Unit B Crossword

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Across
  1. 3. a chemical reaction in your body
  2. 6. chemical combination of 2 or more elements
  3. 8. a subatomic particle with a negative charge
  4. 12. release of heat
  5. 15. substances that speed up the reaction rate
  6. 16. consists of a nonmetal and a nonmetal
  7. 18. average mass of an element
  8. 20. when oxygen reacts with another substance to form a new substance that gives off energy
  9. 23. a subatomic particle found in every nucleus, except for hydrogen
  10. 24. an irreversible reaction
  11. 25. the most stable and nonreactive nonmetals
Down
  1. 1. earth metals, less reactive than alkali
  2. 2. a new substance produced in a chemical reaction between reactants
  3. 4. absorption of heat
  4. 5. organic catalyst
  5. 7. consists of a metal and a nonmetal
  6. 9. anything on the periodic table
  7. 10. a substance that reacts with another to create a new substance
  8. 11. made up of one type of matter
  9. 13. most reactive metals
  10. 14. can be in between metals and nonmetals
  11. 17. the number of protons of an atom, determines its place on the periodic table
  12. 19. a slow chemical change that occurs when oxygen reacts with metal
  13. 21. most reactive non metals
  14. 22. a subatomic particle with a positive charge