Mitchell's Chemistry Crossword

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Across
  1. 4. Oxygen, Heat & Fuel belong to the...
  2. 9. 78% of the air
  3. 11. A gas that emit from motor vehicles-starts with C
  4. 14. A chemical reaction that gives off heat
  5. 16. If salt is dissolved in warm water it is a ...?-starts with M
Down
  1. 1. What is the element with symbol of O?
  2. 2. Two different kinds of atoms joined together
  3. 3. A way to stop rusting-starts with G
  4. 5. Electrically charged particle
  5. 6. Metal corrosion is another word for...-starts with R
  6. 7. Form like a blanket in a blanket in the atmoshere
  7. 8. What is the smallest particle in an element
  8. 10. A chemical reaction thats makes surroundings colder
  9. 12. As,Br & I are what?
  10. 13. Another word for burning-starts with C
  11. 15. Carbon Dioxide is a ...?-Starts with C