10289756
Description
Flashcards by Chloe Drewery, updated more than 1 year ago
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Created by Chloe Drewery
over 8 years ago
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| Question | Answer |
| Kc/ Equilibrium constant | A measure of the position of the equilibrium; the magnitude of an equilibrium constant indicates whether there are more reactants or more products an equilibrium system. |
| Homogeneous Equilibrium | An equilibrium in which all the species are making up the reactants and products have the same physical state. |
| Heterogeneous Equilibrium | An equilibrium in which the species making up the reactants and products have different physical states. |
| Equilibrium | The rate of the forwards reaction is equal to the reverse. |
| Kp | Used for gaseous equilibria. It doesn't use concentrations, instead requires partial pressures. |
| Partial Pressure | It is the contribution each gas makes towards the total pressure. = mole fraction x total pressure. |
| What doesn't affect K? | Concentration, pressure and catalysts don't affect K as they are quantities. |
| What affects K? | Temperature does as its a condition. |
| Exothermic (increasing temperature) | Favours endothermic direction Shifts to the left Kp decreases |
| Exothermic (decreasing temperature) | Favours exothermic direction Shifts to the right Kp increases |
| Endothermic (increasing temperature) | Favours the endothermic direction Shifts to the right Kp increases |
| Endothermic (decreasing temperature) | Favours the exothermic direction Shifts to the left Kp decreases |
| Changing [B] / [A] | Disables the equilibrium because K is a constant value and the expression is now higher/lower than k. [B] or [A] must increase or decrease until the expression is equal to k. When they are equal to k, equilibrium is restored. |
| Temperature (K) | Quantities [B] / [A] don't change. Equilibrium is affected by temperature. K must change to a new value. This will disable the equilibrium as the values don't match k. So the quantities must adjust. |
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