Definitions - Y2

Question 1

Define enthalpy change of formation

Answer 1

The enthalpy change when 1 mole of the compound is formed from its elements under standard conditions (298K
and 100kpa),
- check to makes ure that all reactants and products being in their standard states

Question 2

Define lattice enthalpy (of formation)

Answer 2

The enthalpy change when 1 mole of ionic compounds is formed from its gaseous ions under standard states and conditions.

Question 3

Define the term enthalpy change of 1st ionisation

Answer 3

The enpalthy change required to remove one mole of electrons from one mole of gaseous atoms to form 1 mole of **made from one mole of gaseous atoms

Question 4

Define the term enthalpy change of hydration

Answer 4

The enthalpy change when 1 mole of gaseous ions forms hydrated ions

Question 5

Define the term enthalpy change of solution

Answer 5

The energy change when 1 mole of a compound dissolves in water

Question 6

Define the term enthalpy change of atomisation

Answer 6

the enthalpy
change when 1 mole of gaseous atoms is formed
from the element in its standard state

Question 7

Define the term enthalpy change of First electron affinity

Answer 7

the enthalpy change that
occurs when 1 mole of gaseous atoms gain 1 mole of electrons to form 1 mole of gaseous ions with a –1
charge

Question 8

Define the term enthalpy change of second electron affinity

Answer 8

the enthalpy change
when one mole of gaseous 1- ions gains one
electron per ion to produce gaseous 2- ions.

Question 9

Define the term First Ionisation enthalpy

Answer 9

the enthalpy change
required to remove 1 mole of electrons from 1 mole
of gaseous atoms to form 1 mole of gaseous ions
with a +1 charge

Question 10

Define the term second Ionisation enthalpy

Answer 10

the enthalpy
change to remove 1 mole of electrons from one mole
of gaseous 1+ ions to produces one mole of gaseous
2+ ions