There are so many amazing things I wish I could show you

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Across
  1. 3. (2 words with no space) letters and numbers showing the types and number of atoms that repeat to make up a substance
  2. 5. when a chemical reaction has the same number of atoms in the products and reactants, it is ______
  3. 6. to change the order or position of something
  4. 8. something that can be observed about a substance, such as color, smell, or boiling point
  5. 9. something that is made of all the same atoms or groups of atoms
  6. 10. an object, diagram, or computer program that helps us understand something by making it simpler or easier to see
Down
  1. 1. a starting substance that is part of a chemical reaction
  2. 2. Don't stop __________
  3. 3. this law tells us atoms cannot be created or destroyed
  4. 4. an ending substance that is made during a chemical reaction
  5. 7. I wanna dance with ___________
  6. 9. the relative size of things