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Phase Changes

Phase Changes. What did one water molecule say to another water molecule about vapor? Don’t worry it’s just a phase he’ll cool down. Characteristics of Phase Changes. States of matter are also referred to as phases .

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Phase Changes

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  1. Phase Changes What did one water molecule say to another water molecule about vapor? Don’t worry it’s just a phase he’ll cool down.

  2. Characteristics of Phase Changes • States of matter are also referred to as phases. • Phase Change: the reversible physical change that occurs when a substance changes from one state of matter to another

  3. PHASE CHANGES

  4. PHASE CHANGES

  5. Phase Change graphic Condensation Vaporization Freezing Melting

  6. Average Kinetic Energy = Temperature Temperature is a measurement of the average kinetic energy of the particles within a substance. Meaning that temperature measures movement of particles. Temperature is proportional to the average kinetic energy of the molecules of a substance. That means if you double the Kelvin temperature of a substance, you double the average kinetic energy of its molecules. When the average kinetic energy of the molecules goes up (a rise in temperature), the average speed of the molecules increases. A change in average kinetic energy is not directly proportional to a change in average speed.

  7. Using Temperature to Indicate Phase Change Whenever there is a plateau there is a phase change. This means that there is two phases of the substance at the same time.

  8. Water Phase Change Graph E D 100 gas C Temperature º C. liquid B 0 A solid Heat (thermal energy)

  9. Water Phase Change Graph E D 100 gas C Temperature º C. liquid B 0 A solid Heat (thermal energy)

  10. Water Phase Change Graph E D condensing 100 boiling C Temperature º C. B freezing 0 melting A Heat (thermal energy)

  11. F Between B and C -Heat change in Potential Energy -Particles get farther apart -Temp. stays same -MELTING Between D and E -Heat change in Potential Energy -Particles get farther apart -Temp. stay same -Boiling Between A and B -Heat change in Kinetic Energy -Particles move Faster -Temp. increase -Solid Between C and D -Heat change in Kinetic Energy -Particles move Faster -Temp. increase -liquid Between E and F -Heat change in Kinetic Energy -Particles move Faster -Temp. increase -Gas D E C B A

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