Describe the factors that affect Kc and how Kc can be increased (3)
Kc is not changed by concentration, pressure, or the use of catalysts - it is only affected by temperature. If for example, we have a reaction in which the forward reaction is exothermic: -if the temperature is increased, the endothermic (reverse) reaction will increase in rate, increasing the yield of reactants. As there are more reactants and less products, Kc will decrease. -if temperature is decreased, the rate of the exothermic reaction increases, increasing the yield of the products and decreasing that or the reactants. Kc will increase.
Kc is not changed by concentration, pressure, or the use of catalysts - it is only affected by temperature. If for example, we have a reaction in which the forward reaction is exothermic: -if the temperature is increased, the endothermic (reverse) reaction will increase in rate, increasing the yield of reactants. As there are more reactants and less products, Kc will decrease. -if temperature is decreased, the rate of the exothermic reaction increases, increasing the yield of the products and decreasing that or the reactants. Kc will increase.
What can increase the entropy of a system?
excellent, nothing to add again
Entropy could be increased by increasing more gaseous molecules on RHS of equation than LHS,
Kc is the equilibrium constant, so will give an idea of where the position of equilibrium of a system lies (but not how fast the reaction is going). High value of Kc = equilibrium to the right. Ka is the acid dissociation constant, and will indicate the extent of dissociation for an acid. High Ka value = strong acid.
Kc is the equilibrium constant, so will give an idea of where the position of equilibrium of a system lies (but not how fast the reaction is going). High value of Kc = equilibrium to the right. Ka is the acid dissociation constant, and will indicate the extent of dissociation for an acid. High Ka value = strong acid.
Please describe some limitations using hydrogen in a fuel cell
1) fuel cell uses toxic chemicals in their productions 2) fuel cells have limited life time and requires regular replacement and disposal following high production costs 3) Current adsorbers and absorbers have a limited life time 4) the feasbility of storing a pressurised liquid 5) the storage and trasnport of hydrogen is expensive
1) fuel cell uses toxic chemicals in their productions 2) fuel cells have limited life time and requires regular replacement and disposal following high production costs 3) Current adsorbers and absorbers have a limited life time 4) the feasbility of storing a pressurised liquid 5) the storage and trasnport of hydrogen is expensive