27.8. H http://www.ck12.org
An organic compound that is made up of only carbon and hydrogen.
hydrogenation
A reaction that occurs when molecular hydrogen is added to an alkene to produce an alkane.
hydrogen bond
An intermolecular attractive force in which a hydrogen atom that is covalently bonded to a small, highly
electronegative atom is attracted to a lone pair of electrons on an atom in a neighboring molecule.
hydronium ion (H 3 O+)
An ion consisting of a water molecule with an attached hydrogen ion.
hypothesis
A testable conjecture that proposes an answer to a research question.