7.2 Equilibrium Law & the Equilibrium Constant Flashcards
1
Q
At equilibrium…
A
Forward reaction=reverse reaction
2
Q
Homogenous Equilibrium
A
Chemical equilibrium systems in which all reactants and products are in the same state of matter
3
Q
Heterogenous Equilibrium
A
When reactants and products are in more than one state
4
Q
In heterogenous equilibrium what does the equilibrium position not depend on?
A
- The quantities of pure solids or liquids
- the concentrations of entities in these states do not change
5
Q
Why are solids and liquids not included in the equilibrium expression?
A
Since these concentrations cannot change
6
Q
Main conclusion #1
A
- The equilibrium expression for a reaction is the reciprocal of the reverse reaction
- Kbackward=1/Kforward
7
Q
Main conclusion #2
A
- When a chemical equation is multiplied by a factor n, the equilibrium expression for the new reaction is the original expression raised to the nth power
- K new=(K original)^n
8
Q
Main conclusion #3
A
K values are written without units
9
Q
When K<1 (small)…
A
- position of equilibrium shifts to the left
- Favours reactants
10
Q
When K=1…
A
- Reactants=Products
- System is at equilibrium
11
Q
When K>1 (large)…
A
- Position of equilibrium shifts to the right
- Favours products
12
Q
What does the time required to achieve equilibrium depend on?
A
- Reaction rate
- Determined by the size of the activation energy
13
Q
What is the size of K determined by?
A
- Thermodynamic factors
- Such as the difference in energy between products and reactants
