
, and
gas
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What does particle theory help explain?
How particles behave in different
states
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How are particles modeled in particle theory?
As small
solid
inelastic
spheres
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What holds particles together in solids?
Strong
forces of attraction
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What structure do particles form in solids?
A regular
lattice structure
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Why do solids have a definite shape and volume?
Particles
are fixed in position
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How do particles in solids behave?
They vibrate in their
position
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What happens to solid particles when heated?
They gain
energy
and vibrate more
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What is the temperature at which a solid melts called?
Melting point
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What occurs at the melting point?
Particles
break free of their
bonds
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What are the forces of attraction like in liquids?
Weak
forces
of
attraction
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How are particles arranged in liquids?
Pretty
randomly
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Why do liquids have a definite volume?
Particles
tend to stick
together
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What happens to liquid particles when heated?
They gain
energy
and move faster
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What is the temperature at which a liquid boils called?
Boiling point
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What occurs at the boiling point?
Particles
break bonds and
evaporate
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How do gases behave in terms of shape and volume?
They fill a
container
and have no
definite
shape
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What is meant by random motion in gases?
Particles can travel in any
direction
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What happens to gas particles when heated?
They gain
energy
and travel faster
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What happens to gas in an expandable container when heated?
The gas will
expand
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What happens to gas in a fixed container when heated?
The
pressure
will increase
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What happens when gas is cooled down enough?
Particles
form bonds and
condense
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What happens when a liquid is cooled further?
Particles
form more bonds and
freeze
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What is a limitation of the particle model?
Particles aren't
solid
or
inelastic
spheres
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What does the particle model not include?
Details of
forces
between particles
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Why is the particle model still useful?
It simplifies
complex
concepts
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What is the main purpose of the video?
To explain the
states of matter
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