Thermal Chemistry 04 Flashcards
activation energy definition
minimum energy which the reacting particles must possess in order to overcome the energy barrier before becoming products
enthalpy change of formation definition
the enthalpy change when 1 mole of a substance is formed from its constituent elements in their standard states at 298k and 1 bar
enthalpy change of combustion definition
heat evolved when 1 mole of substance is completely burnt in excess oxygen at 298k and 1 bar
enthalpy change of neutralisation definition
the heat evolved when 1 mole of water is formed in the neutralisation reaction between an acid and a base
specific heat capacity equation
mc x change in T
heat capacity equation
C x change in T
bond dissociation energy definition
energy required to break 1 mole of a PARTICULAR COVALENT BOND in a specific molecule gaseous state
bond energy definition
the average energy required to break 1 mole of a covalent bond
calculation of bond energy
bonds broken-bonds formed
lattice energy definition
the heat evolved when 1 mole of solid ionic compound is formed from its constituent ions.
what is required for the standard enthalpy change of formation of a compound?
they have to be in their standard states (g,s,l,aq)
calculation of energy produced from combustion
reactants - products
