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