Final answer:
Unsaturated fats contain carbon-carbon double bonds and are generally liquid at room temperature, while saturated fats have no double bonds and are usually solid. Mono- and polyunsaturated fats contain one or multiple double bonds, respectively. Trans fats have double bonds in a trans configuration, which can be harmful to health.
Step-by-step explanation:
Unsaturated fats and trans fats involve double bonds between carbon atoms in fatty acid chains. Saturated fats have only single bonds and are typically solid at room temperature, found largely in animal products.
Unsaturated fats, which have one or more double bonds, are usually liquid at room temperature. These fats are predominantly from plant sources and some types of fish. If unsaturated fats have only one double bond, they are called monounsaturated fats; if they have more than one, they are called polyunsaturated fats.
Trans fats are a type of unsaturated fat with at least one double bond in a trans configuration, meaning the hydrogen atoms are on opposite sides of the carbon chain, which can contribute to health problems such as heart disease. These fats can be naturally occurring or created through industrial processes like hydrogenation. Cis fats, on the other hand, have hydrogen atoms on the same side of the double bond, causing a bend in the chain and are more commonly found in nature.