# Polarity and Bonding (Worksheet)

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Work in groups on these problems. You should try to answer the questions without referring to your textbook. If you get stuck, try asking another group for help.

## Q1.

Arrange the bonds in each of the following sets in order of increasing polarity:

1. C‐F, Be‐F, O‐F
2. O‐Cl, S‐Br, C‐P
3. C‐S, B‐F, N‐O

## Q2.

Determine based on electronegativity and symmetry if the following molecules are polar or nonpolar.

1. $$HCN$$
2. $$CF_4$$
3. $$COCl_2$$
4. $$NF_3$$

## Q3.

For the following reactions, determine the $$\Delta{H_r}$$ based on bond dissociation enthalpies:

1. $$CH_4 + H_2O_2 \rightarrow C_2H_6O_2$$
2. $$C_2H_4 + HCN \rightarrow C_2H_5CN$$

## Q4.

What is the designation for the hybrid orbitals formed from each of the following combinations of atomic orbitals. What are the bond angles associated with each of these hybrid orbitals?

1. one s and two p
2. one s, three p, and one d
3. one s, three p, and two d

## Q5.

For the following molecules, using valence bond theory, show the orbital overlap of the following molecules. Indicate the hybridization of of all orbitals, and the type of overlap used.

1. $$BCl_3$$
2. $$AlCl_4^‐$$
3. $$CS_2$$
4. $$PF_6^‐$$

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