ian's crossword puzzle

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Across
  1. 3. a process in which one or more substances are converted to one or more different substances
  2. 4. the basic building block for all matter in the universe
  3. 5. a substance that enters into and is changed by a chemical reaction
  4. 10. The smallest particle of a substance
  5. 12. substance made up of different elements joined together by a chemical bond.
  6. 15. the amount of heat in something
  7. 16. when two or more substances are combined, but each substance keeps its physical properties
  8. 17. a pure substance that is made from a single type of atom
Down
  1. 1. the amount of space the object takes up
  2. 2. do not make a new substance.
  3. 6. form of energy
  4. 7. he attraction of molecules for other molecules of the same kind
  5. 8. If electrons are being shared between two or more atoms
  6. 9. the ability to make energy
  7. 11. one of the major branches of science
  8. 13. any change that causes a new substance to be formed
  9. 14. anything that takes up space and can be weighed
  10. 18. the quantity of matter within a given object