Chemistry units 1,2,3 Crossword Puzzle

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Across
  1. 4. Change caused by forces or conditions applied from outside a system (____ change)
  2. 7. Negatively charged particle orbiting the nucleus
  3. 10. Substance made of only one type of atom
  4. 11. Type of change where no new substance is formed
  5. 14. Positively charged particle found in the nucleus
  6. 15. Change caused by energy or reactions inside a system (____ change)
  7. 16. State of matter with a fixed shape and volume
  8. 19. Chart organizing elements by atomic number
  9. 20. Change from solid to gas without becoming liquid
Down
  1. 1. Anything that has mass and takes up space
  2. 2. Force applied over a distance
  3. 3. State of matter with no fixed shape or volume
  4. 5. Ionized state of matter found in stars and lightning
  5. 6. Amount of matter in an object
  6. 8. Neutral particle located in the atomic nucleus
  7. 9. The number of protons in an atom’s nucleus
  8. 12. State of matter that flows but has a definite volume
  9. 13. Energy transferred due to temperature difference
  10. 17. Number of electrons in an atom’s outer shell
  11. 18. Mass per unit volume