GCSE Chemistry – Factors Affecting Rate of Reaction & Collision Theory (2026/27 exams)

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*** WHAT’S COVERED ***
1. Collision Theory
* An explanation that for a reaction to occur, particles must collide with sufficient energy, known as the activation energy.
* The two factors that determine reaction rate: the energy of particle collisions and the frequency of collisions.
2. The Effect of Temperature on Reaction Rate
* How increasing temperature leads to particles having more kinetic energy.
* This results in more frequent and more energetic collisions, increasing the rate of successful collisions.
3. The Effect of Concentration and Pressure on Reaction Rate
* How increasing concentration (in solutions) or pressure (in gases) means more particles are present in a given volume.
* This increases the frequency of collisions, which in turn increases the reaction rate.
4. The Effect of Surface Area on Reaction Rate
* How increasing the surface area to volume ratio (e.g., a powder vs. a solid block) increases the reaction rate.
* A larger surface area exposes more reactant particles, leading to more frequent collisions.
5. The Effect of Catalysts on Reaction Rate
* A definition of catalysts as substances that speed up a reaction without being consumed.
* An explanation of how catalysts work by providing an alternative reaction pathway with a lower activation energy.
* Visualisation of a catalyst’s effect using reaction profile diagrams.

*** CHAPTERS ***
0:00 Introduction
0:23 Collision Theory & Activation Energy
2:00 Factor 1: Temperature
2:29 Factor 2: Concentration & Pressure
3:01 Factor 3: Surface Area
3:45 Factor 4: Catalysts
4:04 How Catalysts Work (Reaction Profiles)

*** PLAYLISTS ***

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