Energetics Definitions Flashcards
Define standard enthalpy change of formation
Energy CHANGE when 1 mol of subst. is formed from its ELEMENTS
Define enthalpy change
Energy CHANGE when molar qty in chemical rxn react that standard conditions 298K 1 bar
Define enthalpy change of combustion
Energy RELEASED when 1 mol of subst. is COMPLETELY burnt in EXCESS oxygen at standard conditions 298K 1 bar
Define enthalpy change it neutralisation
Energy RELEASED when acid + base react to form 1 mol of WATER at standard conditions 298K 1bar
Define enthalpy change of atomisation
Energy ABSORBED when 1 mol of gaseous atoms formed from its ELEMENT at 298K 1 bar
Define Bond energy
AVERAGE energy ABSORBED to break 1 mol of covalent bond into (g) into (g) atoms 298K 1 bar
Define 1st IE
Energy ABSORBED when 1 mol of gaseous atoms loses 1 mol e- to form 1 mol +ve (g) ion
A (g)-> A+(g) + e-
Define 1st IE
Energy ABSORBED when 1 mol of gaseous atoms loses 1 mol e- to form 1 mol +ve (g) ion
A (g)-> A+(g) + e-
Define 2nd IE
Same as 1st IE but energy ABSORBED to remove 1 mol e- from +ve charged (g) atom
A+(g) -> A²+ (g) + e-
Define 1st electron affinity
Energy RELEASED when 1 mol of gaseous atoms gains 1 mol of e- to form -ve (g) ion
O(g) + e- -> O- (g)
Define 1st electron affinity
Energy RELEASED when 1 mol of gaseous atoms gains 1 mol of e- to form -ve (g) ion
O(g) + e- -> O- (g)
Define 2nd electron affinity
Energy ABSORBED ENDO when 1 mol of singly charged -ve (g) ion gains 1 mol of e- to form 1 mol doubly -ve (g) ion
A-(g) +e -> A²- (g)
Define 2nd electron affinity
Energy ABSORBED ENDO when 1 mol of singly charged -ve (g) ion gains 1 mol of e- to form 1 mol doubly -ve (g) ion
A-(g) +e -> A²- (g)
Define lattice energy
Energy RELEASED when 1 mol ionic cmpd formed from its (g) ions at standard conditions 298K 1 bar
Na+ (g) + Cl-(g) -> NaCl(s)
Define lattice energy
Energy RELEASED when 1 mol ionic cmpd formed from its (g) ions at standard conditions 298K 1 bar
Na+ (g) + Cl-(g) -> NaCl(s)
Define enthalpy change of hydration
Energy RELEASED from 1 mole of (g) ions hydrated under standard conditions 298K 1 bar
Na+(g) -> Na+(aq)
Define enthalpy change of solution
Energy CHANGE when 1 mol of substance is COMPLETELY DISSOLVED IN SOLVENT TO FORM INFINITELY DILUTE SOLUTION standard conditions 298k 1bar
NaCl(s) -> Na+(aq) + Cl-(aq)
Define enthalpy change of solution
Energy CHANGE when 1 mol of substance is COMPLETELY DISSOLVED IN SOLVENT TO FORM INFINITELY DILUTE SOLUTION standard conditions 298k 1bar
Define enthalpy change of vaporisation
Energy ABSORBED when 1 mol of subst converted from (l) to (g) w/o change of temp at 1bar
