Chapter 4 Crossword

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Across
  1. 2. Solid formed from liquid reactants during a chemical reaction
  2. 3. a number placed in front of a chemical formula in an equation
  3. 5. substance that undergoes a chemical change
  4. 6. compounds break down into simpler products
  5. 8. the new substance formed from a chemical change
  6. 10. matter doesn’t enter or leave
  7. 12. matter can enter or escape the surroundings
  8. 13. 1 element replaces another element in a compound
  9. 16. reaction in which energy is absorbed
  10. 17. way to show a chemical reaction, using symbols instead of words
  11. 18. any change that alters the form or appearance of a substance but does not create a new substance
  12. 19. minimum amount of energy need to start a chemical reaction
  13. 20. increases the reaction rate by lowering the activation energy needed
Down
  1. 1. a change in matter that produces one or more substances
  2. 4. material used to decrease the rate of a chemical reaction
  3. 7. reaction that releases energy in the form of heat
  4. 9. during a chemical reaction, matter is neither created or destroyed
  5. 11. 2 or more elements or compounds combine to make a more complex substance
  6. 14. help reactions occur at body temperature
  7. 15. the amount of substance in a given volume