South Pasadena Chemistry s1

Chapter 7 Worksheet (Practice)

Formulas and Constants hc E = c =  E = h λ 8 -34 -18 c = 2.998 x 10 m/s h = 6.626 x 10 J·s RH = 2.18 x 10 J  1  h E = R  2  λ = H  n  m

1. The wavelength of the green light from a traffic signal is centered at 522 nm. What is the frequency of this radiation?

2. Convert 8.6 x 1013 Hz to nanometers, and 566nm to Hertz.

3. The blue color of the sky results from the scattering of sunlight by air molecules. The blue light has a frequency of about 7.5 x 1014 Hz.

(a) Calculate the wavelength in nm associated with this radiation

(b) Calculate the energy, in joules of a single photon associated wit this frequency. 4. What is the de Broglie wavelength of a 12.4-g hummingbird flying at 1.20 x 102 mph?

5. Calculate the wavelength (in nanometers) of a photon emitted by a hydrogen atom when its electron drops from the n = 5 to the n = 3 state.

6. Indicate which of the following sets of quantum numbers are incorrect, and why.

(a) (1, 0, 1/2, -1/2)

(b) (3, 0, 0, +1/2)

(c) (3, 2, 1, 1)

7. Write the electron configurations for the atom and the ion it forms.

(c) Fe

(d) Cl