Chemical Reactions

12345678
Across
  1. 2. chemical organic compounds release energy
  2. 3. describes a physical or chemical process that absorbs energy
  3. 6. a substance produced by a chemical reaction
  4. 7. the process of burning something
  5. 8. the initial substance of a chemical reaction
Down
  1. 1. partial burning of a fuel
  2. 4. the chemical element of atomic number 8
  3. 5. describes a physical or chemical process that produces energy in the form of heat and light