DEFINITIONS Flashcards
What is the enthalpy of a reaction?
The heat energy stored in a chemical reaction
What is enthalpy change?
Heat energy change at constant pressure
What is standard enthalpy of formation?
Enthalpy change when one mole of a compound is formed from its constituent elements, in their standard states
What is enthalpy of combustion?
The enthalpy change when one mole of compound is burnt completely in oxygen, when the reactants are in their standard states
What is bond enthalpy?
The heat energy required to break one mol of covalent bond, in a molecule in a gaseous state
What is the mean bond enthalpy?
Energy required to break one mol of covalent bond, averaged for that bond type in a range of different molecules In the gaseous state
What is the enthalpy of lattice dissociation?
Enthalpy change to separate one mole of a solid ionic compound into its gaseous ions
What is the enthalpy of lattice formation?
Enthalpy change when one mole of solid ionic compound is formed from its gaseous ions
What is the standard enthalpy of atomisation?
The enthalpy change when one mole of gaseous atoms are formed from its element in the standard state
What is the first electron affinity enthalpy?
The enthalpy change when one mole of 1- ions are formed from 1 mol of atoms in the gaseous state
What is first ionisation energy?
The energy required to remove one mole of electrons from one mol of atoms in the gaseous state
What is electronegativity?
The power of an atom to attract a pair of electrons in a covalent bond
What is the enthalpy change of solution?
The enthalpy change when one mole of an ionic substance is dossolved In enough solvent to form an infinitely dilute solution
What is the enthalpy change of hydration?
The enthalpy change when one mole of gaseous ions are converted into one mol of aqueous ions
