Ch 12.3

Question 1

What is the formula for lattice energy?

Answer 1

LE=K (Q1•Q2)/R

K is a constant
Q is the charge of cation and anion
R is the inter ionic distance

Question 2

As the charge goes up what happens to lattice energy

Answer 2

Lattice energy increases

Question 3

As R increases

Answer 3

Lattice energy decreases
And the inverse is the same

Question 4

In what order do we look at problems for lattice energy

Answer 4

1. Charge up LE down
2. Ionic radius down LE up

Question 5

What is lattice energy

Answer 5

Lattice energy happens when ions in the gas phase combine to form a solid.

Question 6

Ionic radius R increases to

Answer 6

The left and bottom of the periodic table