Physical & chemical changes

1234567
Across
  1. 3. chemical+chemical= (BOOM)
  2. 4. change that cannot be undone
  3. 7. change that can be undone
Down
  1. 1. a substance from a solution
  2. 2. fire=_______
  3. 5. the thing holding atoms together
  4. 6. water to ice