Hhh

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Across
  1. 2. → correctly
  2. 7. → pure substance
  3. 8. → no charge investigate → find out
  4. 9. → study of substances
Down
  1. 1. → substances combined
  2. 3. → + charge
  3. 4. - repeated design
  4. 5. → force per area
  5. 6. → about machines