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Chemistry - Rates of Reaction (Variables that affect the rate of reaction,…
Chemistry - Rates of Reaction
Variables that affect the rate of reaction
Surface Area
Concentration
Catalyst
Pressure
Temperature
Light
Collision Theory
When particles collide they must collide with enough energy this amount of energy is known as the activation energy.
If they don't have enough energy then they will just bounce off each other and no reaction will occur.
The more collision = The greater rate of reaction
In order for a chemical reaction to occur the reactant must collide with each other.
Surface Area
This means that there is a greater surface available for collisions to occur.
Decreasing the size of particles increases their surface area.
Concentration
This means a higher rate of reaction.
The higher concentration = the greater number of collisions per minute.
The concentration indicates how many particles there are in every cm3 of liquid.
Pressure of Gas
This means more collisions per minute = a higher rate of reaction.
This pretty much means there is more particles per cm3.
A high pressure of a gas is the equivalent of a high concentration of a solution
Temperature
This means more collisions = greater rate of reaction
At a greater temperature more particles will possess the activation energy.
This means more successful collisions meaning a higher rate of reaction.
Increasing temperature of a liquid increases the connective energy of the particle.
Catalysts
Catalysts work by providing an alternative pathways with lower activation energy.
Catalysts: Are substances that increase the rate of reaction, but don't get used up.
