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13A: Lattice energy

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Total cards: 14•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (14)

#1
Front (Question)

Define lattice energy

Back (Answer)

The energy change when - 1 mole of an ionic solid is formed - from its gaseous ions

#2
Front (Question)

Define enthalpy change of atomisation

Back (Answer)

The enthalpy change when - 1 mole of gaseous atoms is formed - from its elements in their standard states

#3
Front (Question)

Define first electron affinity

Back (Answer)

The enthalpy change when - 1 mole of gaseous atoms - gains 1 mole of electrons to form 1 mole of gaseous -1 ions

#4
Front (Question)

Define second electron affinity

Back (Answer)

The enthalpy change when - 1 mole of gaseous -1 ions - gains 1 mole of electrons - to form 1 mole of gaseous -2 ions

#5
Front (Question)

State which energy value provides a measure of ionic bond srength.

Back (Answer)

Lattice energy

#6
Front (Question)

State what a comparison of the experimental lattice energy value with the theoretical value would indicate.

Back (Answer)

The degree of covalent bonding

#7
Front (Question)

Describe polarisation as applied to ions.

Back (Answer)

Some of the electron charge on the anion is pulled back towards the cation, The electron field around the anion is distorted.

#8
Front (Question)

Describe the factors that determine the polarising power of a cation

Back (Answer)

Radius: Smaller radius -> more polarisation Charge: Greater charge -> more polarisation

#9
Front (Question)

Describe the factors that determine the polarisability of an anion

Back (Answer)

Radius: Larger radius -> more polarisation Charge: Greater charge -> more polarisation

#10
Front (Question)

Define enthalpy change of solution

Back (Answer)

The enthalpy change when - 1 mole of a substance is completely dissolved - in excess water

#11
Front (Question)

Define enthalpy change of hydration

Back (Answer)

The enthalpy change when - 1 mole of gaseous ions is completely dissolved - in excess water

#12
Front (Question)

Describe the effect of ionic charge and ionic radius on the value of lattice energy

Back (Answer)

Greater ionic charge, Smaller ionic radius -> Stronger ionic bonds -> Greater lattice energy

#13
Front (Question)

Describe the effect of ionic charge and ionic radius on the value of enthalpy change of hydration

Back (Answer)

Greater ionic charge, Smaller ionic radius -> Stronger attraction with water molecules -> more exothermic enthalpy change of hydration

#14
Front (Question)

State how to predict the solubilty of a ionic compound.

Back (Answer)

It is soluble if Enthalpy change of hydration > Lattice enthalpy