It's Monday and here's a crossword

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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. 7. (2 words with no space) one of the products made when gasoline is burned
  3. 8. the relative size of things
  4. 9. make up a substance
  5. 11. something that is made of all the same atoms or groups of atoms
  6. 12. a starting substance that is part of a chemical reaction
Down
  1. 1. (2 words with no space) one of the products made when gasoline is burned
  2. 2. the most important characteristic in a person (in Mr. Scott's opinion anyway)
  3. 4. the country where Mr. Scott studied abroad for a semester
  4. 5. "To infinity, and ______!"
  5. 6. different substances have different __________
  6. 10. the thing that rearranges in a chemical reaction to make new products