Physical Science Semester Exam Review

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Across
  1. 2. substances such as elements and compounds
  2. 5. reactive because they have 7 valence electrons
  3. 7. properties that can be observed without changing a substance's identity
  4. 9. positively charged ion
  5. 10. smallest unit of an element
  6. 11. model that shows electrons in energy levels
  7. 12. number that determines an element's chemical properties
  8. 16. mixture that looks uniform
  9. 17. number that indicates protons + neutrons
  10. 18. along with flammability, it's a chemical property
  11. 19. gases that have 8 valence electrons
Down
  1. 1. found by dividing mass by volume
  2. 3. number that indicates # of protons
  3. 4. a property that applies to metals that can be hammered into shapes
  4. 6. has a positive charge
  5. 8. vegetable soup is an example of this type of mixture
  6. 13. his law relates pressure to volume
  7. 14. change of state that requires energy to be released
  8. 15. ability of a metal to be drawn into wire