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Across
  1. 2. a pure substance that cannot be broken down into simpler substances
  2. 4. a substance formed when two or more elements combine
  3. 5. a state of matter that has a definite volume but takes the shape of its container
  4. 7. anything that has mass and takes up space
  5. 8. a measure of the amount of space an object occupies
  6. 9. the smallest unit of a chemical element
  7. 12. motion the movement of particles in a substance
  8. 13. a measure of the average kinetic energy of particles in a substance
Down
  1. 1. a table that organizes all known elements
  2. 3. a state of matter with a definite shape and volume
  3. 6. characteristics that describe a substance
  4. 10. a group of atoms bonded together
  5. 11. a state of matter with no definite shape or volume