Chemistry: (2) First Three Notesheets

  1. What is heat?
    The energy transferred between objects due to temp difference
  2. If energy is (-) heat is _____________
    If energy is (+) heat is _____________
    given off, taken in
  3. specific heat
    energy needed to change 1g of a substance to 1 degress Celsius
  4. energy is __________ or ______________ during a phase change
    given off or taken in
  5. Do phase changes change the temp of a substance?
    No, the temp changes AFTER a phase change
  6. phase changes happen when _____________ ____________ are broken or formed
    intermolecular forces
  7. stronger __________ ____________ cause higher ______________ points
    interparticle attractions; melting
  8. evaporation
    happens below boiling point. only particles at surface change to gas
  9. vapor pressure
    pressure caused by vaporized particles
  10. as temperature _____________, vapor pressure _________________.
    increases; increases
  11. When does boiling happen?
    When vapor pressure of liquid equals atmospheric pressure
  12. Normal boiling point
    when atmospheric pressure equals 1 atm
  13. What are two cooling processes?
    • 1) boiling
    • 2) evaporation
  14. How does sweating make you cooler?
    The particles with the highest KE evaporate, leaving cooler particles behind.
  15. At absolute zero what happens to particles?
    They stop moving. No Kinetic Energy
  16. At the liquid state, are particles touching?
  17. Same temperature= same __________ ___________
    Same temperature = same kinetic energy of particles
  18. How do you find the boiling point of a substance?
    Find the temperature at which vapor pressure id the same as atmospheric pressure
  19. In heat transfer, which way does heat always go?
    From the higher temp object to the lower one
  20. If a pot has been boiling for 20 minutes is it less hot, hotter or the same as when it first started to boil?
    The same. As soon as water gets above its boiling point it will turn to gas
  21. What is in between atoms?
    nothing, not even air
  22. What is in a bubble?
    Bubbles are just an invisible form of water
  23. What are four different types of models?
    • 1) analyzing with computers
    • 2) mental
    • 3) mathematic
    • 4) buildings/drawings
  24. What is the difference between tempertaure and heat?
    • heat is a transfer of energy due to temperature difference
    • temperature is how fast particles are moving and how much kinetic energy a substance has
Card Set
Chemistry: (2) First Three Notesheets
matter&density, kinetic theory&temperature, phase changes