Module 2 - F325

Question 1

Lattice Enthalpy

Answer 1

Lattice enthalpy is the enthalpy change that accompanies the formation of one mole of an ionic compound from its gaseous ions under standard conditions.

Question 2

Hess’ Law

Answer 2

Hess’ Law states that if a reaction can take place by more than one route and the initial and final conditions are the same, the total enthalpy change is the same for each route.

Question 3

Standard enthalpy change of formation

Answer 3

The standard enthalpy change of formation is the enthalpy change that takes place when one mole of a compound is formed from its constituent elements in their standard states under standard conditions.

Question 4

Enthalpy change of atomisation

Answer 4

The enthalpy change of atomization is the enthalpy change that takes place when one mole of gaseous atoms forms from the element in its standard state.

Question 5

First ionization energy

Answer 5

The first ionization energy is the enthalpy change accompanying the removal of one electron from each atom in one mole of gaseous atoms to form one mole of gaseous 1+ ions.

Question 6

Second ionization energy

Answer 6

The second ionization energy is the enthalpy change accompanying the removal of one electron from each ion in one mole of gaseous 1+ ions to form one mole of gaseous 2+ ions.

Question 7

First electron affinity

Answer 7

The first electron affinity is the enthalpy change accompanying the addition of one electron to each atom in one mole of gaseous atoms to form one mole of gaseous 1- ions.

Question 8

Second electron affinity

Answer 8

The second electron affinity is the enthalpy change accompanying the addition of one electron to each ion in one mole of gaseous 1- ions to form one mole of gaseous 2- ions.

Question 9

Standard enthalpy change of solution

Answer 9

The standard enthalpy change of solution is the enthalpy change that takes place when one mole of a compound is completely dissolved in water under standard conditions.

Question 10

Standard enthalpy change of hydration

Answer 10

The standard enthalpy change of hydration is the enthalpy change that takes place when one mole of isolated gaseous ions is dissolved in water forming one mole of aqueous ions under standard conditions.

Question 11

Entropy

Answer 11

Entropy, S, is the quantitative measure of the degree of disorder in a system.

Question 12

Standard entropy change of reaction

Answer 12

Standard entropy change of reaction, is the entropy change that accompanies a reaction in the molar quantities expressed in a chemical equation under standard conditions, all reactants and products being in their standard states.

Question 13

Free energy change

Answer 13

The free energy change is the balance between enthalpy, entropy and temperature for a process.

Question 14

Oxidation

Answer 14

Oxidation is the loss of electrons, or an increase in oxidation number

Question 15

Reduction

Answer 15

Reduction is gain of electrons, or a decrease in oxidation number

Question 16

Standard electrode potential

Answer 16

The standard electrode potential of a half cell, is the e.m.f of a half cell compared with a standard hydrogen half cell, measured at 298K with solution concentrations of 1moldm and a gass pressure of 100kPa