what temp. does freon become solid and what causes the cold effect when changeing from liquid to gas?

it all depends, because freon absorbs heat, as it turns to a gas it will cool down. now that i have the proper answer, it's not down to the basic kinetic theory. the reaso they seem cooler when turning into a gas than when they are liquid is because as they evaporate, they absorb the heat from the suroundings. this means that as the gs is actualy warmer than as a liquid, the surondings become cooler, and as thermometers take both the temperature of the gas and the suroundings, there is a general drop in the suronding ambience. this is called an EDOTHERMIC REACTION.

they might create heat but they require heat to gain momentum

for the first part look up the Melting point of freon, its good practice.

For the second part you have it mixed up, energy such as thermal energy can be absorbed by a molecule and stored in several ways. One way, is kinetic motion and another is phase change. So as you say, heat can be stored by a molecule in its motion. But also, the change from liquid to gas absorbs energy and is more commonly known as an endothermic process. You can actually look up the amount of heat that will be absorbed in this process, it is known as the heat of vaporization.
If this is for a thermodynamics class the story involves entropy, and some other good stuff. But for anyone other class that is the explanation they will expect.

Consider a liquid (water) and its gas (steam).  To convert water to steam, you first have to heat water to 100 C.  At that point additional energy begins to boil the water.  This is the process where water molecules have enough energy to overcome the attractive force between them (called cohesion, in this case, due to the dipolar attraction between waters).

You are right in that gases are higher energy (could say hotter), but that's because they've taken the energy from whatever heat source was around when they vaporized.

Back to the water example, water on your skin feels cold because it's absorbing heat from your skin and as the water evaporates, that heat is carried away by the vapor phase molecules (which are moving faster than the liquid form).

The fast-moving particles from your question have a lot of heat stored, that's why steam at 100 C is more likely to burn your skin than water at 100 C.  It has more heat to transfer.

As for freon, it depends on which freon you're talking about.  Freon 12 (one of the ones phased out because of ozone depletion) melts at -158 C (Merck Index).