Ch. 5  measurement   test                     45 points                                                                      Chem

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. Fill-in the blank; write the number using scientific notation; if it’s in scientific notation, then write “in sci notation”.  [6 points]

a.  127, 000,000  =  ___________________

b.  0.00000277  =  _____________________

c. 127.23 * 103 =  ____________________

2.  Fill-in the blank.  [6 points]

a. 2.00 ÷  3.0  =  _________  (it’s a division problem)

b. 275 * 13  =   ____________

c. 275.17  +  2.6  =  ___________

3. Solve; show your work.  [15 points]

a.  25 mm2 =  _____  cm2

b. 136 seconds =  __ minutes

c.

4.  Solve.  [6 points]

a.  275 K  =  __ ºC

b.  37 ºC = __ K

5. A 125 g cylinder has a density of 12.5 g / mL and a radius of 2.1 mm; what is it’s height in cm ?  [12 points]