Chapter 3

Question 1

A sigma bond is formed by the overlap of atomic orbitals.

Answer 1

True

Question 2

Bonds can be sigma or pi; no antibonding in Valence Bond Theory.

Answer 2

True

Question 3

In transition metals, which are considered valence electrons?

Answer 3

Electrons in the ns and (n-1)d orbitals.

Question 4

Ionic Bonds

Answer 4

Metal + Nonmetal (Normally)

Question 5

Covalent Bond

Answer 5

Nonmetal atoms (Normally)

Question 6

Formal Charge equation

Answer 6

FC=X-(Z/2)-Y where X are the electrons in the free atom, Z are the shared electrons, and Y are nonbonding electrons

Question 7

The octect rule only applies for the second row of the periodic table.

Answer 7

True

Question 8

What are some exceptions to the octect rule?

Answer 8

1. When the number of total electrons is an odd number, no full octects are possible
2. NO, BF3 are electron deficient
3. PCl5 has an expanded octect (possible for 3rd row and below)

Question 9

Molecular Geometries name molecules looking ONLY at bonds.

Answer 9

True

Question 10

Order of polarity of Hydrogen halides in gas form

Answer 10

HF>HCl>HBr>HI

Question 11

Order of polarity of Hydrogen halides in water

Answer 11

HF

Question 12

The bonds in a molecule can be polar but the overall molecule can be nonpolar.

Answer 12

True; because of the overall dipole moment

Question 13

Bond Order equation

Answer 13

Bond Order=(Total # of electron pairs used for a type of bond)/(Total # of bonds of that type)

Question 14

Bond length depends on size of bonded atoms

Answer 14

True; bigger atoms show longer bonds