Chemistry and the unseen science

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Across
  1. 5. what variant of mirror focuses light into one location
  2. 6. an extremely unrealistic superhero Durand talks about eating a lot
  3. 7. The Lightest element
  4. 8. who got ran over by a reindeer in a song by Elmo Shropshire
  5. 10. Juan Jose discovered this element in 1783
  6. 11. only transfers from hot to cold
  7. 13. first number of all numerical answers followed by mlft
  8. 15. a far cooler name for the previous questions answer
Down
  1. 1. how often should you tell a chemistry joke
  2. 2. what type of electrons are typically discussed
  3. 3. Released when magnesium is heated
  4. 4. Durand's favorite element
  5. 9. The universal conversion of elements
  6. 11. first name of hydrogens discoverer
  7. 12. can absolute zero be achieved
  8. 14. if the theoretical yield of an experiment is 4.63 g H2O and the experiments Product is 2.36 g H2O what is the percent yield