Chemical Reactions

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Across
  1. 2. Chemical reactions can _____,
  2. 3. _____ reactions occur automatically, without any catalysts or assistance
  3. 7. _____are simple alterations in the appearance or feel of matter that do not alter its fundamental composition
  4. 10. Chemical changes that give off heat are _____
  5. 11. _____ compounds and molecules
  6. 12. Scientists often wear protective gear because some chemical reactions can be _____
Down
  1. 1. Two kinds of evidence that a chemical reaction has taken place are a change in _____
  2. 4. or _____
  3. 5. _____, or
  4. 6. Chemical changes that absorb heat are _____
  5. 8. The processes of creating and/or destroying chemical bonds change the makeup and properties of substances, and are called _____
  6. 9. When properly harnessed, many chemical reactions are _____