Chemistry Crossword

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Across
  1. 4. catalyst involved in chemical reactions in living things
  2. 5. metal the first column of the periodic table excluding hydrogen,that a really reactive in air and water
  3. 7. at table in which elements are organized by their physical and chemical properties
  4. 11. chemical change that occurs when oxygen in the air reacts with a metal
  5. 12. a pure substance formed when at least on metal and one non metal combine
  6. 13. ability to pound and roll into flat sheets
  7. 17. neutral particle in the nucleus of an atom
  8. 19. workplace hazardous information material system
  9. 20. the degree to which a specified material conducts electricity
  10. 21. Mass of Reactants= Mass of Products
  11. 22. group 18 in periodic table, they are the most stable and nonreactive elements.
  12. 23. substance that helps a chemical reaction proceed more quickly
  13. 24. horizontal row of elements in the periodic table
Down
  1. 1. invisible negatively charged particle that orbits the nucleus of and atom
  2. 2. a pure substance formed when two non metals combine
  3. 3. element that has both metallic and non metallic properties
  4. 6. can be stretched into wire
  5. 8. the mass of an element measured in amu
  6. 9. chemical reaction that absorbs energy
  7. 10. chemical reaction that releases energy
  8. 13. what everything is made up of
  9. 14. shininess of a metal
  10. 15. Irreversible change
  11. 16. number of protons in the nucleus of one atom of an element
  12. 18. positively charged particle in the nucleus of an atom