chemistry crossword

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Across
  1. 3. organic catalyst
  2. 7. negatively charged particle
  3. 9. horizontal column of the periodic table of elects
  4. 10. group 18 on the periodic table of elements
  5. 13. an experiment which all reactants and all products of a chemical reaction are accounted for
  6. 14. vertical column of elements on the periodic table
  7. 15. a reaction that takes place when two or more substances react to form new substances
  8. 16. description of how a substance interacts with other substances such as acids
  9. 18. chemical reaction that releases energy
  10. 20. an element with both metal and non-metal properties
  11. 21. positively charged particle in the nucleus of an atom
Down
  1. 1. a solution in which water is the solvent
  2. 2. chemical combination of two more elements in a specific ratio
  3. 4. substance made of only one type of matter
  4. 5. pure substance formed when non-metals mix
  5. 6. neutral particle the nucleus of an atom
  6. 8. substance that helps speed up chemical reaction
  7. 11. chemical reaction that absorbs energy
  8. 12. change that results when two or more substances react to create a different substance or substances
  9. 17. a formula of symbols that represent a compound
  10. 19. an experiment in which one or more products of a chemical reaction can escape