4.5 E Effects In Binary Ionic Compounds

Question 0

What type of E indicates how strongly metal/nonmetal ions attract each other in an ionic solid?

Answer 0

Lattice E

Question 1

Why does an ionic solid form from metal/nonmetal ions?

Answer 1

The metals/nonmetals react by transferring e-‘s to form cations/anions that are mutually attracted to one Another. The solid forms bc the collection of cations/anions has a lower E than the original elements.

Question 2

Define lattice E

Answer 2

The change in E that takes place when separate gaseous ions are packed together to form an ionic solid
OR
the E released when an ionic solid forms from its ions (since the solid is the lower level of E)

Question 3

Why does lattice E have a negative sign?

Answer 3

The process of gaseous ions to ionic solid results in decrease (-, subtraction) of E.

Question 4

Lattice E and Coulomb’s law

Answer 4

LE= k[(Q1Q2)/r]
Where k is a proportionality constant that depends on the structure of the solid
Q1 and Q2 are the charges on the ions
r is the shortest distance between the centers of the cations and anions

Question 5

LE increases (ie, more E released) when ionic charges (decrease/increase) and/or the distances between the ions (decrease/increase)

Answer 5

increase

increase