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Chapter 4 Changes of State
Warm-Up  10/14/10 <ul><li>Two pots of boiling water each cook an egg. One pot is at a high elevation. The other pot is at ...
Energy and Changes of State  <ul><li>A  change of state  is the change of a substance from one  physical  form to another....
 
Melting / Freezing  <ul><li>Freezing point  – liquid changes into solid.  </li></ul><ul><li>Melting Point  -  solid change...
Evaporation/ Boiling  <ul><li>Evaporation:  liquid  at the surface  changes into gas </li></ul><ul><ul><li>Can happen belo...
Pressure  <ul><li>Pressure effects states of matter too:  </li></ul><ul><ul><li>Less pressure = lower boiling point </li><...
Boiling / Condensation  <ul><li>Boiling : liquid to gas </li></ul><ul><li>Condensation : gas to liquid  </li></ul><ul><li>...
Sublimation  <ul><li>When a substance goes directly from a solid to a gas.  </li></ul><ul><li>(Dry Ice)  </li></ul>
Homework  <ul><li>Section Review:  </li></ul><ul><ul><li>Copy down the questions </li></ul></ul><ul><ul><li>Page 119, # 1-...
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Physical Science: Chapter 4, sec 2

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Notes from 10/14/10

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Transcript of "Physical Science: Chapter 4, sec 2"

  1. 1. Chapter 4 Changes of State
  2. 2. Warm-Up 10/14/10 <ul><li>Two pots of boiling water each cook an egg. One pot is at a high elevation. The other pot is at sea level. It takes one minute longer to hard-boil the egg at high elevation. Why? </li></ul><ul><li>(Think pressure and temperature) </li></ul>
  3. 3. Energy and Changes of State <ul><li>A change of state is the change of a substance from one physical form to another. </li></ul><ul><li>To change from one state to another you must add of remove energy (heat). </li></ul>
  4. 5. Melting / Freezing <ul><li>Freezing point – liquid changes into solid. </li></ul><ul><li>Melting Point - solid changes into liquid. </li></ul><ul><ul><li>Same Temperature </li></ul></ul><ul><ul><li>Water : 0º C </li></ul></ul>
  5. 6. Evaporation/ Boiling <ul><li>Evaporation: liquid at the surface changes into gas </li></ul><ul><ul><li>Can happen below boiling point </li></ul></ul><ul><li>Boiling: liquid throughout changes into gas. </li></ul>
  6. 7. Pressure <ul><li>Pressure effects states of matter too: </li></ul><ul><ul><li>Less pressure = lower boiling point </li></ul></ul><ul><ul><li>More pressure = higher boiling point </li></ul></ul>
  7. 8. Boiling / Condensation <ul><li>Boiling : liquid to gas </li></ul><ul><li>Condensation : gas to liquid </li></ul><ul><li>Same temperature : Water 100º C </li></ul>
  8. 9. Sublimation <ul><li>When a substance goes directly from a solid to a gas. </li></ul><ul><li>(Dry Ice) </li></ul>
  9. 10. Homework <ul><li>Section Review: </li></ul><ul><ul><li>Copy down the questions </li></ul></ul><ul><ul><li>Page 119, # 1-7 </li></ul></ul>
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