Chem 2 exam I

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Tucheer
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160200
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Chem 2 exam I
Updated:
2012-06-26 22:33:10
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CHEM II
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exam 1
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  1. Most shape between atoms, most freedom, highly compressible, assume shape & volume of container?
    Gases
  2. incompressible, assume shape but not volume of container. molecules/atoms can not pass one another 
    liquids
  3. has a definite shape and volume, only movement is vibrational
    solids
  4. what are the two types of solids? 
    • 1. crystaline
    • 2.amorphus 
  5. what is a crystaline solid? 
    atoms or molecules are arranged in well ordered 3D structure. 
  6. What is an amorphus solid like? 
    atoms or molecules have no organization
  7. what happens when a gas goes to a liquid? 
    molecules move closer together. 
  8. How do you change a gas to a liquid? 
    increase the pressure or cool therefore making the molecules move closer together 
  9. what happens when a liquid goes to a gas? 
    requires the molecules to move farther apart
  10. how do you change a liquid to a gas? 
    decrease the pressure or heat thus moving the molecules farther apart
  11. what are intermolecular forces? 
    attraction between atoms or molecules with in a substance. 
  12. intermolecular forces are stronger or weaker then ionic or covalent bonds? 
    weaker
  13. what do phase changes involve? 
    breaking and forming intermolecular forces
  14. when a substance is at its melting or boiling point what is occuring? 
    its going from more order to less, forces are being broken. 
  15. Intermolecular forces from weakest to greatest?
    • -london dispersion forces 
    • -dipole-dipole forces
    • -hydrogen bonding
    • -Ion-dipole forces
    •  
  16. what are london dispersion forces? 
    • -weakest of all intermolecular forces
    • -occurs in all substances 

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