CHEMICAL REACTIONS

Edit Answers
12345678910111213
Across
  1. 2. A number that identifies the ratio of elements in a chemical formula.
  2. 3. The fact that copper turns green when exposed to oxygen is an example of this sign of a chemical reaction.
  3. 5. These are always different from the reactants.
  4. 6. When atoms combine to produce a new substance.
  5. 9. The only electrons involved when atoms bond.
  6. 10. These reactions make the environment feel cold because heat is absorbed.
  7. 11. In these reactions heat is released.
  8. 13. Numbers use to balance a chemical equation.
Down
  1. 1. Bubbles signify this sign of a chemical reaction.
  2. 4. When only the form or appearance of a substance changes.
  3. 5. A solid that comes out of solution during a chemical reaction.
  4. 7. A change in temperature is an example of this sign of a chemical reaction.
  5. 8. In a chemcial reaction atoms are not created or destroyed but instead are_________.
  6. 12. The ingredients of a chemical reaction.