Chemistry crossword

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Across
  1. 2. liquid,solid,gas are all _____'s of matter
  2. 4. neutral particle in the nucleus of an atom
  3. 5. positively charged particle in the nucleus of an atom
  4. 7. substance reacts with another substance or substances in a chemical to create new substances with different properties
  5. 9. pure substance formed when at least one metal and one non-metal combine
  6. 10. pure substance that can't be broken down into other substances
  7. 11. chemical combination of two or more elements in a specific ratio
  8. 14. number of protons in the nucleus of one atom of an element
  9. 17. horizontal row of elements in the periodic table
  10. 19. an experiment in which all reactants and all products are accounted for
  11. 20. mass of one atom of an element calculated from the total protons
  12. 22. the first name of a man who experimented with the behavior of gases in the 1660's
  13. 23. invisible negatively charged particle that orbits the nucleus of an atom
  14. 25. a chemical reaction that releases energy
Down
  1. 1. vertical column of elements in the periodic table
  2. 3. a chemical reaction that absorbs energy
  3. 6. slow chemical change that ocurs when oxygen in the air reacts with a metal
  4. 8. pure substance formed when non-metals combine
  5. 12. ability of a system to conduct electricity or heat
  6. 13. what a chemical is made of ex 1 atom of ... and 1 atom of ...
  7. 15. an experiment in which one or more products of a chemical reaction can escape
  8. 16. atoms that have become electrically charged because of loss or gained electrons
  9. 18. anything that has mass and occupies space
  10. 21. how an element looks
  11. 24. Workplace Hazardus Materials Information System