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OCR A-level Chemistry A > Enthalpy definitions > Flashcards

Flashcards in Enthalpy definitions Deck (10):
1

Enthalpy of formation

enthalpy change that occurs when one mole of a compound is formed from its elements

2

Enthalpy of combustion

enthalpy change that occurs when one mole of a substance undergoes complete combustion in excess oxygen

3

Enthalpy of bond dissociation

enthalpy change when one mole of covalent bonds in a gaseous molecule is broken to form gaseous atoms (free radicals)

4

Enthalpy of atomisation

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

5

1st ionisation energy

enthalpy change when one mole of gaseous atoms each loose one electron to produce one mole of gaseous 1+ ions and electrons

6

1st electron affinity

enthalpy change accompanying the addition of one electron to each atom in one mole of gaseous atoms to form one mole of gaseous 1- ions

7

Lattice enthalpy

enthalpy change that accompanies the formation of one mole of a solid ionic compound is formed from its consituent isolated gaseous ions under standard conditions

8

Enthalpy of lattice dissociation

enthalpy change when one mole of a solid ionic compound is split into isolated gaseous ions

9

Enthalpy of hydration

standard enthalpy change that takes place when one mole of isolated gaseous ions is dissolved in water to form one mole of aqueous ions

10

Enthalpy of solution

standard enthalpy change that takes place when one mole of a compound is completely dissolved in water under standard conditions