Topic 10-Equilibrium I Flashcards
What is a homogeneous system?
A system in which everything is in the same physical state.
What is a heterogenous system?
Where not everything is in the same physical state. (therefore leave out solids and liquids)
If value of Kc is less than 1 what does this mean?
Position of equilibrium lies to the left
If value of Kc is more than 1 what does this mean?
Position of equilibrium lies to the right
Equation for mole fraction?
no.of moles in gas /total no.of moles of all gases
Equation for partial pressure?
total pressure * mole fraction
Explain “dynamic equilibrium” (2)
Forward reaction= same rate as backward reaction
The concentrations of reactants and products stay constant (closed system)
Catalysts …. …. the equilibrium constant or concentrations.
Catalysts don’t affect the equilibrium constant or concentrations of products or reactants.
Catalysts speed up the … of …. ……. being reached
Catalysts speed up the rate of Dynamic Equilibrium being reached.
If there’s a change in ……., ……… or …………. the equilibrium will …… to ……… the change.
If there’s a change in pressure, concentration or temperature the equilibrium will move to counteract that change.
What condition effects the values of Kc?
Temperature
What is Le Chatelier’s Principle?
When a change occurs in a system the equilibrium position will move to help counteract the change
Increasing temperature favours the ……. reaction
endothermic
decreasing temperature favours the ……. reaction
exothermic
Increasing pressure favours the side of the reaction with ….. ……
fewer moles
decreasing pressure favours the side of the reaction with …… …..
more moles
If temperature is decreased the equilibrium will shift to oppose this and move in the …….. direction to try to increase the temperature by giving out heat.
EXOTHERMIC
If temperature is increased the equilibrium will shift to oppose this and move in the ………. direction to try to reduce the temperature by absorbing heat
ENDOTHERMIC
The larger the Kc the …….. the amount of products. If Kc is small we say the equilibrium favours the ……..
greater the products
if small eq favours reactants
What happens if you increase the concentration of a reactant?
The equilibrium tries to remove extra rectant by producing more product and shifts RIGHT
What happens if you decrease the concentration of a product?
Equilibrium tries to remove extra product by producing more reactant (reverse reaction faster) so eq shifts to the left
What type of system is Kc relevant for?
Homogenous systems in equilibrium
