Science

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Across
  1. 4. the thermal (heat) content of a system
  2. 7. a theory that states that a chemical reaction takes place when particles of the reactants collide with sufficient energy to intimate the reaction.
  3. 8. a change in which a new substance is formed
  4. 10. a chemical reaction in which a substance reacts with oxygen; the reaction is exothermic
Down
  1. 1. a substance that increases the rate of a chemical reaction but itself remains unchanged
  2. 2. a measure of how fast a reaction takes place
  3. 3. the heat change during the course of a reaction.
  4. 5. the minimum energy required to start a chemical reaction
  5. 6. a reaction involving both reduction and oxidation
  6. 9. the attachment of molecules to a solid surface