Temperature and Pressure effects / Le Châtelier’s Principle

Question 1

Experimentally it has been found that the
composition of equilibrium…

Answer 1

mixtures obtained from reversible reactions may be affected by:

• Temperature
• Addition or removal of reactants or products, with consequent changes in concentrations or partial
  pressures (ex. CO2)
• Changes in total pressure (deep oceans)

Question 2

Le Châtelier’s Principle states

Answer 2

that if a system at equilibrium is disturbed, the position of equilibrium will shift in such a way as to counteract the
disturbance.

Question 3

Response of Equilibria to Conditions:

Answer 3

LeChatelier’s
Principle.

• A system at
  equilibrium, when subjected to a
  disturbance,
  responds in a
  way that tends to minimize the
  effect of the
  disturbance.

Question 4

Change in Reactant or Product Concentrations: (2)

Answer 4

• Adding a reactant or product shifts the position of
  equilibrium away from the increase.
• Removing a reactant or product shifts the equilibrium towards the decrease.

Question 5

To optimize the amount of product at equilibrium…

Answer 5

we
need to flood the reaction vessel with reactant and
continuously remove product (by Le Châtelier’s
Principle).

• Metabolic Pathways in the Cell do this ALL the time.