What principle determines the direction of an equilibrium shift after a concentration change?
The equilibrium shifts in the direction that opposes the change.
AQA GCSE Combined Science: Trilogy (8464) — Chemistry — Higher · 5.6.2.5
Revise AQA GCSE Combined Science: Trilogy (8464) — Chemistry — Higher specification point 5.6.2.5, The effect of changing concentration (HT only), with free active-recall flashcards. Flip through the set or review every question and answer below.
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What principle determines the direction of an equilibrium shift after a concentration change?
The equilibrium shifts in the direction that opposes the change.
How does equilibrium shift when a reactant’s concentration is increased?
Toward products.
How does equilibrium shift when a reactant’s concentration is decreased?
Toward reactants.
How does equilibrium shift when a product’s concentration is increased?
Toward reactants.
How does equilibrium shift when a product’s concentration is decreased?
Toward products.
What happens to reaction rates and concentrations at equilibrium in a reversible reaction?
The forward and reverse reactions continue at equal rates, so reactant and product concentrations remain constant.
How does an equilibrium system respond to a change in concentration?
It shifts in the direction that tends to reduce the change, until a new equilibrium is reached with a new set of concentrations.
How does adding a reactant affect the position of equilibrium?
Equilibrium shifts forward, forming more products.
How does removing a product affect the position of equilibrium?
Equilibrium shifts forward, replacing some of the removed product.
How does removing a reactant affect the position of equilibrium?
Equilibrium shifts in the reverse direction.
How does adding a product affect the position of equilibrium?
Equilibrium shifts in the reverse direction.