Chapter 19 Lattice energy

What is Lattice Energy?

• one mole of an ionic compound is formed from its gaseous ions under standard conditions

• one mole of electrons is added to one mole of gaseous atoms to form one mole of gaseous 1- ions under standard conditions

• one mole of an ionic compound is formed from its atoms under standard conditions

• one mole of gaseous atoms is formed from its element under standard conditions

Tags

NGSS.HS-PS1-4

What is the first electron affinity?

• one mole of electrons is added to one mole of gaseous 1- ions to form one mole of gaseous 2- ions under standard conditions

• one mole of gaseous atoms is formed from its element under standard conditions

• one mole of electrons is added to one mole of gaseous atoms to form one mole of gaseous 1- ions under standard conditions

If we want to calculate lattice energy we use

• Hess's law

• Born-Haber cycle

• Enthalpy change of formation

• Electron Affinity

Factors affecting the value of lattice energy

• the size of the ion

• the charge of the ion

• the size of the ion and the charge of the ion

Factors affecting anion polarisation

• ­Charge density of the cation

• ­The polarisability of the anion

The atomic radius of the elements ........ down group 2 from beryllium to barium

Tags

NGSS.HS-PS1-1

The first ionization energy of the elements..... down group 2

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

The melting points of the elements.......... down group 2, with the exception of magnesium to calcium

As we move down the group a ......... temperature is needed to decompose the carbonates

Tags

NGSS.HS-PS1-1

The solubility of the group 2 hydroxides ........... down the group

• increase

• decreases

• increases

• decreases