Lecture on January 31st, 2013
Reactions have two conditions;
1. Products escape, reaction goes until one of the reagents runs out (limiting
2. Products are continued, usually by solvent, so can undergo further
reactions, including the reverse reactions, reactions then “stop” but has
only stopped at the macro level
At the molecular level, things are still happening. But rate of the forward reaction
equals the rate of the reverse reaction. The overall combinations of the chemicals
do not change. The reaction has reached equilibrium.
Charges must balance as well as atoms, aka we need to account for the electrons
(must be same on both sides) atoms have lots of electrons, so easier to count the
positive changes (missing electrons).
Every molecule of compound has a fixed atomic composition.
A mixture is more than one compound and so can have a variety of comp