ch. 5 & 11  measurement & light                   test   [50 points]          Chemistry

 

Academic Honesty:   The answers on this test are my own and I am using only the allowed set of notes as described in the syllabus.  I have not discussed the test questions with anyone before or during the test nor have I seen the test questions prior to the exam.  If you violate any of the preceding items or do not sign, your semester grade is a F.

 

                                                                                                Signature:  ___________________

 

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

 

1.  A 275 gram solid cylinder has a diameter of 25 cm and a density of 5.8 g / cm3; what is its length in cm ?   [10 points]

 

 

2.  fill-in the blank; pay attention to significant figures.  [10 points]

 

a.  3.000 / 11.0  =  ________

 

b.  0.000103 *  2.030  =  ________

 

c.  125.28  +   28.4  =  _____

 

d.  13720.  =  __________________  (in scientific notation)

 

e.  0.0001080  =  ____________________  (in scientific notation)

 

  3.  Solve; show use of conversion factors, proper units, & # significant figures  [15 points]

 

a.  25 mm2 =  __  m2

 

 

b.  25.0 m / second  =  ___  km / minute

 

 

c.  3,500. mg  =  __  kg

 

 

4.  light; show equations; use of conversion factors, proper units, & # significant figures.  [15 points]

 

a.  if λ = 225 nm, then frequency =  __

 

 

b.  if  f = 775 kHz, then energy =  __.

 

 

c.  if λ = 350. mm, then energy =  __.