definitions

Question 1

enthalpy of formation

Answer 1

the enthalpy change when 1 mole of a substance is made from its consistuent elements with all substances in their standard states

Question 2

enthalpy of formation endo or exo ?

Answer 2

exo

Question 3

enthalpy of combustion ?

Answer 3

the enthalpy change when 1 mole of a substance fully reacts with oxygen with all substances in their standard states under standard conditions

Question 4

enthalpy of combustion endo or exo ?

Answer 4

exo

Question 5

enthalpy of neutralisation ?

Answer 5

the enthalpy change when1 mole of water is formed in a reaction between an alkali and an acid under standard conditions

Question 6

neutralisation exo or endo ?

Answer 6

exo

Question 7

ionisation enthalpy ? 1st ?

Answer 7

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

Question 8

ionisation enthalpy endo or exo ?

Answer 8

endo

Question 9

electron affinity ? 1st ?

Answer 9

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

Question 10

second electron affinity ?

Answer 10

the enthalpy change when each ion in one mole of gaseous 1- ions gains one electron to form one mole of gaseous 2- ions

Question 11

1st electron affinity endo or exo ?

Answer 11

exo

Question 12

2nd electron affinity endo or exo ?

Answer 12

endo

Question 13

enthalpy of atomisation ?

Answer 13

the enthalpy change when 1 mole of gaseous atoms is produced from an element in its sandard state

Question 14

atomisation endo or exo ?

Answer 14

endo

Question 15

hydration enthalpy ?

Answer 15

enthalpy change when 1 mole of gaseous ions became hydrated
(dissolved in water)

Question 16

hydration enthalpy endo or exo ?

Answer 16

exo

Question 17

enthalpy of solution ?

Answer 17

enthalpy change when 1 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 eachother

Question 18

enthalpy of solution endo or exo ?

Answer 18

varies

Question 19

bond dissociation enthalpy ?

Answer 19

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

Question 20

bond dissociation enthalpy exo or endo ?

Answer 20

endo

Question 21

lattice enthalpy of formation ?

Answer 21

enthalpy change when one mole of a solid ionic compound is formed from its consistuent ions in the gas phase

Question 22

lattice enthalpy of formation exo or endo ?

Answer 22

exo

Question 23

lattice enthalpy of dissociation ?

Answer 23

the enthalpy change when 1 mole of a solid ionic compound is broken up into its constituent ions in the gas phase

Question 24

lattice enthalpy of dissociation exo or endo ?

Answer 24

endo

Question 25

enthalpy of vaporisation ?

Answer 25

enthalpy change when 1 mole of a liquid is turned into a gas

Question 26

vaporisation endo or exo ?

Answer 26

endo

Question 27

enthalpy of fusion ?

Answer 27

the enthalpy change when 1 mole of a solid is turned into a liquid

Question 28

fusion exo or endo ?

Answer 28

endo