chemistry

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Across
  1. 2. have a shiny appearance
  2. 3. substances containing one kind of atom
  3. 4. two or more different atoms chemically combined
  4. 6. dull not shiny
Down
  1. 1. change reversible-can be turned back
  2. 2. two or more atoms chemically combined
  3. 4. change not reversible- can't be turned back
  4. 5. two or more different substances that are not chemically combined