Why Chemistry?

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Across
  1. 4. The periodic table element that is used to represent Superman's home planet
  2. 6. The symbol for the element in garlic and onion that causes tears
  3. 8. Term for a substance that can dissolve in water and conduct electricity, often found in sports drinks
  4. 9. A strong acid found in your stomach that helps with digestion
  5. 13. Physicist who won the Nobel Prize for explaining the photoelectric effect
  6. 14. A popular brand of soda that originally contained lithium
  7. 16. A type of reaction where substances combine to form new compounds
  8. 19. Author of "The Disappearing Spoon" about the history of the periodic table
  9. 22. The car from "Back to the Future" that ran on a fictional fuel called plutonium
  10. 24. What element is used to make different coloured glow sticks
  11. 25. Famous periodic table researcher known for her work in radioactivity
  12. 26. The element commonly used in party balloons
  13. 28. The element commonly used as a tracer in PET scans
  14. 29. The reaction between acid and base that forms salt and water
  15. 31. The element on the periodic table that shares its name with a Norse God
  16. 33. A sugar found in milk
  17. 35. The number of protons in a carbon-12 atom
  18. 38. The science that helps us understand the composition of substances
  19. 39. The famous detective created by Sir Arthur Conan Doyle who used chemical knowledge to solve crimes
  20. 41. Element responsible for making bananas radioactive
  21. 42. A substance used to preserve bodies in ancient Egypt that is now commonly used in fertilizer
  22. 43. The chemical compound that makes jalapenos spicy
Down
  1. 1. The compound responsible for the smell of rotten eggs
  2. 2. The fictional high school chemistry teacher in "Breaking Bad"
  3. 3. The fictional element used to power Tony Stark's Iron Man suit
  4. 5. The element that is responsible for the red colour in rubies
  5. 7. Famously exclaims "D'oh! I missed!" when attempting chemistry experiments
  6. 10. This gas is essential for respiration and combustion
  7. 11. A chemical reaction involving the loss of electrons
  8. 12. The process of converting sugar to alcohol, often used in brewing
  9. 15. The element that gives Mars its red colour
  10. 17. The element featured in the song by Tom Lehrer, known for its short half-life
  11. 18. The only liquid metal at room temperature
  12. 20. "Laughing gas"
  13. 21. The famous and useful chart where the only letter that doesn't appear is J
  14. 23. Found on the surface of Mars, contributing to its red colour
  15. 27. The element that makes fireworks vibrant green in colour
  16. 30. A substance that changes colour in the presence of an acid or base
  17. 32. Chemistry is the science of _________
  18. 34. The solid form of carbon dioxide
  19. 36. A polymer used to make bottles and containers
  20. 37. The chemical responsible for the smell of freshly cut grass
  21. 40. The only noble gas that forms stable compounds with other elements