Speeding up or slowing down reactions

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Across
  1. 3. opposite of hot
  2. 5. the theory stating that particles involved in a chemical reaction must collide in order to react
  3. 7. a catalyst in living organisms
  4. 10. smaller reactant pieces have a larger...
Down
  1. 1. the number of active molecules in a set volume of solution
  2. 2. mild temperature typically of water
  3. 4. not cold
  4. 6. the measure of the amount of heat
  5. 8. increases reaction rate by phycially making the reactants bump together more often
  6. 9. increases the reaction rate without itself undergoing chemical change