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Aqa A-level Chemistry > Thermodynamics > Flashcards

Flashcards in Thermodynamics Deck (18)
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1

Define enthalpy change of formation

Enthalpy change when one mole of a substance is formed from its constituent elements with all substance in their substances
-exothermic

2

Define enthalpy change of combustion

Enthalpy change when one mole of a substance undergoes complete combustion in oxygen with all substances in standard states
-exothermic

3

Define enthalpy of neutralisation

enthalpy change when 1 mole of water is formed in a reaction between an acid and alkali under standards conditions
-exothermic

4

Define 1st ionisation enthalpy

Enthalpy change when each atom in one mole of gaseous atoms loses one electron to form one mole of gaseous 1+ ions
-endothermic

5

Define 2nd ionisation energy

Enthalpy change when each ion in one mole of gaseous 1+ ions loses one electron to form one mole of gaseous 2+ ions
-endothermic

6

Define 1st electron affinity

Enthalpy change when each atom in one mole of gaseous atoms gains one electron to form one mole of gaseous 1-ions
exothermic

7

Define 2nd electron affinity

Enthalpy change when each ion in one mole of gaseous ions gains one electron to form one mole of gaseous 2- ions
endothermic

8

Define enthalpy change of atomisation

Enthalpy change when one mole of gaseous atoms is produced from an element in its standard state
-endothermic

9

Define hydration enthalpy

Enthalpy change when one mole of gaseous ions become hydrated(dissolved in water)
-exothermic

10

Define enthalpy of solution

Enthalpy change when one mole of an ionic solid dissolves in an amount of water large enough so that the dissolved ions are well separated and do not interact with each other
exothermic/endothermic

11

Define bond dissociation enthalpy

Enthalpy change when one mole of covalent bond is broken in the gaseous state
-endothermic

12

Define lattice enthalpy of formation

Enthalpy change when one mole of a solid ionic compound is formed from into its constituent ions in the gas phase
exothermic

13

Define lattice enthalpy of disassociation

Enthalpy change when one mole of a solid ionic compound is broken up into its constituent ions is the gas phase
endothermic

14

Enthalpy change of vaporisation

Enthalpy change when one mole of a liquid is turned into a gas
endothermic

15

Define enthalpy of fusion

Enthalpy change when one mole of a solid is turned into a liquid
endothermic

16

Define bond enthalpy

Mean value across a range of compounds containing that bond

17

Define enthalpy change

The heat change measured under conditions of constant pressure

18

Define standard conditions

100kPa and stated temp. (eg 298K)