science crossword

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Across
  1. 4. Zn in the periodic table
  2. 8. Al in the periodic table
  3. 10. S in the periodic table
  4. 12. anything that occupies space and has mass
  5. 15. process in which molecules move from an area of higher consintration to an area with lower consintration
  6. 16. invisible negitivaly charged particle that orbits the nucleous of an atom
  7. 17. O in the periodic table
  8. 18. change that results in two or more substances react to create a new substance
  9. 20. a substance that helps a chemical act more quickly
  10. 22. a part of a chemical reaction
  11. 24. orbit of electrons around the nuculous of an atom
Down
  1. 1. Ca in the periodic table
  2. 2. ll, brittle element that does not conduct electricity
  3. 3. He in the periodic table
  4. 5. a change in state or appearance
  5. 6. mixing a substance with air or water to make the substance less consintrated
  6. 7. mass in one atom of an element
  7. 9. NOx(g); major air pollutant; forms when nitrogen combines with oxygen as a result of fuel combustion; gives smog its characteristic brown colour; major source: motor vehicles
  8. 11. a system in which nothing can enter and nothing can leave
  9. 13. Fe in the periodic table
  10. 14. a new substance formed in some kind of reaction
  11. 19. shiny, malleable, ductile element that conducts electricity
  12. 21. element that has both metallic and non-metallic properties
  13. 23. another word or poisonous
  14. 25. H in the periodic table