Puzzle

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Across
  1. 3. – High-pH substance
  2. 5. – Low-pH substance
  3. 6. – Ionic compound
  4. 9. – Charged atom
  5. 10. – Fixed-shape matter
Down
  1. 1. – Conductive element
  2. 2. – Undergo chemical change
  3. 4. – Combine substances
  4. 7. – Flowing state of matter
  5. 8. – State of matter