HVAC technicians are certainly pro-ducts

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Across
  1. 3. (2 words) the process that will create new substances
  2. 5. a chemical reaction will create this
  3. 8. (2 words) letters and numbers showing the types and number of atoms that repeat to make up a substance
  4. 12. a type of matter with the same properties
  5. 13. something that will change in a chemical reaction
Down
  1. 1. a substance that will change in a chemical reaction
  2. 2. repeat to make up a substance
  3. 4. (2 words) an example of what might happen during a chemical reaction
  4. 6. a group of atoms joined together in a particular way
  5. 7. when you haven't practiced something in a little while, you might be a little…
  6. 9. the atom responsible for making Mars dust red
  7. 10. the name of the reddish-brown substance
  8. 11. small units of matter that combine to make up molecules