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A-Level Chemistry Edexcel > 13A: Lattice energy > Flashcards

13A: Lattice energy Flashcards

Use PPQs for spec points: 3, 10

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1
Q

Define lattice energy

A

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

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2
Q

Define enthalpy change of atomisation

A

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

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3
Q

Define first electron affinity

A

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

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4
Q

Define second electron affinity

A

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

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5
Q

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

A

Lattice energy

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6
Q

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

A

The degree of covalent bonding

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7
Q

Describe polarisation as applied to ions.

A

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

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8
Q

Describe the factors that determine the polarising power of a cation

A

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

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9
Q

Describe the factors that determine the polarisability of an anion

A

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

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10
Q

Define enthalpy change of solution

A

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

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11
Q

Define enthalpy change of hydration

A

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

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12
Q

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

A

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

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13
Q

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

A

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

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14
Q

State how to predict the solubilty of a ionic compound.

A

It is soluble if
Enthalpy change of hydration > Lattice enthalpy

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A-Level Chemistry Edexcel (34 decks)

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