Chemistry Year 12
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16 Terms
Open System
Exchange energy and matter with the surroundings.
Closed System
Exchange only energy with the surroundings.
Reversible Reaction
A reaction where the products, once formed, can react together to re-form the reactants.
Static Equilibrium
Where a position of balance has been achieved but no processes are happening.
Dynamic Equilibrium
Both reactants and products are present, macroscopic properties remain constant, microscopic processes continue at equal rates.
Dynamic Equilibrium occurs only in a…
Closed System
Le Chatelier’s Principle
If a stress/disturbance is applied to a system at equilibrium, the system will act to oppose the stress and establish equilibrium.
Homogenous System
Reactants and products are in the same phase.
Heterogenous System
Reactants and products are in different phases.
If Kc > 10⁴
Reaction has gone to completion
If Kc < 10⁻⁴
Reaction hardly takes place
In an exothermic reaction, an increase in temperature will…
Decrease the equilibrium constant
In an exothermic reaction, a decrease in temperature will…
Increase the equilibrium constant
In an endothermic reaction, an increase in temperature will…
Increase the equilibrium constant
In an endothermic reaction, a decrease in temperature will…
Decrease the equilibrium constant
Buffer
A solution that resists changes in pH when small amounts of acid or base are added.
Note 
Flashcards (78)