3C - Physical chemistry (c) Reversible reactions and equilibria
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Can reversible reactions reach dynamic equilibrium in a sealed container?
Yes
What are the two characteristics of a reaction at dynamic equilibrium?
• The forward and backwards reactions occur at the same rate • The concentrations of reactants and products remain constant
Why does a catalyst not affect the position of equilibrium in a reverse reaction?
The catalyst would speed up both the forward and backwards reactions at the same rate, it would reach equilibrium faster, but the position of equilibrium would not change.
• What happens to the equilibrium when the temperature increases? • What happens to the equilibrium when the temperature decreases?
• Shifts in the endothermic direction • Shifts in the exothermic direction
• What happens to the equilibrium when the pressure increases? • What happens to the equilibrium when the pressure decreases?
• Shifts to fewest gas moles • Shifts to most gas moles
• What happens to the equilibrium when the concentration of reactant increases? • What happens to the equilibrium when the concentration of reactant decreases?
• Shifts to right (To balance extra reactant) • Shift to left (To balance more products than reactant)