C22 - Enthalpy And Entropy Flashcards
1
Q
What is lattice Enthalpy?
A
- A measure of the strength of ionic bonding in a giant ionic lattice
2
Q
What type of reaction is Lattice Enthalpy?
A
Exothermic - value for Enthalpy change will always be negative
3
Q
What processes are involved in route on of the Born-Haber cycle?
A
- Formation of gaseous atoms
- Formation of gaseous ions
- Lattice formation
4
Q
What is the formation of gaseous atoms?
A
- Changing the elements in thier standard states into gaseous atoms
- Endothermic - involves bond breaking
5
Q
What is the formation of gaseous ions?
A
- Changing the gaseous atoms into positive and negative gaseous ion
- Endothermic - bond breaking
6
Q
What is lattice formation?
A
- Changing the gaseous ions into the solid ionic lattice
- Lattice Enthalpy = exothermic
7
Q
What process is involved in route 2 of the Born-Haber cycle?
A
- Conversion of elements in their standard states directly to the ionic lattice
- One Enthalpy change - Enthalpy change of formation
- Exothermic
8
Q
What is the standard Enthalpy change of formation?
A
The Enthalpy change that takes place where one mole of a compound is formed from its elements under standard conditions and standard states
9
Q
What type of compound formed in standard Enthalpy of formation?
A
Ionic compound in its solid lattice
