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Chapter 3, Section 3. Changes in State. Change of State. Change of State: change of a substance from one physical form to another Change of state happens by: removing or adding energy! Which changes the particle speed, the temperature, and finally the state changes!. ENDO vs. EXO.

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chapter 3 section 3

Chapter 3, Section 3

Changes in State

change of state
Change of State
  • Change of State: change of a substance from one physical form to another
  • Change of state happens by:
    • removing or adding energy!
      • Which changes the particle speed, the temperature, and finally the state changes!
endo vs exo
ENDO vs. EXO
  • Endothermic: Add Energy
    • To add energy, increase the temperature, the particle movement increases
  • Exothermic: Remove Energy
    • To remove energy, decrease the temperature, the particle movement decreases
  • EX:
    • Boiling Water. ENDO or EXO
    • Freeze Water. ENDO or EXO
melting
Melting
  • Endothermic Process
    • Adds energy
    • Temperature increases
    • Particles move faster
    • When a certain temperature is reached, the solid will melt (melting point)
freezing
Freezing
  • Exothermic Process
    • Removes energy
    • Temperature decreases
    • Particles slow down
    • When the liquid reaches a certain temperature, the liquid will become a solid (freezing point)
  • Freezing is the reverse of melting
liquid to gas
Liquid to Gas?

EVAPORATION

BOILING

evaporation
Evaporation
  • Occurs at the surface
  • Endothermic Process
    • Adds energy
    • Temperature increases
    • As the surface reaches a certain temperature, the surface particles change to gas
    • Happens before the liquid reaches its boiling point
boiling
Boiling
  • Occurs throughout the liquid
  • Endothermic Process
    • Adds energy
    • Temperature increases
    • Particles move faster
    • Temperature at which a liquid boils is its boiling point
gas to liquid
Gas to Liquid?

CONDENSATION

condensation
Condensation
  • Exothermic Process
    • Remove energy
    • Temperature decreases
    • Particle movement decreases
    • Particles clump together
    • Temperature at which a gas becomes a liquid is the condensation point
  • Condensation and vaporization are the reverse of each other
solid to gas
Solid to Gas?

SUBLIMATION

sublimation
Sublimation
  • Endothermic Process
    • Adds energy
    • Temperature increases
    • Particle movement increases
ad