TUTORIAL 1

1. Light near the middle of the ultraviolet region of the electromagnetic radiation spectrum has

a frequency of 2.73 x 1016 s-1. Yellow light near the middle of the visible region of the

spectrum has a frequency of 5.26 x 1014 s-1 (Plancks constant, h = 6.626 x 10-34Js)

a. Calculate the wavelength to each of these two frequencies of light

b. Calculate the energy, in joules, of an individual photon of each.

2. Write the electron configuration for the following elements

a. Br-

b. Se

c. Ge

d. As

e. Co2+

3. Write a set of quantum numbers for the following

a. The eighth electron in oxygen

b. The seventh electron in nitrogen

c. The sixth electron in carbon

d. The ninth electron in fluorine

4. For the following subshells give he values of the quantum numbers (n,l,m l)

a. 4p

b. 3d

c. 3s

d. 5f

5. As the following data shows, removing an electron from N2 forms an ion with a weaker,

longer bond than in the parent molecule, whereas the ion formed from O2 has a stronger,

shorter bond. Explain these facts with diagrams that show the sequence and occupancy of

molecular orbitals.

N2 O2

Bond energy (kJ/mol) 945 841 498 623

Bond length (pm) 110 112 121 112

6. In each pair, identify all the intermolecular forces present for each substance, and select the

substance with the higher boiling point:

a. MgCl2 or PCl3

b. CH3NH2 or CH3F

c. CH3CH2CH2OH or CH3CH2OCH3

d. C2H6 or C3H8