Chemistry

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Across
  1. 4. high ph
  2. 8. separating water from salt
  3. 11. heating components to separate liquids
  4. 13. neutral charge
Down
  1. 1. positive charge
  2. 2. negative charge
  3. 3. enhanced greenhouse effect
  4. 5. low ph
  5. 6. liquids reaching boiling temperature
  6. 7. using green house gases to heat the earth
  7. 9. high concentration to a low concentration
  8. 10. particles staying together
  9. 12. 7ph