Changes in matter

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Across
  1. 5. Substance that speeds up a chemical reaction
  2. 7. atoms connected
  3. 9. chemical components
  4. 10. amount of matter
  5. 11. a substance
  6. 12. scientific study of composition structure
  7. 13. chemical substance
  8. 15. transferring heat
  9. 16. atoms combine
Down
  1. 1. attraction of molecules
  2. 2. amount of energy transfer
  3. 3. 3D space
  4. 4. smallest unit matter can be divided into
  5. 6. substances converted
  6. 8. average kinetic energy
  7. 9. stuff,takes up space
  8. 12. elements combine
  9. 14. a pure substance