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Phase Changes
Do Now:
What are the names for the phases that
matter goes through when changing
from solid to liquid to gas, and then
bac...
States of Matter - Review
By adding energy, usually in the form
of heat, the bonds that hold a solid
together can slowly b...
Solids
A solid is an ordered
arrangement of
particles that have
very little movement.
The particles vibrate
back and forth...
Liquids
A liquid is an
arrangement of less
ordered particles
that have gained
energy and can move
about more freely.
Their...
Compare the two states:
Gases

By adding energy, solids can change from
an ordered arrangement to a less ordered
arrangement (liquid), and finally...
Each phase change has a specific name,
based on what is happening to the
particles of matter.
Melting and Freezing

The solid, ordered
molecules gain energy,
collide more, and
become less ordered.

The less ordered l...
Condensation and Vaporization

The less ordered gas
molecules loose energy,
slow down, and become
more ordered.

The more ...
Sublimation and Deposition

The more ordered solid
gains energy, the
molecules speed up and
become less ordered gas.
Liqui...
Phase changes are classified as
one of two types:
1. ENDOTHERMIC – The object absorbs
energy from the surroundings. Think
...
Now we can complete the
remaining two columns of
the study guide.
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Phase changes

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Transcript of "Phase changes"

  1. 1. Phase Changes
  2. 2. Do Now: What are the names for the phases that matter goes through when changing from solid to liquid to gas, and then back again?
  3. 3. States of Matter - Review By adding energy, usually in the form of heat, the bonds that hold a solid together can slowly break apart. The object goes from one state, or phase, to another. These changes are called PHASE CHANGES.
  4. 4. Solids A solid is an ordered arrangement of particles that have very little movement. The particles vibrate back and forth but remain closely attracted to each other.
  5. 5. Liquids A liquid is an arrangement of less ordered particles that have gained energy and can move about more freely. Their attraction is less than a solid.
  6. 6. Compare the two states:
  7. 7. Gases By adding energy, solids can change from an ordered arrangement to a less ordered arrangement (liquid), and finally to a very random arrangement of the particles (the gas phase).
  8. 8. Each phase change has a specific name, based on what is happening to the particles of matter.
  9. 9. Melting and Freezing The solid, ordered molecules gain energy, collide more, and become less ordered. The less ordered liquid molecules loose energy, slow down, and become more ordered.
  10. 10. Condensation and Vaporization The less ordered gas molecules loose energy, slow down, and become more ordered. The more ordered liquid molecules gain energy, speed up, and become less ordered. Evaporation only occurs at the surface of a liquid. Boiling occurs throughout the liquid.
  11. 11. Sublimation and Deposition The more ordered solid gains energy, the molecules speed up and become less ordered gas. Liquid phase is bypassed. The less ordered gas looses energy, molecules slow down, and become a solid (frost). Liquid phase is bypassed
  12. 12. Phase changes are classified as one of two types: 1. ENDOTHERMIC – The object absorbs energy from the surroundings. Think of ENDO as “entering”: energy comes into the object. What is happening to the particles? 2. EXOTHERMIC – The object releases energy to the surroundings. Think of EXO as “exiting”: energy goes out of the object. What is happening to the particles now?
  13. 13. Now we can complete the remaining two columns of the study guide.
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