Energetics Flashcards
what is the enthalpy change of reaction?
The enthalpy change when molar quantities of reactants stated in the chemical equation react to form products at 298 K and 1 bar.
what is the enthalpy change of formation?
The enthalpy change when one mole of compound is formed from its constituent elements in their standard states at 298 K and 1 bar.
what is the enthalpy change of combustion?
The enthalpy change when one mole of a substance is completely burnt in excess oxygen at 298 K and 1 bar.
what is the enthalpy change of neutralisation?
The enthalpy change when an acid reacts with a base to form one mole of water in dilute aqueous solution at 298 K and 1 bar.
what is the enthalpy change of atomisation?
The enthalpy change to form one mole of gaseous atom from the element in its standard state at 298K and 1 bar.
what is the enthalpy change of hydration?
The enthalpy change when one mole of the gaseous ions is dissolved in a large amount of water to form one mole of aqueous ions at 298 K and 1 bar.
what is the enthalpy change of solution?
The enthalpy change when one mole of a substance is completely dissolved in a large excess of solvent to form an infinitely dilute solution at 298 K and 1 bar.
what is bond energy?
The enthalpy change to break one mole of a covalent bond between two atoms in the gaseous state.
what is first ionisation energy?
The enthalpy change to remove one mole of electrons from one mole of gaseous atoms to form one mole of gaseous singly charged cations.
what is first electron affinity?
The enthalpy change when one mole of gaseous atoms gains one mole of electrons to form one mole of gaseous singly charged anions.
what is lattice energy?
The enthalpy change when one mole of pure solid ionic compound is formed from its constituent gaseous ions.
what is the formula for lattice energy?
|L.E.| ∝ | q+ q- / r+ + r-|
what is entropy?
a quantity which measures the degree of disorder of a system.
what is the formula for enthalpy change of reaction?
ΔHr⦵ = ΣmΔHf⦵(products) - ΣnΔHf⦵(reactants)
what is the formula for enthalpy change of reaction using enthalpy change of combustion values?
ΔHr⦵ = ΣmΔHc⦵(reactants) - ΣnΔHc⦵(products)
