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Change of state

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Change of state
Change of state
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Change of state

  1. 1.  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
  2. 2. Examples of Physical Properties  Color, odor, hardness, density, melting point, boiling point, state, solubility.
  3. 3.  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
  4. 4.  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
  5. 5.  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
  6. 6.  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
  7. 7.  Sublimation:  A solid changes directly to a gas  Endothermic change  Energy is added and the particles move quickly breaking the attraction between them
  8. 8. 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.
  9. 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.

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