Extra Credit

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Across
  1. 3. a mixture in which elements are not uniformly spread out
  2. 6. does not depend on the amount of matter present
  3. 8. temperature at which all three states of matter may exist
  4. 12. An atoms or group of atoms that can have a positive or negative
  5. 14. energy is released
  6. 16. observation made with a measuring instrument
  7. 18. an atom or group of atoms with a positive charge
  8. 19. matter and energy flow in and out of the system
  9. 21. a substance made up of two or more elements
  10. 22. distance between two crests
  11. 23. takes up space
Down
  1. 1. depends on amount of matter present
  2. 2. energy required to change the temperature of a system
  3. 4. a mixture in which elements are uniformly spread out
  4. 5. how efficient the solution will be
  5. 7. define the space of the system
  6. 9. all matter and energy is contained within the system
  7. 10. descriptive
  8. 11. manage the inputs and outputs of a system
  9. 13. must have 8 valence electrons in its outer shell
  10. 15. matter made up of two or more different substances
  11. 17. an atom or group of atoms with a negative charge
  12. 18. limitations of a design
  13. 20. energy is absorbed