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Across
  1. 2. any substance that increases the rate of a reaction without
  2. 6. the construction of complex chemical compounds from simpler ones
  3. 8. a number placed in front of a chemical symbol or formula
  4. 10. substance that is present at the end of a chemical reaction
Down
  1. 1. a insoluble solid that emerges from a liquid solution
  2. 3. system can exchange both energy
  3. 4. system does not allow matter
  4. 5. a substance that is present at the end of a chemical reaction
  5. 7. a substance that delays
  6. 9. reaction in which one element is substituted