ch. 5, 11  conversion factors, density, light                    test                          55 points                               chemistry

In problems involving any calculation, show your work in an organized manner, include (i) any relevant equation (or formula), (ii) conversion factor(s), (iii) put the proper units in your calculations and answer, and (iv) have the proper number of significant figures in your answer.

1. A photon of light has a wavelength of 125 micrometers; what is it’s ___ ?  [10 points]

a. Frequency

b.  Energy

2. Describe the basis / rationale of the finite number of “lines” in an atom’s atomic emission spectrum.  [5 points]

3. Density lab analysis:  without a ruler, describe the experimental protocol to find the density of a metal cylinder that fits into a graduated cylinder.  [10 points]
4. A 875 g metal cylinder has a density of 8.0 g / mL and a diameter of 2.0 mm; what is it’s length in meters ?  [10 points]

5. Solve; fill-in the below blank.  [20 points]

a. 275 centimeters =  __ meters

b. 0.25 seconds  =  ___ microseconds

c. 125 milligrams / second  =  ___ grams / minute

d. 125 cm 2 / second =  __ m 2 / hour