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Sort: element, compound, or mixture?

Exercise and reference answers

Items
  1. Item
    Iron (Fe)
    Answer
    left
  2. Item
    Oxygen (O₂)
    Answer
    left
  3. Item
    Gold (Au)
    Answer
    left
  4. Item
    Water (H₂O)
    Answer
    right
  5. Item
    Salt (NaCl)
    Answer
    right
  6. Item
    Air
    Answer
    right
Categories
Left
Element
Right
Compound or Mixture
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