aqa chemistry a level with complete solutionscovalent bond answer a shared pair of electrons between non metal elementsco ordinate bond answer a shared pair of electrons where both electrons are supplied by one atomrepulsion in shapes of molecules answer lone pair lone pair > lone pair bonding pair > bonding pair bonding pairelectronegativity answer the power of an atom to attract the pair of electrons in a covalent bondhess' law answer total enthalpy change for a reaction is independent of the route chosenmean bond enthalpy answer the energy required to break a covalent bond into gaseous atoms averaged over different moleculesbonds broken bonds maderelative atomic mass answer the average mass of an atom of an element