Enthalpy change definitions

emilyorr97
Flashcards by , created almost 5 years ago

Flashcards for learning the enthalpy change definitions for AQA A2 chemistry (unit 5 chapter 12.1)

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emilyorr97
Created by emilyorr97 almost 5 years ago
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Question Answer
Standard enthalpy of formation the enthalpy change when one mole of a compound is formed from its constituent elements under standard conditions, all products and reactants in their standard states
standard enthalpy of atomisation the enthalpy change which accompanies the formation of one mole of gaseous atoms from the element in its standard state, under standard conditions
first ionisation energy the standard enthalpy change when one mole of gaseous atoms is converted into one mole of gaseous ions, each with a single positive (unipositive) charge
second ionisation energy refers to the loss of a mole of electrons from a mole of unipositive ions
first electron affinity the standard enthalpy change when one mole of gaseous atoms is converted to one mole of gaseous ions, each with a single negative (uninegative) charge
second electron affinity the enthalpy change when a mole of electrons is added to a mole of gaseous ions, each with a single negative charge, to form ions each with two negative charges
lattice formation enthalpy the standard enthalpy change when one mole of solid ionic compound is formed from its gaseous ions
lattice dissociation enthalpy when one mole of ionic compound separates into its gaseous ions
enthalpy of hydration the standard enthalpy change when water molecules surround one mole of gaseous ions
enthalpy of solution the standard enthalpy change when one mole of solute dissolves completely in sufficient solvent to form a solution in which the molecules or ions are far enough apart not to interact with each other
mean bond enthalpy the enthalpy change when one mole of gaseous molecules each breaks a covalent bond to form two free radicals, averaged over a range of compound