vocab puzzle

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Across
  1. 2. a reaction in which one element is substituted for another
  2. 7. a chemical reaction in which energy is expelled
  3. 9. Energy stored in the bonds of chemical compounds
  4. 11. the substance created in a reaction
  5. 13. reactions in which the positive and negative ions of two ionic compounds exchange places
  6. 14. symbolic representations of chemical reactions
  7. 15. reactions that occur when two different atoms or molecules interact to form a different molecule or compound
Down
  1. 1. a reaction in which a compound breaks down into two or more simpler substances
  2. 3. a chemical reaction that involves a transfer of electrons between two species.
  3. 4. the ratio between the mass and the amount of substance
  4. 5. chemical reactions in which the reactants absorb heat energy from the surroundings
  5. 6. a unit of measurement that chemists use to find number of something small like single attoms
  6. 8. the substance that changes in a reaction
  7. 10. a type of chemical reaction in which a compound and an oxidant is reacted to produce heat or fire
  8. 12. a number placed in front of a chemical symbol or formula