BRAINCAKEReaction Rates
Revision notes for Reaction Rates in Edexcel Chemistry (8CH0). Read the start of any lesson here, then sign in free for the whole lesson, the R.E.C.I.P.E. recall steps and the quiz.
- The Rate of ReactionThe rate of reaction is the change in the amount or concentration of a reactant or product per unit time. rate = change in concentration ÷ time…
- Collision TheoryCollision theory explains why reactions happen and what controls their rate.
- Activation EnergyThe activation energy, Ea, is the minimum energy that colliding particles must have for a reaction to occur.
- Steric HindranceCollision theory says that particles must collide with the correct orientation to react.
- Effect of ConcentrationIncreasing the concentration of a reactant in solution increases the rate of reaction.
- Effect of PressureFor reactions involving gases, increasing the pressure increases the rate of reaction.
- Effect of Surface AreaWhen one reactant is a solid, the reaction can only happen at its surface, because only the particles on the surface can collide with particles of…
- Maxwell-Boltzmann Distribution CurveThe molecules in a gas do not all have the same energy.
- Effect of TemperatureIncreasing the temperature increases the rate of reaction, often by a large amount.
- Collisions in SolutionCollision theory applies to reactions in solution just as it does to gases.
- Effect of CatalystsA catalyst is a substance that increases the rate of a reaction without being used up.
- Catalysts in IndustryMost industrial chemical processes use catalysts, because they bring large economic and environmental benefits.