Chemistry Crossword Puzzle

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Across
  1. 5. Taste Sour
  2. 6. J.J Thompson discovered
  3. 9. Concave/Convex surface of liquid read from bottom
  4. 11. Change altering substance appearance
  5. 12. When substance has characteristics of all phases solid,liquid,gas
  6. 14. Device measures energy absorbed
  7. 17. Increases concentration hydrogen ions
  8. 19. Donates more than one proton per molecule
  9. 20. Transition directly solid to gas
Down
  1. 1. Time for half radioactive atom to decay
  2. 2. Point when Titration changes color
  3. 3. Number of digits in a number that are significant
  4. 4. Taste Bitter
  5. 5. Cannot be created or destroyed
  6. 7. Sum of Protons and Neutrons
  7. 8. Transition directly gas to solid
  8. 10. Reaction when acid and base become salt and water
  9. 13. atoms of same element with different number of neutrons
  10. 15. Mass measured with balance
  11. 16. Electrons must occupy all of the orbitals before pairing
  12. 18. Speeds up chemical reaction