Do Now Task: Chemistry crossword

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Across
  1. 4. containing only one element or compound
  2. 5. a mixture that has a purpose
  3. 8. method used to separate crude oil
Down
  1. 1. a method of separating different inks
  2. 2. name of an alkane that contains three carbons
  3. 3. Made from ancient biomass and plankton
  4. 6. Has only single C to C bonds
  5. 7. Has a double C to C bond