Collision theory
I can explain why increasing pressure, surface area or concentration increases the frequency of collisions between particles and therefore the rate of reaction.
Collision theory
I can explain why increasing pressure, surface area or concentration increases the frequency of collisions between particles and therefore the rate of reaction.
Lesson details
Key learning points
- Particles of reactants in a chemical reaction can react together if they collide with sufficient energy.
- Increasing surface area of a solid lets more reacting particles in a solution collide with its particles each second.
- Increasing concentration of a reacting solution introduces more reactant particles, so they collide more frequently.
- Increasing temperature of reactants increases the speed of particles, so they collide more frequently.
- Increasing pressure of reacting gases pushes reactant particles closer together, so they collide more frequently.
Common misconception
That every collision between reactant particles results in a chemical reaction.
The slide deck addresses that not every collision between reactant particles results in a chemical reaction. The particles must collide with the activation energy in order for the collision to be successful and a new product be formed.
Keywords
Collision theory - The collision theory is that particles must collide, and with sufficient energy, in order to react.
Activation energy - The minimum energy that the particles must have in order to react is known as the activation energy.
Rate of reaction - Rate of reaction is the speed with which a chemical reaction takes place, measured by the amount of a reactant used or amount of product formed in a given time.
Equipment
None required.
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Video
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Starter quiz
6 Questions
particles must collide, and with sufficient energy, in order to react
the minimum energy that the particles must have in order to react
the amount of chemical dissolved in a certain volume of solution
is the total area of every outer surface of an object