Chapter 4 - Chemical Reactions

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Across
  1. 2. a law that states nothing is created or destroyed in a chemical reaction
  2. 3. system in which matter cannot enter or leave
  3. 6. the amount of a substance in a given volume
  4. 7. when one element or compound replaces another
  5. 10. energy the minimum amount of energy needed to start a chemical reaction
  6. 13. absorb heat energy
  7. 16. a way to show a chemical reaction using symbols instead of words
  8. 18. a change in matter that produces one or more new substances
  9. 19. increases reaction rate by lowering activation energy needed
  10. 20. system in which matter can enter or escape into surroundings
Down
  1. 1. the number placed in front of a chemical formula in an equation
  2. 4. compounds break down into simpler substance
  3. 5. the new substances that are formed in a chemical reaction
  4. 8. a biological catalyst
  5. 9. any change that alters the form or appearance of a substance but does not change it into another substance
  6. 11. two or more elements or compounds combine to make a more complex substance
  7. 12. release heat energy
  8. 14. substances that undergo a chemical change
  9. 15. a solid that forms from liquids
  10. 17. a material used to decrease the reate of a chemical reaction