Chapter 19: Lattice Energy Flashcards

1
Q

Lattice energy

A

Enthalpy change when 1 mole of an ionic compound is formed from its gaseous ions under standard conditions

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2
Q

Enthalpy change of atomisation

A

The enthalpy change when 1 mole of gaseous atoms is formed from its element under standard conditions

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3
Q

Electron affinity

A

The first electron affinity, is the enthalpy change when 1 mole of electrons is added to 1 mole of gaseous atoms to form 1 mole of gaseous 1- ions under standard conditions

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4
Q

The second electron affinity

A

The enthalpy change when 1 mole of electrons is added to 1 mole of gaseous 1- ions to form 1 mole of gaseous 2- ions under standard conditions

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5
Q

Converting solid atoms to gas atoms

A

Atomisation

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6
Q

Convert gas atoms to gas ions

A

1st ionization

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7
Q

Convert molecules to atoms

A

Atomisation

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8
Q

How does size affect lattice energy

A

Larger radius with the same charge have lower charge density because charge is spread over a larger area making the lattice energy less exothermic

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9
Q

How does charge affect lattice energy

A

Greater charge in anions and ions, attract each other more strongly. Ions of similar size but greater ionic charge results in higher charge density and stronger ionic bonds

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10
Q

Ion polarization

A

Distortion of electron cloud on anion by cation

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11
Q

Polarizing power

A

Ability of cation to attract electrons and distort anion

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12
Q

Degree of polarization of an anion

A

Charge density of the cation and polarisibility, ease at which it can be polarized

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13
Q

How is an anion more likely to be polarized

A

Cation is small with a charge of +2 or 3 and anion is big with a charge of -2 or 3

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14
Q

Enthalpy change of hydration

A

When 1 mole of a specified gaseous ions dissolves in sufficient water to form a very dilute solution

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15
Q

Enthalpy change of solution

A

Energy absorbed or released when 1 mole of an ionic solid dissolves in sufficient water to form a very dilute solution

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