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6. What is the effect of temperature increase on reaction rate?

  • Increases, due to more frequent collisions and greater proportion of successful collisions
  • Decreases, due to less particle collisions
  • Increases due to all of the particle collisions becoming successful

7. Using two given equations, how can you spot a catalyst?

  • Catalyst present in reactants of first reaction and products in second reaction. Intermediate is also formed.
  • 2 new compounds form, alongside an intermediate
  • The reaction produces water or carbon dioxide

8. A lower activation energy means the reaction rate will be?

  • High
  • Low
  • The same as normal

9. What happens to a Maxwell-Boltzman curve if temperature is increased?

  • Curve moves down & to the right
  • Curves moves down & to the left
  • Curve moves up & to the right

10. What factors increase rate of reaction by causing more frequent collisions per unit of time?

  • surface area only
  • concentration,pressure and surface area
  • time, concentration and surface area

11. What do Maxwell-Boltzman curves show?

  • The amount of energy transferred between particles in a reaction
  • Number of molecules with a particular energy at a given tempurature
  • Number of bonds being broken in a reaction

12. What is a 'successful' particle collision?

  • collision that produces more product
  • collision that exceeds the activation energy
  • collision that doesnt affect reaction rate

13. What factor affects the proportion of successful particle collisions in a reaction?

  • Tempurature
  • Surface area
  • Concentration

14. How do catalysts work?

  • By providing an alternative reaction path by lowering the activation energy
  • By providing extra oxygen for the reaction
  • By starting and stopping the reaction often

15. What units are used for reaction rate from a graph?

  • moldm-3s-1
  • moldm2
  • mol

16. how can you work out reaction rate from a graph?

  • change in y / change in x
  • change in x / change in y
  • change in y x change in x

17. How can reaction rate be calculated with a changing concentration?

  • change in concentration/change in time
  • change in time/change in concentration
  • change in concentration x change in time

18. How can percentage error be reduced?

  • Use equipment with lower error & use larger masses
  • Use smaller masses & equipment with lower error
  • Only larger masses can reduce percentage error

19. If reactants have high bond enthalpies, what does this mean for the activation energy?

  • It won't change
  • It will be high
  • It will be low

20. In catalyzed reactions, the 'intermediate' is...

  • A chemical formed during a reaction which is not present by the end, shows the alternate reaction path
  • A chemical present in all compounds involved in the reaction
  • A chemical formed during a reaction which is still present by the end of the reaction, it is the catalyst.