chemical equilibrium Ch 14 Flashcards
why does raising the temperature or increasing the pressure of a gas phase help increase the rate of the reaction
increased temperature or pressure for a gas-phase reaction increases the number of collisions.
equilibrium is achieved when
the rates of a reversible reaction in the forward direction and the reverse direction become equal
base…..electrons
donates
acid…..electrons
accepts
lower pka acidity?
higher acidity
when products are favored over reactants
K>1
when reactants are favored over products
K<1
the K value of a reaction running in reverse is
the reciprocal of the K of the forward reaction
reaction Q
value based on the concentration and partial pressures of reactants and products present at any time during the reaction
% dissociated
amt dissociated/ original amount
is K temp dependent?
true
smaller ka…..
weaker acid and less products
less small ka
weak acid and more products
To break the H-F…H-F intermolecular bond, energy must be
added to the dimer
in order for the H-F dimer to be formed from two individual H-F molecules, which of the following is needed?
another molecular atom is needed to carry away the energy released when the intermolecular bond is formed.
when a chemical equilibrium is reached, the concentrations of the reactants and products……..,and the reaction……
are not changing on the macroscopic level…….. is still happening in both directions
you can predict that a solution containing .0083M acetic acid will be…….1.5% dissociated.
more than
the equilibrium constant Keq will……hav units
is in M but will never have units
Q<K
more products are formed
Q=K
no change in concentration in reactants and products
Q>K
more products are formed
homogenous equilibria
equilibria in which products and reactants are all in the same phase
heterogeneous equilibria
equilibria in which products and reactants are in different phases
