crossword puzzle

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Across
  1. 3. spaced occupied by the gas particles
  2. 5. turns blue litmus paper to red
  3. 6. positively charged element
  4. 8. positively charged particle
  5. 9. chemistry of life
  6. 13. dispersed particles
  7. 14. combination of acid and bases
  8. 16. they transform materials into gold
  9. 18. heat is released
  10. 19. it penetrates the wall of the colloidal system
  11. 21. study of matter and the changes it undergoes
  12. 22. use of filtering materials
  13. 26. negatively charged particle
  14. 27. basic unit of matter
  15. 28. negatively charged element
Down
  1. 1. malleable
  2. 2. semi-conductors
  3. 4. contains dispersed particle and dispersing medium
  4. 7. non-malleable
  5. 8. force exerted by the gas molecules
  6. 10. chemical abstract society
  7. 11. heat is absorbed
  8. 12. average kinetic energy of the gas particles
  9. 15. pounds per square inch
  10. 17. charged elements
  11. 20. dispersing medium
  12. 23. international union of pure and applied chemistry
  13. 24. sticks to the surface of the colloidal system
  14. 25. zero charged particle
  15. 28. homogeneous mixture of both solid