Page 174 - Science Course 1 (Book 1)

Mo5-L3b: How Does Matter Change From One State to Another?

Condensation STATE OF MATTER
is the change of
state from a gas
to a liquid. Liquid

Gas

Sublimation
Adding thermal energy to matter causes the
is the change of state from a solid to a gas without particles that make up the matter to increase in
going through the liquid state. kinetic energy, potential energy, or both.

Thermal Energy v. Temperature as Solid
Changes to Liquid

Temperature Increases Melting T increases
Liquid
PE little change
T constant
PE change
Deposition
is the change of state of a gas to a solid without T = temperature
going through the liquid state. Solid (average kinetic
T increases
PE little change energy)
PE = potential
energy

Thermal Energy Increases

Freezing is a process that is the opposite
of melting.
The temperature at which matter changes from the
liquid state to the solid state is its freezing point.

Let’s Begin

Solid to Liquid or Liquid to Solid

To change matter from a solid to a liquid, thermal
energy must be added.

Once a solid reaches the melting point, additional
thermal energy is used by the particles to overcome
their attractive forces, the particles move farther
apart and potential energy increases.

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