Ada's crossword puzzle

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Across
  1. 4. Two or more atoms joined together
  2. 6. a change in matter that does not affect its chemical composition
  3. 7. Material that has mass and takes up some amount of space
  4. 9. the transfer of thermal energy
  5. 10. the amount of matter in an object
  6. 12. an element or compound
  7. 14. a process that changes substances into new substances
  8. 15. A process that involves rearrangement of the molecular
  9. 17. the substances present before a chemical reaction occurs
  10. 18. a pure substance that is formed when two or more different elements combine
Down
  1. 1. the substances that are formed during a chemical reaction
  2. 2. the amount of space that an object occupies
  3. 3. a measure of the average kinetic energy of the atoms in a system
  4. 5. a characteristic of a substance that is measurable or observable during a chemical reaction
  5. 8. a characteristic that can be observed
  6. 11. The ability to do work or cause change; the ability to move an object some distance
  7. 13. a pure substance that cannot be broken down into simpler substances by chemical reactions
  8. 16. the smallest unit of an element that has the properties of that element