Atomic Theory Basics
This scientific theory states that all matter is made of tiny particles called atoms.
What is Atomic Theory?
In solids, particles are arranged in this way.
What is tightly packed in a fixed position?
Gas particles are arranged this way.
What is very far apart?
Liquids have definite volume but no definite _______.
What is shape?
When temperature increases, particle motion does this.
What is increases?
This scientist proposed one of the first modern atomic theories in the early
Who is John Dalton?
The motion of particles in a solid is best described as this.
What is vibrating in place?
Gas particles move in this type of motion.
What is rapid, random motion?
Compared to solids, particles in liquids move this way.
What is slide past each other?
The energy of motion is called this.
What is kinetic energy?
True or False: Atoms in a solid completely stop moving.
What is False?
Solids have a definite shape and definite _______.
What is volume?
Gases have no definite shape and no definite _______.
What is volume?
Liquids take the shape of this.
What is their container?
As particles gain energy, matter may change from solid to liquid in this process.
What is melting?
These are combinations of two or more atoms chemically bonded together.
What are molecules?
As temperature increases, particle motion in a solid does this.
What is increases (vibrates faster)?
Why are gases compressible?
Because there is a lot of empty space between particles.
Why can liquids flow?
Because particles are close together but not fixed in place.
The change from liquid to gas is called this.
What is evaporation (or vaporization)?
Why do scientists use models to study atoms?
Because atoms are too small to see directly.
Explain why solids keep their shape using particle motion.
Because particles are tightly packed and only vibrate, they cannot move past one another.
Describe how particle motion explains why gases fill an entire room.
Particles move freely and spread out in all directions.
Describe particle spacing in a liquid compared to a solid.
Particles are slightly farther apart than in a solid.
Using atomic theory, explain why heating a gas in a closed container increases pressure.
Particles move faster, collide more often and with more force against the container walls.