The Rate And Extent Of Chemical Change Flashcards
What is the equation for the ‘mean rate of reaction’ ?
Quantity of reactant used/formed
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Time taken
What 5 potential factors affect the rate of chemical reaction ?
Concentration of reactants
Pressure of reacting gases
Surface area of solid reactants
Temperature
Presence of catalysts
What does the collision theory state ?
Chemical reactions can only occur when reacting particles collide with each other and with sufficient energy
What is the minimum amount of energy a particles must have to react called ?
The activation energy
What do catalysts do?
Change the rate of chemical reactions
How do you catalysts increase the rate of reaction?
They provide a different pathway for the reaction that has a lower activation energy
When is equilibrium reached?
When the forward and reverse reactions occur at exactly the same rate
If a system is that equilibrium and a change is made to any of the conditions what happens?
The system responds to counteract the change
What happens if the concentration of one of the reactants and products has changed?
The system is no longer at equilibrium
What happens if the concentration of reactant is increased?
More products will be formed until equilibrium is reached
What happens if the concentration of product is decreased?
More reactants will react until equilibrium is reached again
What happens if there is an increase in pressure at equilibrium?
The equilibrium position shifts towards the side of the smaller number of molecules
What happens if there is a decrease in pressure at equilibrium?
The equilibrium position shifts towards the side of the larger number of molecules
