CHEM 110 Chapter Notes - Chapter 8: Network Covalent Bonding, Lattice Energy, Bond-Dissociation Energy

• School: McGill University
• Department: Chemistry
• Course: CHEM 110
• Professor: Laura Pavelka

Document Summary

Atomic properties and chemical bonds: bonding lowers the potential energy between positive and negative particles. Increases kinetic energy: strength of chemical bonds determine the properties of a substance, accumulation of electron density in binding region balances the repulsive/attractive forces. *there are gradations in type of bonding between atoms from different groups/periods so cannot always predict type of bond (i. e. be and cl form more covalent than ionic bonds) The ionic bonding model: transfer of electrons from metal to non-metal atoms to form ions that attract each other into a solid compound. Ionization energy of cation/first atom is absorbed to lose 1 mol of valence electrons: first electron affinity is energy released when anion gain 1 mol electrons. Cation and anion combine: more energy is released when the separate gaseous ions coalesce into crystalline solid because each ion attracts several oppositely charged ions, negative enthalpy change, lattice energy.