1.5 Kinetics
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What must particles do in order to react
Collide with sufficient energy (activation energy) and the correct orientation
Do most collisions result in a reaction
No
Define activation energy
The minimum energy that particles must collide with for a reaction to occur
What is the effect of increasing temperature on RoR? Why?
Increasing temperature - increased RoR —> Much higher proportion of particles have energy greater than the activation energy —> Many more successful collisions per second —> increased rate
What is the effect of increasing pressure / concentration on RoR? Why?
Increased concentration / pressure —> increased RoR —> there are more particles in a given volume —> more frequent successful collisions —> increased rate
What is a catalyst
A substance which increases the RoR but is not used up in the reaction
How do catalysts work and how do they increase RoR
Provide an alternative pathway for the reaction with a lower activation energy Lowers activation energy, so more particles have energy > activation energy, so more frequent successful collisions, so increased reaction rate