22 Lattice enthalpy definitions

Question 1

Lattice Enthalpy

Answer 1

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

Question 2

Is lattice enthalpy exothermic or endothermic?

Answer 2

Exothermic, negative sign

Question 3

Standard enthalpy change of formation? **

Answer 3

Enthalpy change that takes place when one mole of a compound is formed from its elements under standard conditions, with all reactants and products in their standard states.

Question 4

Standard enthalpy change of atomisation

Answer 4

Enthalpy change that takes place when one mole of gaseous atoms forms from the element in its standard state

Question 5

Is standard enthalpy change of atomisation endothermic or exothermic?

Answer 5

Endothermic

Question 6

First ionisation energy **

Answer 6

Energy required to remove one electron from each atom in one mole of gaseous atoms of an element to form one mole of gaseous 1+ ions.

Question 7

Is first ionisation energy exothermis or endothermic?

Answer 7

endothermic

Question 8

Second ionisation energy

Answer 8

Energy required to remove one electron from each ion in one mole of gaseous 1+ ions of an element to form one mole of gaseous 2+ ions.

Question 9

First electron affinity

Answer 9

Enthalpy change that takes place when one electron is added to each atom in one mole of gaseous atoms to form one mole of gaseous 1- ions.

Question 10

Is first electron affinity exothermic or endothermic?

Answer 10

exothermic

Question 11

Second electron affinity

Answer 11

Enthalpy change that takes place when one electron is added to each ion in one mole of gaseous 1- ions to form one mole of gaseous 2- ions.

Question 12

Is second electron affinity exothermic or endothermic?

Answer 12

endothermic