Christmas and Chemistry

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Across
  1. 2. Type of attraction between oppositely charged ions
  2. 4. Most common element in Christmas dinner (probably)
  3. 8. Keyword for how thick a liquid is
  4. 9. Charge of an electron
  5. 10. Force between covalent molecules
  6. 13. Days of Christmas
  7. 14. Fraction used to fuel planes
  8. 16. Birthplace of Jesus
  9. 18. Frozen H2O
  10. 20. My favourite Christmas film (3,7)
  11. 24. Green Christmassy plant
  12. 26. Electrons in metals are.....
  13. 27. Molecules that have a double bond
  14. 28. Type of combustion that produces CO
  15. 30. Alcohol with one Carbon
  16. 33. Green Christmas-hater
  17. 35. Alkane + halogen reaction type
  18. 37. A catalyst used for cracking
  19. 39. Breaking down long alkanes into shorter ones
  20. 40. Alkane with 4 Carbons
  21. 41. Hollow cage of carbon atoms
  22. 43. Structure of ionic compounds (5,7)
Down
  1. 1. Keyword meaning can be bent or shaped
  2. 3. Test for alkenes (7,5)
  3. 5. Substance with each C bonded to 4 others
  4. 6. Mode of transport for Mary and Joseph
  5. 7. Keyword for electrons in covalent bonding
  6. 11. Test for carbon dioxide
  7. 12. What type of covalent bond does oxygen have?
  8. 15. Gift if you're on the naughty list
  9. 17. Type of bonding in 5 gold rings
  10. 19. Christmassy bird
  11. 21. Molecule that only contains H and C atoms
  12. 22. You can hang these on the Christmas tree
  13. 23. Santa's favourite colour
  14. 25. A famous snowman
  15. 29. Product of ethanol oxidation (8,4)
  16. 31. Element with the atomic number of the wisemen
  17. 32. Bonding in sodium chloride
  18. 34. Alkene with 3 Carbons
  19. 36. Christmas vegetable
  20. 38. Problem caused by sulphur dioxide (4,4)
  21. 42. Maximum number of electrons on second shell