chapter 5

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Across
  1. 3. increases reaction rate by lowering activation energy
  2. 4. solids that forms from liquids in chemical change
  3. 7. number in front of chemical formula in equation
  4. 10. amount of substance in given volume
  5. 14. system matter can enter or escape
  6. 15. two elements in different compounds trade places
  7. 17. of conservation of mass says matter is not created or destroyed
  8. 19. decreases the rate of chemical reaction
Down
  1. 1. substances that undergo chemical changes
  2. 2. compounds break down into simpler products
  3. 5. system matter does not enter or leave
  4. 6. equation shows chemical reaction using symbols
  5. 8. reaction reaction that absorbs energy
  6. 9. biological catalyst
  7. 11. reaction reaction that releases energy
  8. 12. two or more elements combine to form more complex compound
  9. 13. new substances formed in chemical change
  10. 16. energy minimum amount of energy needed to start reaction
  11. 18. change any change that alters form or appearance