chemical equilibrium Flashcards
what reactions are we looking at?
- reversible reactions
- never fully complete because of dynamic nature
- called equilibrium chemical reactions
what do equilibrium chemical reactions entail?
- two reactions (forward and back) occurring at the same time
what is equilibrium?
the rate of the reactions thus if a reaction system is at equilibrium, the rate of both reactions is equal
what is the equilibrium constant and what is its unit?
Kc
M
what is Kc?
a study of yield
what is the equation of the equilibrium constant?
[product]/[reactant]
coefficients are represented as powers
what does a large and small Kc represent?
- large: large [products]
- low: low [products]
what value must Kc be to be at =m?
between 10^-4 and 10^4
Kc bigger than 10^4?
favours a forward reaction, large yield
Kc smaller than 10^-4
favours a backwards reaction, low yield
how do you find M?
use index laws within the fraction to solve
how do you calculate concentration?
c = n/V
how do you solve the concentration of a chemical;?
sub and rearrange
what is the RICE method?
- write out ratios of stoich
- write out initial mol from question (some might be 0 if not specified)
- use on to see how much change there is in mol at =m
- use that mole amount and divide accordingly to match stocih and use that to subtract from initial amounts
- calculate cocentration from =m mol
- use that to calculate Kc
double stoichiometry?
square Kc
halve stoichiometry?
square root Kc
reverse reaction?
inverse Kc