Hugh's crossword #2

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Across
  1. 5. there's too much of this in a chemistry PhD
  2. 6. having 18 is best, but at this point who really knows (8,8)
  3. 9. bedtime is 9pm to avoid these (4,6)
  4. 10. "your work is not novel or of appropriate standard" (8,3)
  5. 11. *loves* fluorine and goes boom in the glovebox
  6. 12. often taught, they try their best
Down
  1. 1. a crystallographer's nightmare
  2. 2. scary synthesis, early in project (5,3,5)
  3. 3. "what's the ddiference between enantiomers and diastereomers?"
  4. 4. I don't need this if I eat 4 kitkat chunky's
  5. 7. (analytical technique) the chemistry definition of 'faff'
  6. 8. who needs this when you have a crystal structure? (8,5)