Changes in Matter

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Across
  1. 2. absorb heat energy from surroundings
  2. 5. substance that can't be broken
  3. 7. present at reaction start
  4. 8. amount of matter in object
  5. 10. thermal energy transferred between two systems
  6. 12. stuff
  7. 16. the attraction of molecules of the same kind
  8. 17. something that is formed after chemical reaction
Down
  1. 1. a group of atoms
  2. 3. a physical combination of substances
  3. 4. the degree of hotness and coldness
  4. 6. the amount of space something takes up
  5. 9. building block for all matter
  6. 11. substance that speeds up chemical reaction
  7. 13. release energy from chemicals into surroundings
  8. 14. the study of matter
  9. 15. force that holds atoms together
  10. 16. substance formed when elements combine