Reaction Rates-- Chapter 4

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Across
  1. 1. a(an) __ system is one where to matter is allowed to leave or enter.
  2. 3. the number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant & product are involved in a reaction
  3. 5. ____ energy is the minimum about of energy needed to start a chemical reaction
  4. 7. a chemical _____ is a short easy way to show a chemical reaction using symbols
  5. 10. a solid that forms from a solution during a chemical reaction
  6. 11. a chemical reaction that breaks down compounds into simpler products
  7. 13. an ______ reaction is a reaction that absorbs energy
  8. 14. any change in matter that produces a new substance
  9. 15. a chemical reaction in which two or more simple substances combine to form a new more complex substance
  10. 16. a reaction in which one element replaces another in a compound or when two elements in different compounds trade places
Down
  1. 1. a material that increases the rate of a reaction by lowering the activation energy
  2. 2. a material that decreases the rate of reaction
  3. 4. a substance formed as a result of a chemical reaction
  4. 6. a substance that enters into a chemical reaction
  5. 8. a(an)___ system is one where matter can enter from or escape to the surroundings
  6. 9. an ____ reaction is a reaction that releases energy (usually in the form of heat)
  7. 10. any change that alters form or appearance of a substance
  8. 12. the amount of one material in a certain volume of another material
  9. 17. a type of protein that speeds up a chemical reaction in a living thing