Key words for reactions and practical work

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Across
  1. 3. the number of particles per unit volume
  2. 5. the number of collisions taking place per unit time
  3. 6. a substance that speeds up a chemical reaction but remains chemically unchanged itself at the end of the reaction
  4. 8. has a value represented by words, shown with a line graph
  5. 9. the variable that you change or measure
  6. 13. a collision between particles that leads to a reaction
  7. 15. a measurement close to the true value
  8. 17. an explanation of chemical reactions in terms of reacting particles colliding with sufficient energy for a reaction to take place
  9. 18. the amount of product formed, or reactant used up, over time
  10. 19. a variable that must not change during an experiment, otherwise, the results are invalid
  11. 20. a poor measurement, usually seen as an anomalous result
Down
  1. 1. the ‘exterior’ of a solid that can react with other substances
  2. 2. the minimum energy needed for a reaction to take place. Often shortened to Ea
  3. 4. a collision between particles that does not lead to a reaction
  4. 7. has a value represented by numbers, shown with a bar chart
  5. 10. the variable that you measure
  6. 11. a result that is clearly different from the expected pattern
  7. 12. measurements in which there is very little spread about the mean value
  8. 14. a problem with the apparatus as the results are precise, but not accurate
  9. 16. 1/s
  10. 18. if another person repeats your experiment in the same way, or if you repeat using different equipment or techniques and the same results are obtained
  11. 20. if you repeat your experiment using the same method and equipment and obtain the same results