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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



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