Chemical Reaction Crossword!

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Across
  1. 6. when a complex substance breaks down into simpler substances
  2. 7. the chemical formula for carbon dioxide
  3. 8. The quantity of something(measured by weight)
  4. 9. the letters and numbers that make up a substance
  5. 10. when two substances combine to make a more complex substance
Down
  1. 1. substances that are added together to make a new substance
  2. 2. ensuring both sides are equal
  3. 3. a substance made up of multiple different elements
  4. 4. A very small particle
  5. 5. when two substances mix, this is the by-product