Periodic Table

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Across
  1. 1. This is a water molecule
  2. 2. A substance in a chemical reaction
  3. 5. You need this to breathe
  4. 7. A substance in a chemical reaction
  5. 11. It is in milk
  6. 12. This happens when two substances react
  7. 14. This is a molecule with oxygen and carbon
Down
  1. 1. This makes ammonia
  2. 3. When there are more than two atoms combined
  3. 4. This can be made in a chemical reaction
  4. 6. These are on the periodic table
  5. 8. These make molecules
  6. 9. It stands for Na for short
  7. 10. For short it's called Cl
  8. 13. This is an atom in carbon dioxide