Rates of reaction

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Across
  1. 4. When nothing can enter or leave a a reaction is taking place
  2. 6. A substance which speeds up a reaction without being used up
  3. 10. A salt which has no water trapped in it
  4. 11. A reaction which takes in heat energy from the surroundings
  5. 15. A straight line drawn on the curve of a graph
  6. 17. When the rate of the forward and reverse reactions are equal
  7. 18. Describes the number of particles per unit volume
  8. 19. A reaction which can go both forwards and backwards
  9. 20. How much space something occupies
  10. 21. A reaction which gives out heat energy to the surroundings
  11. 23. Minimum energy needed to start a reaction
Down
  1. 1. Energy which particles have by moving
  2. 2. Indicates how steep a straight line on a graph or tangent is
  3. 3. A metal from the centre of the Periodic Table, often used as catalysts
  4. 5. The amount of exposed surface on a solid
  5. 7. The number of collisions per unit time
  6. 8. States what particles need to react with one another
  7. 9. An insoluble solid formed when several solutions react
  8. 12. A measure of how much heat energy something has
  9. 13. A force exerted by gases when the collide with a container
  10. 14. The substances produced in a chemical reaction
  11. 16. A measure of the amount of substance being used
  12. 21. A biological catalyst
  13. 22. The substances that react together in a chemical reaction