So what exactly are fatty acids? Well, fatty acids are molecules that contain a hydrocarbon chain, and at the end of that hydrocarbon chain, we have a carboxylic acid. So, two types of groups in a fatty acid, the hydrocarbon chain, which is nonpolar, and the carboxylic acid, which is actually polar. And so, because we have a polar and a non polar region, fatty acids are technically amphatic. But because the hydrocarbon section makes up a much larger portion of the fatty acid, fatty acids are non polar molecules, hydrophobic. They will not dissolve in aqueous environments.