Chemistry

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Across
  1. 5. H
  2. 6. One kind of atom
  3. 7. any atom that is connected by chemical bonds
  4. 8. H2O
Down
  1. 1. Two or more different elements bound together
  2. 2. visible ingredients
  3. 3. non-visible ingredients
  4. 4. O
  5. 7. Can be separated into components by physical means