chemistry

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Across
  1. 4. speeds up chemical reaction
  2. 5. Group 0 elements
  3. 7. The speed at which the amount of reactants decreases or the amount of products increases
  4. 8. is a metal
  5. 9. when particles collide
Down
  1. 1. Biological catalysts, usually consisting of proteins
  2. 2. group 7 elements
  3. 3. Force exerted over an area.
  4. 4. 7 electrons in outer shell
  5. 6. orange brown colour