Rates of reaction

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Across
  1. 2. What is the attachment of molecules to a solid surface called?
  2. 3. Rate of molecular collisions in chemical reactions.
  3. 6. A substance added to a chemical reaction that increases rate of reaction.
  4. 7. What takes place when particles collide with enough energy to initiate a reaction?
  5. 8. What are the biological catalysts that consist of protein molecules?
Down
  1. 1. What is the manufacturing of sulfuric acid called when using the raw materials: sulfur and air?
  2. 4. What is the speed at which a chemical reaction takes place?
  3. 5. What is the manufacturing of ammonia called when reacting nitrogen with hydrogen in the presence of an iron catalyst?