Chemical Energetics Definitions [COMPLETED]

Question	Answer
Standard Enthalpy Change of Reaction	Enthalpy change when molar quantities of reactants stated in the chemical reaction react to form products at 298K and 1 bar
Standard Enthalpy Change of Formation	Enthalpy change when one mole of a compound is formed from its constituent elements in their standard states at 298K and 1 bar
Standard Enthalpy Change of Combustion	Energy evolved when one mole of a substance is completely burnt in excess oxygen at 298K and 1bar
Standard Enthalpy Change of Neutralisation	Enthalpy change when an acid reacts with a base to form one mole of water in dilute aqueous solution at 298K and 1bar
Standard Enthalpy Change of Atomisation	Enthalpy absorbed to form one mole of gaseous atoms from the element in its standard state at 298K and 1 bar OR Enthalpy absorbed to form gaseous atoms from one mole of the compound at 298K and 1 bar
Bond Energy	Energy required to break one mole of a covalent bond between two aroms in the gaseous state
Ionisation Energy	Energy required to remove one mole of electrons from one mole of gaseous atoms to form one mole of gaseous singly charged cations
Electron Affinity	Enthalpy change when one mole of gaseous atoms gains one mole of electrons to form one mole of gaseous singly charged anions
Lattice Energy	Energy evolved when one mole of pure solid ionic compound is formed from its consituent gaseous ions
Standard Enthalpy Change of Hydration	Energy evolved when one mole of the gaseous ions is dissolved in a large amount of water to form one mole of aqueous ions at 298K and 1 bar
Standard Enthalpy Change of Solution	Enthalpy change when one mole of a substance is completely dissolved in a large excess of solvent to form an infinitely dilute solution at 298K and 1 bar
Entropy	Quantity that measures degree of disorder

Standard Enthalpy Change of Reaction

Enthalpy change when molar quantities of reactants stated in the chemical reaction react to form products at 298K and 1 bar

Standard Enthalpy Change of Formation

Enthalpy change when one mole of a compound is formed from its constituent elements in their standard states at 298K and 1 bar

Standard Enthalpy Change of Combustion

Energy evolved when one mole of a substance is completely burnt in excess oxygen at 298K and 1bar

Standard Enthalpy Change of Neutralisation

Enthalpy change when an acid reacts with a base to form one mole of water in dilute aqueous solution at 298K and 1bar

Standard Enthalpy Change of Atomisation

Enthalpy absorbed to form one mole of gaseous atoms from the element in its standard state at 298K and 1 bar OR Enthalpy absorbed to form gaseous atoms from one mole of the compound at 298K and 1 bar

Bond Energy

Energy required to break one mole of a covalent bond between two aroms in the gaseous state

Ionisation Energy

Energy required to remove one mole of electrons from one mole of gaseous atoms to form one mole of gaseous singly charged cations

Electron Affinity

Enthalpy change when one mole of gaseous atoms gains one mole of electrons to form one mole of gaseous singly charged anions

Lattice Energy

Energy evolved when one mole of pure solid ionic compound is formed from its consituent gaseous ions

Standard Enthalpy Change of Hydration

Energy evolved when one mole of the gaseous ions is dissolved in a large amount of water to form one mole of aqueous ions at 298K and 1 bar

Standard Enthalpy Change of Solution

Enthalpy change when one mole of a substance is completely dissolved in a large excess of solvent to form an infinitely dilute solution at 298K and 1 bar

Entropy

Quantity that measures degree of disorder

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Chemical Energetics Definitions [COMPLETED]

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	Created by Megan Ching almost 7 years ago