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A-level Chemistry > Enthalpy definitions > Flashcards

Enthalpy definitions Flashcards

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1
Q

enthalpy change

A

heat energy transferred in a reaction at constant pressure

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2
Q

standard enthalpy of formation

A

enthalpy change when 1 mole of a compound is formed from its elements in standard states, standard conditions

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3
Q

standard enthalpy of combustion

A

enthalpy change when 1 mole of a compund is completely burned in oxygen, standard states, standard conditions

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4
Q

bond dissociation enthalpy

A

enthalpy change when 1 mole of covalent bonds are broken in gaseous state

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5
Q

enthalpy of neutralisation

A

enthalpy change when 1 mole of water is formed in reaction between acid & alkali, standard conditions

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6
Q

1st ionisation energy

A

enthalpy change when each atom in 1 mole gaseous atoms loses 1 e- to form 1 mole gaseous 1+ ions

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7
Q

1st electron affinity

A

enthalpy change when each atom in 1 mole gaseous atoms gains 1 e- to form 1 mole gaseous 1- ions

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8
Q

enthalpy of atomisation

A

enthalpy change when 1 mole gaseous atoms produced from an element in its standard state under standard conditions

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9
Q

hydration enthalpy

A

enthalpy change when 1 mole gaseous ions become hydrated (dissolve in water, form 1 mole aqueous ions in aqueous solution)

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10
Q

enthalpy of solution

A

enthalpy change when 1 mole ionic solid dissolves in enough water that dissolved ions don’t interact

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11
Q

lattice enthalpy of formation

A

enthalpy change when 1 mole solid ionic compound formed from constituent gaseous ions

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12
Q

lattice enthalpy of dissociation

A

enthalpy change when 1 mole solid ionic compound broken up into constituent gaseous ions

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13
Q

enthalpy of vapourisation?

A

enthalpy change when 1 mole liquid -> gas, standard conditions

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14
Q

enthalpy of fusion?

A

enthalpy change when 1 mole solid -> liquid

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15
Q

mean bond enthalpy

A

enthalpy change when 1 mole gaseous molecules each breaks a covalent bond to form 2 free radicals, averaged over range of compounds

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16
Q

Born-Haber cycle

A

⬆️1st ionisation energy metal
⬆️atomisation enthalpy metal
⬆️atomisation enthalpy non-metal
⬇️enthalpy of formation salt

RHS:
⬇️1st electron affinity non-metal
⬇️lattice enthalpy of formation salt

A-level Chemistry (3 decks)

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