EXO/ENDO

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Across
  1. 2. the process by which one or more substances change
  2. 6. gives off heat and energy
  3. 8. Absorbs heat and energy
  4. 10. a chemical reaction where heat is absorbed
Down
  1. 1. a substance produced during a chemical reaction
  2. 3. a chemical reaction where heat is released
  3. 4. the smallest unit of an element
  4. 5. A substance that takes part in and undergoes change during a chemical reaction
  5. 7. a group of atoms bonded together
  6. 9. energy energy that comes from heat