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Chemistry 5.2: Enthalpy and Entropy > lattice enthalpy > Flashcards

lattice enthalpy Flashcards

1
Q

what is ‘lattice enthalpy’?

A

a measure of the strength of ionic bonding in a giant ionic lattice

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2
Q

what is the definition of ‘lattice enthalpy’ in terms of enthalpy change?

A

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

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3
Q

is lattice enthalpy endo or exothermic?

A

exothermic
- bonds are formed

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4
Q

define ‘enthalpy of formation’

A

enthalpy change when one mole of a compound forms from its elements under standard conditions

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5
Q

define ‘first ionisation enthalpy’

A

enthalpy change when one electron is removed from one mole of gaseous atoms of an element to form one mole of gaseous + ions

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6
Q

define ‘second ionisation enthalpy’

A

enthalpy change when one electron is removed from one mole of gaseous + ions to form one mole of gaseous 2+ ions

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7
Q

is ionisation enthalpy exo or endothermic?

A

endothermic

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8
Q

is enthalpy of formation exo or endothermic?

A

exothermic

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9
Q

define ‘first electron affinity’

A

enthalpy change when one electron is added to each atom in one mole of gaseous atoms to form one mole of gaseous - ions

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10
Q

define ‘second electron affinity’

A

enthalpy change when one electron is added to each ion in one mole of gaseous - ions to form one mole of gaseous 2- ions

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11
Q

is first electron affinity exo or endothermic?

A

exothermic

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12
Q

is second electron affinity exo or endothermic?

A

endothermic

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13
Q

define ‘enthalpy of atomisation’

A

enthalpy change when one mole of gaseous atoms is formed from its element in standard state

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14
Q

is atomisation exo or endothermic?

A

endothermic

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15
Q

what do we use a born haber cycle for?

A

indirectly calculating lattice enthalpy

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16
Q

what goes at the bottom of a born haber cycle?

A

the solid ionic compound

17
Q

what is the first born haber step and which direction is the arrow?

A

enthalpy of formation
downwards (exothermic)

18
Q

what is the second born haber step and which direction is the arrow?

A

atomisation
upwards (endothermic)

19
Q

what is the third born haber step and which direction is the arrow?

A

ionisation
upwards (endothermic)

20
Q

what is the fourth born haber step and which direction is the arrow?

A

electron affinity
downwards (exothermic)

21
Q

what is the last born haber step and which direction is the arrow?

A

lattice enthalpy
downwards (exothermic)

22
Q

what happens in a born haber cycle if an anion has a charge greater than one?

A

use successive electron affinities
(second is upwards)

Chemistry 5.2: Enthalpy and Entropy (4 decks)

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