A good show of appreciation is a proper-ty

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Across
  1. 3. 4, 8, 15, 16, 23 and 42
  2. 6. to change the order or position of something
  3. 7. something that is made of all the same atoms or groups of atoms
  4. 9. During a chemical reaction, atoms do not ______ from one type to another.
  5. 10. different substances have different __________
  6. 12. a thing or things belonging to someone; possessions collectively
  7. 14. a building or buildings and the land belonging to it or them
  8. 16. During a chemical reaction, atoms rearrange to form ______ groups of atoms.
  9. 17. The Law of Conservation is not ______
Down
  1. 1. ______ vary in the type or number of atoms that make up the group.
  2. 2. ______ are similar to and different from what they represent in important ways.
  3. 4. the relative size of things
  4. 5. The atoms found in the products of a chemical reaction must have been present in the ______ as well.
  5. 8. an ending substance that is made during a chemical reaction
  6. 9. (2 words) letters and numbers showing the types and number of atoms that repeat to make up a substance
  7. 11. a starting substance that is part of a chemical reaction
  8. 13. something that can be observed about a substance, such as color, smell, or boiling point
  9. 15. Substances have different properties because they are made of different groups of ______