rate of reaction

12345678
Across
  1. 4. smallest particle in a chemical element
  2. 5. A higher _________ of a reactant usually increases the reaction rate
  3. 7. It is produced in the liver, and is found in nearly all animal cells,especially in blood.
  4. 8. Many chemical reactions occur in living things.These reactions need biological catalysts called
Down
  1. 1. affects rate of reaction, especially in gases
  2. 2. A substance participating in a chemical reaction
  3. 3. when risen molecules bounce around more
  4. 5. used in industry to control the speed of reactions and to reduce the costs of producing chemicals
  5. 6. an explosion has a ____ reaction rate