chemistry

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Across
  1. 5. : something that goes in the air
  2. 6. notice things
  3. 8. compound: a substance formed
Down
  1. 1. the study of objects
  2. 2. transform energy
  3. 3. chloride: compound turns into different forms
  4. 4. a group of atoms bonded together
  5. 7. electromagnetic radiation