1.6 - Chemical Equilibrium Flashcards
Why can equilibrium only be reached in a closed container?
Some of the products and the reactants might escape.
What is dynamic equilibrium?
It is when the forward and the backward rate of reaction is the same and it remains at a constant rate.
How do you know if something is at equilibrium?
- The rates of the forward + reverse reactions are the
same. - The net concentrations of the components of the
reaction mixture remain constant.
State the Le Chatelier’s Principle.
If a factor affecting the position of an equilibrium is altered, the position of the equilibrium shifts to oppose the effect of the change.
What does an increase + decrease in pressure do?
Increase: It causes the equilibrium position to shift towards the side with the smaller number of molecules.
Decrease: It causes the equilibrium position to shift towards the side with the larger number of molecules.
What does a catalyst do in a reversible reaction?
It has no effect on the position of the equilibrium, it only speeds up the rate of reaction.
What is the symbol for exothermic?
-ΔH
What is the symbol for endothermic?
+ΔH
What will happen to the reaction if we increase or decrease its temperature?
Increase: Equilibrium is going to go towards endothermic.
Decrease: Equilibrium is going to go towards exothermic.
What condition from the options below affects the value of Kc?
1. Concentration
2. Catalyst
3. Pressure
4. Temperature
Temperature
What type of system is Kc relevant for?
Homogeneous systems in equilibrium
What does Kc being greaster or lesser than 1suggest for the position of equilibrium?
Greater than 1 = over to the right
Less than 1 = over to the left
What effect does decreasing the temperature in an endothermic reaction have on Kc?
Kc decreases.
What effect does increasing the temperature in an endothermic reaction have on Kc?
Kc decreases.
What effect does decreasing the temperature in an exothermic reaction have on Kc?
Kc increases.
