The study of the Rates of Chemical Reactions:
how fast do chemical reactions proceed to form products
The study of Reaction Mechanisms:
the steps involved in the change from reactants
Some of the most important reaction in chemistry are oxidation-reduction (redox) reactions.
In these reactions, electrons transfer from one reactant to the other. The rusting of iron,
bleaching of hai
React with bases to
form salt and water
React with a
1. For each reaction below, identify the Brnsted-Lowry acid and base and their conjugates:
NH4+ (aq) + CN (aq)
HCN (aq) + NH3 (aq)
(CH3)3NH+ (aq) + OH (aq)
(CH3)3N (aq) + H2O (l)
1. A buffer is prepared by adding 20.0 g of acetic acid (HC2H3O2) and 20.0 g of sodium
acetate (NaC2H3O2) in enough water to prepare 2.00 L of solution. Calculate the pH
of this buffer? (Ka = 1.8x105)
2. What is t
a) Expresstherateofthisreact ion intermsofconcentrationsofA,B,CandD.
b) Atsomepointinthereaction[B]=0.9986Mand13.20minutes later
1. A buffer is prepared by adding 20.0 g of acetic acid (HC2H3O2) and 20.0 g of sodium acetate
(NaC2H3O2) in enough water to prepare 2.00 L of solution. Calculate the pH of this buffer?
(Ka = 1.8x105)
A + 3B 2C + 2D
1. Consider the following reaction:
a) Express the rate of this reaction in terms of concentrations of A, B, C and D.
Rate = -
b) At some point in t
Reactions that can go in both directions are called reversible reactions.
These reactions seem to stop before they go to completion.
When the rate of the forward and reverse reactions become equal, an equilibr