Chemical Equilibria Flashcards
Increasing temp favours the exothermic reaction or the endothermic reaction ?
increasing the temperature will always favour the endothermic
decreasing temp favours the exothermic reaction or the endothermic reaction ?
favours the exothermic reaction.
what does +Q or -Q stand for
they are the same as using ΔH
+Q = endothermic reaction = +ΔH
-Q = exothermic reaction = -ΔH
what is the reaction quotient (Q)
mesaures the ratio of products to reactant at any point in the reaction.
using concentration or partial pressure
Q = [products] / [reactants]
(with stochiometry as powers).
can be calculaated wherever in the reaction, and can tell us which direction the reaction will shift to reach equilibrium.
equilibrium constant
K = [products] / [reactants] - these values are from the conc or pressure at equilibrium
again stochiometry used for orders.
K tells us the ratio or products to reactants when the system is at equilibrium.
what does Q<K tell us
when the conc of the products is lower than the reactants, compared to the equilibrium position.
- the reaction will shift in the forward reaction to produce more products. and reach equilibrium.
what does Q>K tell us
the conc of products is higher than the reactants, compared to the eqillibrium position.
- so the reaction shifts in the backwards direction to produce more reactants and reach equilibrium.
what factors affect the equilibrium constant K
temperature, concentration, pressure (volume), reaction nature - has tp be reversible.
watch allery chem for basic recap
yes madam
