Unit One, Chapter Nine - Chemical Equilibrium and Factors Affecting Equilibrium Flashcards
A reaction is in equilibrium when…
the concentrations of reactants and products are constant
for the reversible reaction reactants<>products, K is given by…
K = products/reactants
if the reaction is written as aA + bB —> cC + dD, then K is given by…
K = [C]^c[D]^d / [A]^a[B]^b
K < 1 indicates…
equilibrium lies more to the left side (reactants side)
K = 1 (approx) indicates…
neither reactants nor products are favoured
K > 1 indicates…
equilibrium lies more to the right side (products side)
K is dependant on…
reaction temperature
K is independent of…
concentration and/or pressure
For endothermic reactions, a rise in temperature…
causes an increase in K and and increase in yield of the product
For exothermic reactions, a rise in temperature…
causes a decrease in K and a decrease in yield of the product
The present of a catalyst…
does not affect the value of the equilibrium constant (K)
Equilibrium constant symbol
K
What is a closed system?
When the chemicals are “trapped”, and nothing is added or removed, but heat is allowed to be transferred to or from the surroundings
