Beer, like most things, is a mixture of chemicals. The main chemical in beer is H2O (water). Beer also contains CH3CH2OH (ethanol) and various carbohydrates, plus minor levels of chemicals that give the beer its flavor.Beer is a produced from malted barley, hops, water and fermented with yeast.Malted barley is simply partially germinated barley.here is no formula for beer because beer is not a chemical compound; it is a mixture. You could determine the chemical formula of the ingredients of beer though, like ethyl alcohol. For example, sugar water is not a compound because it is a mixture composed of water (H2O) and glucose (C6H12O6).