Pre-AP Chemistry Chemical Reactions

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Across
  1. 4. Methane
  2. 5. This number is permanent and can not be changed in a compound.
  3. 7. Atoms lose or gain electrons to form these.
  4. 9. This type of reaction represents breaking down of compounds into simpler substances.
  5. 13. This type reaction represents two or more elements or compounds to make more complex substance.
  6. 15. This type of reaction occurs when one element replaces another one in a compound.
  7. 17. This charge is formed by gaining electrons.
  8. 18. This number can be changed to balance a chemical equation.
Down
  1. 1. This type of elements always gain electrons.
  2. 2. This charge is formed by losing electrons.
  3. 3. The small letter that can't be changed, written under a element or a molecule.
  4. 4. The number that can be changed, placed in front of a molecule
  5. 6. This type of reaction represent burning of the oxygen to form water and carbon dioxide.
  6. 8. This type of elements always lose electrons.
  7. 9. This type of reaction occurs when different atoms in two different compounds trade places.
  8. 10. Oxygen
  9. 11. Ammonia
  10. 12. This element is used to burn a compound and form combustion reaction.
  11. 14. The ratio of the actual amount and the theoretical amount in a chemical reaction.
  12. 16. This particle can not be created or destroyed during a chemical reaction.