Definitions I struggle with

Question 1

Enthalpy of reaction ΔrH

Answer 1

enthalpy change that accompanies a reaction in the molar quantities shown in a chemical equation under standard conditions, with all reactants and products in their standard states

Question 2

Enthalpy of formation ΔfH

Answer 2

enthalpy change when one mole of compound is formed from its constituent elements under standard conditions

Question 3

Enthalpy of combustion ΔcH

Answer 3

enthalpy change when one mole of substance is burnt completely in excess oxygen under standard conditions

Question 4

Electron affinity

Answer 4

The enthalpy change when one mole of electron is added to one mole of atoms in the gaseous phase to form one mole of -1 ions

Question 5

Lattice Enthalpy

Answer 5

ΔHlatt is the enthalpy change when 1 mole of ionic substance is formed from its gaseous ions under standard conditions

Question 6

Enthalpy of solution

Answer 6

DeltasolutionH is the enthalpy change when one mole of ionic compound is completely dissolved in water under standard conditions

Question 7

Enthalpy of hydration

Answer 7

Delta Hhydration¬ is the enthalpy which takes place when one mole of gaseous ions is dissolved in water forming one mole of aqueous ions under standard conditions

Question 8

Standard entropy change

Answer 8

The standard entropy change is the entropy change that accompanies a reaction in the molar quantities expressed in the equation, under standard conditions