PS.Chm.5.1 – Vocabulary Crossword

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Across
  1. 2. A meeting between particles in a chemical reaction
  2. 4. A substance that speeds up a reaction without being used up
  3. 7. Explanation of how chemical reactions occur
  4. 8. Substances present at the start of the reaction
Down
  1. 1. Energy needed to start a reaction
  2. 3. The minimum energy needed for a reaction to occur
  3. 5. Collisions that result in a chemical reaction
  4. 6. The exposed part of a solid that affects the reaction rate
  5. 9. Measure of average kinetic energy of particles