Ionic Solid, Lattice Energy & Defects

Identify which of the following statement is NOT TRUE.

• 1. Ions are considered to be spherical and their size is given by the ionic radii that have been defined for most

     elements. The structures of the salts formed from ions is based on the close packing of spheres.

• The ionic compound is formed from the sharing of electrons between cations and anions.

• Electrostatic attraction between positively charged and negatively charged ions are responsible for the formation of lattice crystals.

• In ionic bonding, the electrostatic attraction is less directional in comparison as the ones in covalent bonding. Thus ionic structures adopt many possible structural types.

Which ONE of the following is NOT belong to antifluorite crystal structure?

• K₂O

• Na₂O

• KCl

• Li₂O

Tags

NGSS.HS-PS1-3

What is the radius ratio of ions in CaF₂? Given the ionic radii of Ca²⁺ ion and F^- ion are 99 pm and 136 pm, respectively. Given your answer to 3 decimal places.

What is the coordination number of ions in the ionic CaF₂ compound?

• 4:4

• 6:6

• 8:8

• 8:4

For 6:6 and 6:3 coordination numbers structure, what type of hole (interstitial site) is present?

• cubic

• tetrahedral

• octahedral

• none

Which equation described the standard enthalpy of formation of KCl?

• K(s) + 1/2 Cl₂ (g) -> KCl (s)

• K(l) + 1/2 Cl₂ (g) -> KCl (s)

• K(l) + 1/2 Cl₂ (l) -> KCl (l)

• K(s) + 1/2 Cl₂ (g) -> KCl (l)

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

Given the dissociation energy of Br₂ is 193 kJ/mol. In order to calculate the lattice enthalpy of KBr, what is the correct value for the dissociation energy to be used in the Born-Haber cycle?

• 193 kJ/mol

• 193/2 kJ/mol

• 2 x 193 kJ/mol

Which paramaters in the Born-Mayer equation are proportional to the lattice enthalpy?

• Avogrado number & internuclear distance.

• electron charge & internuclear distance.

• ionic charges & Madelung constant

• ionic charges & internuclear distance.

Between LiCl, LiBr, and LiF, which one has the highest lattice enthalpy?

Tags

NGSS.HS-PS2-4

Which parameter is not useful in the calculation of lattie enthalpy using the Kapustinskii equation?

• Madelung constant

• No. of ions

• Sum of ionic radii

• ionic charges