What categories are the rate of chemical ractions dependant on?
The frequency of collisions - how often particles collide with another
The energy transfered in a collision - particles will only react when there is enough energy to kick start the reaction . This is known as activation energy which is the minimum energy required to start a reaction
Why is energy needed in a chemical reaction?
To break down the bonds in the reactants
What are the factors affecting rate of reaction?
Temperature
Concentration and pressure
Surface area to volume ratio
Describe the effect of temperature on rate of reaction?
Increase temperature--> more kinetic energy-->move around faster-->more frequent collisions
Increase tmperature-->increase energy transfer in collisions-->more likely to satisfy activation energy-->reaction taking place
Describe the effect of Concentration and Pressure on rate of reaction?
Higher concentration/pressure-->particles are closer together-->more frequent collisions-->increase rate of reaction
Describe the effect of surface area to volume ratio on rate of reaction?
Reactant are smaller pieces-->greater surface area on the reactants for particles to collide upon-->more frequent collisions-->increase rate of reaction
