So now let's look at homogeneous catalysts. Now, homogeneous catalysts are catalysts that are in the same state as our reactant, usually liquid or gas. A great and common example of a homogeneous catalyst are acids. Now, these guys weaken bonds by adding an H plus ion to one of the reactants, thereby lowering the activation energy and speeding up our reaction. For example, let's look at the following reaction. Now, this actually involves a bit of organic chemistry but bear with me and I'll try to explain it.