Ions and Ionic Compounds

A Compound is discovered to have a melting point of -100^oC. Which could be true of this compound?

Hint: does the table provide enough information to narrow it down to just one type of bond?

• It definitely has an ionic bond.

• It definitely has a polar covalent bond.

• it has either a polar covalent bond or a nonpolar covalent bond

• it has either a polar covalent bond or an ionic bond

Which could NOT be the melting point of Cr₂O₃?

• 2375^oC

• 950^oC

• 148^oC

• 3342^oC

Which is supported by the data in the table?

• Nonpolar Covalent bonds have a high boiling point

• polar covalent bonds have high melting points

• ionic bonds have low melting points

• ionic bonds have high boiling points

Which is NOT true of the Sc³⁺ ion?

• it has the same electron configuration as Ar

• it is a scandium ion with three positive charges

• it is considered to be a different element than a neutral Sc atom

• it was formed by the loss of 4s and 3d electrons

Of the salts below, which would require the most energy to break the ionic bonds?

Hint: think of the atomic radius of each atom forming the compound. If the atomic radius is smaller, the ionization energy increases (ie. smaller atoms have less electrons, so the nucleus is less shielded)

• BaCl₂

• LiF

• NaBr

• KI