The solubility of amphetamine in ethanol depends on the specific salt. For instance, amphetamine sulfate has different properties than amphetamine chloride. Both of these salts are very different from amphetamine free base. The free base is soluble in ethanol, though the salts have lower solubility in this solvent.

ic amphetamine salts are generic for Adderall IR, which contains 4 different types of amphetamine salts, racemic amphetamine aspartate monohydrate, racemic amphetamine sulfate, dextroamphetamine saccharide, and dextroamphetamine sulfate. All of these are amphetamine salts. ic amphetamine salts contain dextroamphetamine as well racemic amphetamine mixtures, which contain equal parts levo- and dextro- amphetamine.

So the difference is that ic amphetamine salts (Adderall IR) contains ~75% dextoamphetamine and ~25% levoamphetamine.

it highly is, amphetamine works on a chemicla level in the brain that produces hormones that stimulates areas in the brain, so that you are convinced that you are not tired and you feel less pain. compare to effects of adrenalin and noradrenalin

depends if it is an amphetammines as dexedrine, or biphetamine thos are stimulants. If they are amphetamine variants like DOM, X, MDMA, ecstasy ther are allucinogens

Amphetamine salts is a drug derived from amphetamine; for details see the link below.