Definitions Flashcards
Enthalpy of combustion.
The energy change when one mole of a substance burns in oxygen, all reactants and products in their standards states.
The enthalpy of formation.
The energy change when one mole of a compound is formed from it’s constituent elements in their standard states.
Ionisation energy.
Energy change when one mole of gaseous atoms loses one mole of electrons to form one mole of unipositive ions.
Electron affinity.
Energy change when one mole of electrons is gained by one mole of gaseous atoms to produce one mole of singly charged ions.
Enthalpy of atomisation.
Energy change when one mole of gaseous ions are formed from an element in it’s standard states.
Mean bond enthalpy.
Energy change when one mole of covalent bonds in a gaseous substance is broken averaged over a range of similar compounds.
Lattice enthaply of formation.
Energy change when one mole of a crystalline compound is formed from gaseous ions scattered an infinite distance apart.
Lattice enthaply of dissociation.
Energy change when one mole of a lattice is broken up to produce gaseous ions an infinite distance apart.
Periodicity.
a regularly repeating pattern of atomic, physical, and chemical properties with increasing atomic number.
Define structural isomer.
Molecules that have the same molecular formula, but have a different arrangement of atoms.
