Chemical Crossword

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Across
  1. 2. color, density, and melting point are ________ properties
  2. 4. the formula for carbon dioxide
  3. 5. the study of matter and how it changes
  4. 6. lowers the activation energy of a chemical reaction
  5. 7. when compounds are broken down into simpler products
  6. 9. A reaction that absorbs energy is ______.
  7. 10. slows down a chemical reaction
  8. 12. the least amount of energy needed to start a chemical reaction
  9. 14. when at least one element takes the place of another in a chemical reaction
  10. 15. Heat, light, and electricity are examples of _______.
  11. 16. A reaction that releases energy is ______.
Down
  1. 1. when two or more elements combine to make a more complex substance
  2. 3. the amount of a substance in a given volume
  3. 8. flammability, reactivity, and acidity/basicity are _________ properties
  4. 11. anything that has mass and takes up space
  5. 13. A chemical ______ uses chemical formulas to summarize a reaction.