sentence: People making shortening add hydrogen to the alkene, turning it into an alkane.
sentences_before: Vegetable oils have alkenes in them. Alkenes are liquid and spoil easily.
sentences_after: The alkanes are more solid and stable. A catalyst is used to react the hydrogen with the oil. This makes trans fats, though. Margarine is an example of a hydrogenated spread.
concept_name: People
headings: Hydrogenation
categories: Chemistry