Y8 Chemistry - Describing Reactions revision

123456789
Across
  1. 2. A reaction which releases heat to the surroundings (gets hotter).
  2. 3. A substance, not used up in a reaction, which lowers the activation energy of a reaction.
  3. 6. A reaction which absorbs heat from the surroundings (gets cooler).
  4. 8. The average. When you add the data together then divide by the number of data points.
  5. 9. The minimum energy needed to make a reaction happen.
Down
  1. 1. A measurement device used to measure temperature.
  2. 3. The number of particles in a volume. Increasing it will increase the rate of reaction.
  3. 4. If you decrease this, the particles move slower and the rate of reaction slows down.
  4. 5. An expensive metal used in catalytic converters in cars.
  5. 7. A catalytic _______ is used in cars to change nasty exhaust fumes into less nasty gases.