Practice: Which of the following does not represent a heterogenous equilibrium?
I) CH4(g) + 2 O2(g) ⇌ CO2(g) + 2 H2O(g)
II) CO2(g) + C(s) ⇌ 2 CO(g)
III) 2 H2O(l) ⇌ 2 H2(g) + O2(g)
IV) CH3COOH(aq) + H2O(l) ⇌ CH3COO–(aq) + H3O+(aq)
Most chemical reactions never go to completion, instead reach a chemical equilibrium.
Chemical Equilibrium
Concept #1: Intro to Chemical Equilibrium Concept 1
A reaction reaches equilibrium once the rate of the forward reaction equals the rate of the reverse reaction. Once at equilibrium there is no net change in the concentration of reactants or products.
Example #1: Describe what happens when reaction reaches chemical equilibrium.
a) reaction stops
b) reactants form products as fast as products form reactants
c) the collision frequencies of products and reactants are identical
d) rates of forward and reverse reactions are equal to zero
