Ionisation energies are always measured on gaseous atoms or ions.
Ionisation energies are always measured on atoms or ions in their standard states.
Ionisation energies relate to the formation of positive ions only.
Ionisation energies relate to the formation of positive and negative ions.
Ionisation energies are always endothermic.
Ionisation energies are always exothermic.
Ionisation energies always have a positive enthalpy.
Ionisation energies always have a negative enthalpy.
The second ionisation energy of an element will be smaller than the first if the atom has 2 electrons in its outer shell.
The second ionisation energy of an element is always greater than the first.
Spontaneous reactions are always exothermic.
Some spontaneous reactions are endothermic.
Enthalpies of combustion are always exothermic.
Enthalpies of combustion can be exothermic or endothermic.
Enthalpies of formation are always exothermic.
Enthalpies of formation can be exothermic or endothermic.
Enthalpies of combustion relate to the complete combustion of one mole of the substance.
The equation for a heat of combustion reaction never contains fractions.
The equation for a heat of formation reaction must relate to an actual reaction which will form the compound in question.
Not all heats of formation equations relate to actual reactions which will form the substance in question.
Bond energies relate to the breaking of a bond to form a positive ion and a negative ion.
Bond energies relate to the breaking of a bond to form separate atoms.
Bond energies are always measured using compounds in the gaseous state.
Bond energies are always measured using compounds in their standard states.
The breaking of a bond is an exothermic process.
The breaking of a bond is an endothermic process.
Bond making is exothermic.
Bond making is endothermic.
Tables of bond energies show the actual energy involved in making or breaking that bond.
Tables of bond energies show the average energy involved in making or breaking that bond in a number of different molecules.