Chapter 22 - Enthalpy and Entropy

Question 1

What are strong ionic bonds?

Answer 1

Electrostatic attractions between oppositely charged ions

Question 2

What is meant by lattice enthalpy?

Answer 2

The enthalpy change that accompanies the formation of=f one mole of an ionic compound from its gaseous ions under standard conditions

Question 3

How can we measure lattice enthalpy?

Answer 3

Must be calculated indirectly using known energy changes in an energy cycle - a Born-Haber cycle

Question 4

What is the enthalpy change of formation?

Answer 4

The enthalpy change that occurs when 1 mole of a compound is formed from its elements in their standard states

Question 5

What is the enthalpy change of atomisation?

Answer 5

The enthalpy change that occurs when 1 mole of gaseous atoms is formed from the element in its standard state

Question 6

What is first ionisation enthalpy?

Answer 6

The enthalpy change required to remove one electron from each atom in 1 mole of gaseous atoms to form 1 mole of gaseous 1+ ions

Question 7

What is first electron affinity?

Answer 7

The enthalpy change that takes place when one electron is added to each atom in 1 mole of gaseous atoms to form 1 mole of gaseous 1- ions

Question 8

If the positive ion has a greater