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 Change of State:
 Change of a substance to one physical form to another
 Physical changes
 Identity of the substance does not change
 Ex: ice, liquid water, and steam are all the same
substance.
 State of matter is based on the amount of energy in
the substance
 to change the state of matter you add or take away energy.

Ice – little energy

Liquid water – moderate energy

Steam – a lot of energy
Examples of Physical
Properties
 Color, odor, hardness, density,
melting point, boiling point,
state, solubility.
 Melting:
 Change of state from a solid to liquid

Melting ice
 Adding energy increases temperature and causes the particles to
move faster.
 Melting Point:
 Temp. at which a substance changes from a solid to a liquid
 Different substances have different melting points
 Energy added to a solid is used to overcome the attraction
between particles
 Endothermic Change:
 Energy is gained by the substance as it changes state
 Freezing:
 Change of state from a liquid to a solid.
 Freezing Point:
 Temp. at which liquids turn to solids
 Attraction must overcome the motion of the
particles
 Removal of energy will cause the particles to
lock in place
 Exothermic Change:
 Removal of energy
 Evaporation:
 Change of a substance from a liquid to a gas
 Occurs at the surface of a liquid below the boiling
point
 Boiling:
 Change of a liquid to a gas throughout the liquid
 Occurs when the pressure inside the bubbles equals the
outside pressure
 Boiling point changes with atmospheric pressure

Lower the pressure lower the boiling point
 Condensation:
 Change of state from gas to liquid
 Condensation Point:
 Temp. at which a gas becomes a liquid
 Exothermic change
 Energy is removed and particles clump
together when the attraction between them
overcomes the motion
 Sublimation:
 A solid changes directly to a gas
 Endothermic change
 Energy is added and the particles move
quickly breaking the attraction between
them
Change of Phase
Melting solid  liquid
Condensation gas  liquid
Freezing liquid  solid
Evaporation liquid  gas
Sublimation solid  gas
Boiling: Evaporation occurring beneath the
liquid’s surface.
Change of Phase
Melting solid  liquid
Condensation gas  liquid
Freezing liquid  solid
Evaporation liquid  gas
Sublimation solid  gas
Boiling: Evaporation occurring beneath the
liquid’s surface.

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Change of state

  • 1.
  • 2.  Change of State:  Change of a substance to one physical form to another  Physical changes  Identity of the substance does not change  Ex: ice, liquid water, and steam are all the same substance.  State of matter is based on the amount of energy in the substance  to change the state of matter you add or take away energy.  Ice – little energy  Liquid water – moderate energy  Steam – a lot of energy
  • 3. Examples of Physical Properties  Color, odor, hardness, density, melting point, boiling point, state, solubility.
  • 4.  Melting:  Change of state from a solid to liquid  Melting ice  Adding energy increases temperature and causes the particles to move faster.  Melting Point:  Temp. at which a substance changes from a solid to a liquid  Different substances have different melting points  Energy added to a solid is used to overcome the attraction between particles  Endothermic Change:  Energy is gained by the substance as it changes state
  • 5.  Freezing:  Change of state from a liquid to a solid.  Freezing Point:  Temp. at which liquids turn to solids  Attraction must overcome the motion of the particles  Removal of energy will cause the particles to lock in place  Exothermic Change:  Removal of energy
  • 6.  Evaporation:  Change of a substance from a liquid to a gas  Occurs at the surface of a liquid below the boiling point  Boiling:  Change of a liquid to a gas throughout the liquid  Occurs when the pressure inside the bubbles equals the outside pressure  Boiling point changes with atmospheric pressure  Lower the pressure lower the boiling point
  • 7.  Condensation:  Change of state from gas to liquid  Condensation Point:  Temp. at which a gas becomes a liquid  Exothermic change  Energy is removed and particles clump together when the attraction between them overcomes the motion
  • 8.  Sublimation:  A solid changes directly to a gas  Endothermic change  Energy is added and the particles move quickly breaking the attraction between them
  • 9. Change of Phase Melting solid  liquid Condensation gas  liquid Freezing liquid  solid Evaporation liquid  gas Sublimation solid  gas Boiling: Evaporation occurring beneath the liquid’s surface.
  • 10. Change of Phase Melting solid  liquid Condensation gas  liquid Freezing liquid  solid Evaporation liquid  gas Sublimation solid  gas Boiling: Evaporation occurring beneath the liquid’s surface.