Rates of reaction

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Across
  1. 3. The colour of sulfur powder
  2. 4. The speed of a reaction
  3. 5. Surface area increases when we make lumps of solid ....
  4. 8. The energy needed by particles in order for a reaction to occur
  5. 9. This is the type of variable that we keep the same
  6. 12. The number of particles in a particular volume of a gas
  7. 14. This is a very slow reaction that involves the corrosion of iron
  8. 15. The substances that are made in a reaction
  9. 17. The number of particles in a particular volume of solution
Down
  1. 1. Increasing this gives the reacting particles more energy
  2. 2. Particles do this when they bump into each other
  3. 6. This is a substance that can be added to a reaction to speed it up. It remains unchanged in the reaction.
  4. 7. This is the variable that we measure
  5. 10. This is the variable that we change
  6. 11. The volume of a gas can be measured using a gas ....
  7. 13. This is what we call a collision in which a chemical reaction takes place
  8. 16. The starting materials in a reaction