A Chemistry Halloween

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Across
  1. 3. A compound with a pH of less than 7.0
  2. 4. Any substance that is consumed in the course of a chemical reaction.
  3. 6. A chemical element in its smallest form
  4. 8. Some sleep here
  5. 10. Spooky Home
  6. 13. Freddy's invitation
  7. 16. Just dying to get in
  8. 18. The alternate definition of "costume"
  9. 21. One of the four fundamental states of matter
  10. 22. Threshold greeting
  11. 23. Heard on the night of the full moon
  12. 25. Lighting the way
  13. 26. Toil and trouble go in here
  14. 28. A Halloween pet
  15. 29. The SI unit of energy
Down
  1. 1. Salem's mascot
  2. 2. The largest one is a flying fox
  3. 5. A negatively charged ion
  4. 6. How close a measured value is to the actual or true value
  5. 7. The electric or magnetic separation of electric charge into a pair of charges of equal magnitude but opposite sign
  6. 9. Vehicle for holiday personalities
  7. 11. We all have one
  8. 12. Glassware used to dispense specific amounts of liquid when precision is necessary
  9. 14. One of the four fundamental states of matter
  10. 15. Arachnid's food trap
  11. 17. One of the four fundamental states of matter
  12. 19. The Headless Horseman's head
  13. 20. One of the four fundamental states of matter
  14. 24. What the night of the living are
  15. 26. A positively charged ion
  16. 27. Pumpkin spice comes to life in...