Name:  _____________________                              date:  __________________               period: _______

ch. 2, 5, 11 dimmensional analysis, density, light, moles       test      50 points (3 ec)                        honors 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. Solve.  [10 points]

a. 7,325 μm  =  __  cm

b. 125 kg  =  __ mg

c. 3.5 * 1014 nanoseconds  =  ___  minutes

d. 375 feet3  =  __  L

e.

2. Solve.  [8 points]

a. 785 ºC  =  _____ K
b. Write 0.00025 using scientific notation:  ________________________
c. 375.16  +  37.4  = ____________
d. 385.0 *  0.000350  =  ____________

3. Solve.  [10 points]

a. What is the frequency of light with a wavelength of 125 micrometers ?

b. What is the energy of light with a wavelength of 375 millimeters ?

4.  Describe and rationalize the absorption spectrum of the hydrogen atom.  [10 points]

5. Solve.  [15 points]

a. 275 grams of water  =  __ moles of water

b.  2.5 moles of Ca(NO3)2  =  __ g Ca(NO3)2

c.  5.0 trillion carbon dioxide molecules  =  ___  moles of carbon dioxide