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Explain why the rate of reaction increases when the temperature is raised, in terms of collision theory. At higher temperatures particles have more kinetic energy and collide more often...
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Your answer · Chemistry · CAIE
Explain why the rate of reaction increases when the temperature is raised...
4/6
Developing
Good on collision frequency — missing Ea threshold definition.
Marks Awarded
+ Frequency of collisions increases with temperature
+ More particles have kinetic energy ≥ Ea
+ Particles move faster, collide more often
+ More successful collisions per unit time
Marks Missed
− Must define activation energy explicitly
− Proportion exceeding Ea increases significantly
Model Answer At higher temperatures, particles possess greater kinetic energy. A greater proportion of particles exceed the activation energy (Ea — the minimum energy for a successful collision), so the frequency of successful collisions increases significantly...
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4 / 6
Developing — good on frequency, missing Ea threshold
+ Frequency of collisions increases with temperature
+ More particles have sufficient energy to react
− Must define activation energy explicitly
− Higher proportion of molecules exceed Ea at higher T
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elid · CAIE "At higher temperatures, a greater proportion of particles possess kinetic energy ≥ Ea, increasing the frequency of successful collisions."
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